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TDA8932 digital power amplifier board module 35W mono power amplifier module high power and low power consumption
product description:
This board uses high-performance TDA8932 digital power amplifier chip, with small size, high efficiency, high power, and the peak value can reach 35W. The sound quality is good, no need to install an additional radiator. Adopting a mono BTL circuit structure, the output is very suitable for application fields such as active speaker transformation, electroacoustic engineering implementation, and sound product research and development.
Working voltage: DC 10~30V
Output power: 35W
It is recommended to use 24V voltage output 2A power supply
Recommended speaker impedance: 8Ω is the best (4Ω 6Ω can also be used)

18650 lithium battery digital display dual USB output charging board
No technical support, beginners buy carefully! ! !
Feature:
This is a mobile power module accessory, 18650 circuit board shell. Meet your DIY individual needs, but you must know basic electronics assembly. The main board comes with protection functions: charging overcharge protection, over-discharge protection, over-current protection. When the smart output device is fully charged, it will automatically stop charging to prevent the phone from being overcharged. The stability of output voltage and current will not harm user equipment.
Product Specifications:
Micro USB input: 5V 1A
USB output: 5V 2.1A / 5V 1A (dual USB interface)
Charging display: intelligent digital display
Battery Type: Liquid Lithium-Ion (18650)
Product size: 57mm dotˉx28mm
Screen size: 27mm x 17mm
Installation Notes:
The circuit board is connected to the battery negative B-, B is positive, do not connect reverse, twist the connection to burn the board, connect the batteries in parallel to solder, assemble the battery. Please pay attention to the insulation between the battery and the circuit board, and the battery leads do not touch the circuit board, so as not to cause a short circuit.
Package Included:
1 power bank 18650 battery charger circuit board

XH-M601 battery charging control board 12V intelligent charger power control panel automatic charging power
Product Introduction:
1.Name:12V charger power control board
2.Model:XH-M601
3.Power Supply Voltage:13.8-14.8V
4.Relay Operating Voltage:12.4V
5.Relay Disconnect Voltage:14.8V
6.Voltage Tolerance: /-0.1V
7.Voltage Detection Way:DC voltmeter
8.Charging Type:12V storage battery
9.Potentiometer Adjustment:RP1 RP2
10.Size:50*32*18mm
Potentiometer Adjustment:
1.RP1:adjust
storage battery start charging voltage (low voltage setting:clockwise
becomes higher,counter-clockwise becomes lower)
2.RP2:adjust storage
battery disconnect charging voltage (low voltage setting:clockwise
becomes higher,counter-clockwise becomes lower)
Package Included:
1PCS x XH-M601

GY-213V-HTU21D power supply voltage: 3.3V
GY-213V-HDC1080 supply voltage: 3-5V
The main chip of the product is GY-213V-HDC1080 and GY-213V-HTU21D (the same sensor can be made with SHT21 SI7021 chip). This I2C digital humidity sensor is quite accurate and intelligent instead of simpler humidity and temperature sensor-SHT15 circuit breaker , Its typical accuracy is ±4% , and the working range is optimized from 10% to 80% RH. Operations outside this range are still possible, but the accuracy may be reduced a bit. The typical accuracy of temperature output is -20—85°C±0.2°C.
The sensor chip has 2 address selection pins, so up to 4 can be shared on a single I2C bus. It is also 3-5V power supply and logic safe, so you don't need any level shifter or voltage regulator to use with 5V or 3V microcontrollers.
It is a digital humidity sensor with an integrated temperature sensor, which provides excellent measurement accuracy at very low power consumption. HDC1080 operates in a wide range of supply and is a low-cost, low-power alternative that can be used for competitive solutions in a variety of common applications. Humidity and temperature sensors are calibrated at the factory.
Relative humidity accuracy ±2% (typical value)
Temperature accuracy ±0.2°C (typical value)
Good stability under high humidity
14-bit measurement resolution
100 nA sleep mode current

GY-213V-HTU21D power supply voltage: 3.3V
GY-213V-HDC1080 supply voltage: 3-5V
The main chip of the product is GY-213V-HDC1080 and GY-213V-HTU21D (the same sensor can be made with SHT21 SI7021 chip). This I2C digital humidity sensor is quite accurate and intelligent instead of simpler humidity and temperature sensor-SHT15 circuit breaker , Its typical accuracy is ±4% , and the working range is optimized from 10% to 80% RH. Operations outside this range are still possible, but the accuracy may be reduced a bit. The typical accuracy of temperature output is -20—85°C±0.2°C.
The sensor chip has 2 address selection pins, so up to 4 can be shared on a single I2C bus. It is also 3-5V power supply and logic safe, so you don't need any level shifter or voltage regulator to use with 5V or 3V microcontrollers.
It is a digital humidity sensor with an integrated temperature sensor, which provides excellent measurement accuracy at very low power consumption. HDC1080 operates in a wide range of supply and is a low-cost, low-power alternative that can be used for competitive solutions in a variety of common applications. Humidity and temperature sensors are calibrated at the factory.
Relative humidity accuracy ±2% (typical value)
Temperature accuracy ±0.2°C (typical value)
Good stability under high humidity
14-bit measurement resolution
100 nA sleep mode current

Package A Shipping List:
1*Base
3*Lid (common, GPIO, camera)
1*Short camera cable
4*rubber feet
Package B Shipping List:
1*Base
3*Lid (common, GPIO, camera)
1*Short camera cable
2*Long cable
4*rubber feet

Package A Shipping List:
1*Base
3*Lid (common, GPIO, camera)
1*Short camera cable
4*rubber feet
Package B Shipping List:
1*Base
3*Lid (common, GPIO, camera)
1*Short camera cable
2*Long cable
4*rubber feet

Package A Shipping List:
1*Base
3*Lid (common, GPIO, camera)
1*Short camera cable
4*rubber feet
Package B Shipping List:
1*Base
3*Lid (common, GPIO, camera)
1*Short camera cable
2*Long cable
4*rubber feet

Advantages of the upgraded version:
Using the internal high-precision reference and the voltage divider sampling resistance of one thousandth of low temperature drift, the software does multiple filtering processing to greatly improve the accuracy of the acquisition voltage.
Button function description:
Each time the button is pressed, the voltage displayed on the digital tube switches between the input and output voltages. At the same time, the input LED and output indicator LED on the board are also switched.
Press and hold the button for 2 seconds to turn off the digital tube.
Parameter Description:
● Ultra-wide input voltage 3V~32V (the boost below 5V works normally, but the digital tube does not work), the best working voltage range is 5~32V;
● Ultra-wide boost output voltage 5V~40V;
● Built-in 4A high-efficiency MOSFET switch, making the efficiency up to 94% ; (LM2577 current is only 3A)
● The ultra-high switching frequency is 400KHz, which can achieve very good results with small-capacity filter capacitors, with smaller ripple and smaller volume. (LM2577 frequency is only 50KHz)
● With input display indicator and output display indicator, the IN indicator is on when the digital tube displays the input voltage, and the OUT indicator is on when the digital tube displays the output voltage
Wiring Instructions:
IN : Input positive
IN- : Input negative pole
OUT : output positive
OUT- : output negative pole
Other instructions:
The XL6009 is a high-performance boost (BOOST) module with 4A switching current. The module uses the second-generation high-frequency switching technology XL6009E1 as the core chip, and its performance far exceeds the LM2577 of the first-generation technology. The XL6009 boost module has lower cost and higher performance, and the LM2577 module is about to be phased out.
●With terminals, it is easy to use without a soldering iron, and the connection points of the soldering wires are reserved.
●With overheat protection and short circuit protection
●Size 65*39*14mm
●Weight 24g
Technical parameter:
Module nature: non-isolated boost (BOOST)
Rectification method: asynchronous rectification
Input current: 4A, no-load 18mA (5V input, 8V output, no-load less than 18mA. The higher the voltage, the greater the no-load current.)
Conversion efficiency: <94% (the greater the pressure difference, the lower the efficiency)
Switching frequency: 400KHz
Output ripple: 50mV (the higher the voltage, the bigger the current, the bigger the ripple)
Load Regulation: ±0.5%
Voltage regulation rate: ±0.5%
Working temperature: -40℃~ 85℃
Dimensions: 65mm * 39mm * 14mm (L*W*H)
Test comparison sample reference:
Input 5V Output 12V 0.8A 9.6W
Input 7.4V Output 12V 1.5A 18W
Input 12V Output 15V 2A 30W
Input 12V Output 16V 2A 32W
Input 12V Output 18V 1.6A 28.8W
Input 12V Output 19V 1.5A 28.5W
Input 12V Output 24V 1 A 24W
Input 3V Output 12V 0.4A 4.8W

Player Mini is a compact and inexpensive MP3 module that can be directly connected to speakers. The module can be used alone with the power supply battery, speaker, and buttons, or can be controlled through the serial port, as a module of the Ar UNO, or any single-chip microcomputer with a serial port. The module has integrated hard decoding of MP3, WAV, and WMA. At the same time, the software supports TF card drives and supports FAT16 and FAT32 file systems. Through simple serial port commands, you can complete the functions of playing the specified music and how to play the music. There is no need for tedious low-level operations, easy to use, stable and reliable.
Technical specifications
1. Support sampling rate (kHz): 8/11.025/12/16/22.05/24/32/44.1/48
2. 24-bit DAC output, dynamic range support: 90dB, signal-to-noise ratio support: 85dB
3. Fully support FAT16, FAT32 file system, maximum support 32G TF card, support 32G U disk, 64M byte NOR FLASH
4. Multiple control modes are available. IO control mode, serial port mode, AD button control mode
5. Broadcasting language insertion function, you can pause the background music being played. After the ad is played, return to the background sound and continue
6. Audio data is sorted by folder, up to 100 folders are supported, and 255 tracks can be allocated every folder
7, 30 levels of volume adjustable, 6 levels of EQ adjustable
Application
1. Car navigation voice broadcast
2. Voice prompts for road transport inspections and toll stations
3. Voice prompts for safety inspections at railway stations and bus stations
4. Voice prompts for power, communications, and financial business halls
5. Voice prompts for vehicle entry and exit channel verification
6. ** Voice prompt for border inspection channel
7. Multi-channel voice alarm or equipment operation guidance voice
8. Voice notice for safe driving of electric sightseeing vehicles
9. Automatic alarm for mechanical and electrical equipment failure
10. Fire voice alarm prompt
11. Automatic broadcast equipment, regular broadcast
Shipping list
1Pcs Mini MP3 Player Module

Features:
100%  brand new and high quality.
Compatible with Win98/ME/2000/2003/XP/Vista/for Windows 7/for Windows 8.
Compatible with 32-bit and 64-bit computers.
Compatible with all for Mac Operating Systems.
Plug and Play, no extra drivers needed.

Note: PL2303TA supports WIN10, but PL2303HX does not
PL2303HX Module
Features:
1. Using the control chip PL2303HX, it can brush the machine at high speed and stably
2. Set two data transmission indicators to monitor the data transmission status in real-time
3.Reserve 3.3V and 5V pin interfaces to facilitate the flashing of different voltage systems that require a power supply
4. The interface pin header is parallel to the board instead of being installed perpendicular to the board, which is convenient to draw out the Dupont line when brushing the machine
5.The entire circuit board is covered with high-quality transparent heat-shrinkable tubing, so that the PCB circuit is insulated from the outside world. So as to protect the board from being burnt out by an accidental short-circuit of metal. Because of the use of transparent materials, it does not affect the screen printing of the board interface and the monitoring effect of the indicator light.
6. Support WINXP, WIN7, and other systems
Reminder: The connection method of USB-TTL small board and single-chip microcomputer or other products is:
USB-TTL microcontroller
TXD<---->RXD
RXD<---->TXD
GND<---->GND
PL2303HX Cable
Line sequence defined red 5 V, black GND, green RXD, white TXD
Special note:
(A) the connection just to sell a small plate, a tool. We use are not familiar with, they can not provide operational guidance. Many models on the market, and the abilities of each person and far, so we can not be maintained that you can succeed. Not because he did not succeed and give us neutral or negative feedback, then we blame than Dou!
(B) We sent out a tested, to remind buyers do not get directly after the operation, in order to avoid not think there is a problem. First do a simple test is simple: if you put the line plugged into the computer, the computer prompts "Found New Hardware ...." connected (GND) with a multimeter black pen, red pen to pick up (RX) and (TX) voltage can be measured, then the small plates must be good. Special instructions here (GND) to the voltage pins, power must be burned, so user wiring must be accurately measured the pins of the device, so as to avoid unnecessary losses!
Some buyers are not careful burned chip or not operate or machine itself does not support the upgrade, say, our board Please buyers Bypass, thank you. Such a situation does not give return or refund the behavior of not receiving the assessment and Poor.
Note: 3.3V and 5.0V output is set (this is the power supply to the microcontroller, upgrade machines do not need the small plate) unplugged from the computer, set the jumpers to take, do not live to avoid damage to the equipment.
Pin connection and description
The wrong connection be sure to find the pin definitions, especially GND must not be connected to the voltage on the pin, and the RX and TX terminal is not connected to the VCC pin (actual measurement of some VCC pin voltage up to 14V.) shall be burnt adapter cable chip, certain note, do not take their own small plate to experiment, or burn We are not responsible. Must find the pin definitions in the next.
Connection method: repeat Brush only need three lines, generally used in the RX TX GND three signal lines, the VCC without access. The above 4,5 needle friend, not connected to VCC and BT needle. Use RXD connected with the target board TX phase, TXD and target board RX, GND connected to GND if not, swap RX and TX.
Support:Win7,Win8,Vista,XP
PL2303TA Cable
This is a newly designed product, using the Taiwan prolific production company PL2303TA chips,PL2303TA perfectly compatible with win XP/VISTA/7/8/8.1/10 system
PL2303TA provides a convenient solution for connecting an RS232-like full-duplex asynchronous serial device to any Universal Serial Bus (USB) capable host. PL2303TA highly compatible drivers could simulate the traditional COM port on most operating systems allowing the existing applications based on COM port to easily migrate and be made USB ready without having to rewrite the COM port software application.
By taking advantage of USB bulk transfer mode, large data buffers, and automatic flow control, PL2303TA is capable of achieving higher throughput compared to traditional UART (Universal Asynchronous Receiver Transmitter) ports.When real RS232 signaling is not required, baud rate higher than 115200 bps could be used for even higher performance. The flexible baud rate generator of PL2303TA could be programmed to generate any rate between 75 bps and 6M bps.
PL2303TA is exclusively designed for mobile and embedded solutions in mind, providing a small footprint that could easily fit in to any connectors and handheld devices. With very small power consumption in either operating or suspend mode, PL2303TA is perfect for bus powered operation with plenty of power left for the attached devices. Flexible signal level requirement on the RS232-like serial port side also allows PL2303TA to connect directly to any 3.3V~1.8V range devices.
This product is designed for laboratory, product testing, low-cost MCU communications and other applications, there are four lead,
Red 5 V
Black GND
White RXD
Green TXD
Product Applications:
Single-chip upgrade solution for Legacy RS232 devices to USB interface
USB to RS232 converters/cables/dongles
Healthcare/Medical USB Interface Data Transfer Cable
Personal Infotainment/Media Player Docking USB Interface
Cellular/PDA USB Interface Data Transfer Cable
Serial-over-IP Wireless Solution
USB Barcode/Smart Card Readers
GPS/Navigation USB Interface
Point-of-Sale (POS) Terminals/Printers
PC Docking Station/Port Replicators
Industrial/Instrumentation/Automation Control USB Interface
USB Modem/Wireless/Zigbee USB Interface
Set-Top Box (STB) / Home Gateway USB Interface
BatteryCharger Application
MCU-based devices to USB interface

Note: PL2303TA supports WIN10, but PL2303HX does not
PL2303HX Module
Features:
1. Using the control chip PL2303HX, it can brush the machine at high speed and stably
2. Set two data transmission indicators to monitor the data transmission status in real-time
3.Reserve 3.3V and 5V pin interfaces to facilitate the flashing of different voltage systems that require a power supply
4. The interface pin header is parallel to the board instead of being installed perpendicular to the board, which is convenient to draw out the Dupont line when brushing the machine
5.The entire circuit board is covered with high-quality transparent heat-shrinkable tubing, so that the PCB circuit is insulated from the outside world. So as to protect the board from being burnt out by an accidental short-circuit of metal. Because of the use of transparent materials, it does not affect the screen printing of the board interface and the monitoring effect of the indicator light.
6. Support WINXP, WIN7, and other systems
Reminder: The connection method of USB-TTL small board and single-chip microcomputer or other products is:
USB-TTL microcontroller
TXD<---->RXD
RXD<---->TXD
GND<---->GND
PL2303HX Cable
Line sequence defined red 5 V, black GND, green RXD, white TXD
Special note:
(A) the connection just to sell a small plate, a tool. We use are not familiar with, they can not provide operational guidance. Many models on the market, and the abilities of each person and far, so we can not be maintained that you can succeed. Not because he did not succeed and give us neutral or negative feedback, then we blame than Dou!
(B) We sent out a tested, to remind buyers do not get directly after the operation, in order to avoid not think there is a problem. First do a simple test is simple: if you put the line plugged into the computer, the computer prompts "Found New Hardware ...." connected (GND) with a multimeter black pen, red pen to pick up (RX) and (TX) voltage can be measured, then the small plates must be good. Special instructions here (GND) to the voltage pins, power must be burned, so user wiring must be accurately measured the pins of the device, so as to avoid unnecessary losses!
Some buyers are not careful burned chip or not operate or machine itself does not support the upgrade, say, our board Please buyers Bypass, thank you. Such a situation does not give return or refund the behavior of not receiving the assessment and Poor.
Note: 3.3V and 5.0V output is set (this is the power supply to the microcontroller, upgrade machines do not need the small plate) unplugged from the computer, set the jumpers to take, do not live to avoid damage to the equipment.
Pin connection and description
The wrong connection be sure to find the pin definitions, especially GND must not be connected to the voltage on the pin, and the RX and TX terminal is not connected to the VCC pin (actual measurement of some VCC pin voltage up to 14V.) shall be burnt adapter cable chip, certain note, do not take their own small plate to experiment, or burn We are not responsible. Must find the pin definitions in the next.
Connection method: repeat Brush only need three lines, generally used in the RX TX GND three signal lines, the VCC without access. The above 4,5 needle friend, not connected to VCC and BT needle. Use RXD connected with the target board TX phase, TXD and target board RX, GND connected to GND if not, swap RX and TX.
Support:Win7,Win8,Vista,XP
PL2303TA Cable
This is a newly designed product, using the Taiwan prolific production company PL2303TA chips,PL2303TA perfectly compatible with win XP/VISTA/7/8/8.1/10 system
PL2303TA provides a convenient solution for connecting an RS232-like full-duplex asynchronous serial device to any Universal Serial Bus (USB) capable host. PL2303TA highly compatible drivers could simulate the traditional COM port on most operating systems allowing the existing applications based on COM port to easily migrate and be made USB ready without having to rewrite the COM port software application.
By taking advantage of USB bulk transfer mode, large data buffers, and automatic flow control, PL2303TA is capable of achieving higher throughput compared to traditional UART (Universal Asynchronous Receiver Transmitter) ports.When real RS232 signaling is not required, baud rate higher than 115200 bps could be used for even higher performance. The flexible baud rate generator of PL2303TA could be programmed to generate any rate between 75 bps and 6M bps.
PL2303TA is exclusively designed for mobile and embedded solutions in mind, providing a small footprint that could easily fit in to any connectors and handheld devices. With very small power consumption in either operating or suspend mode, PL2303TA is perfect for bus powered operation with plenty of power left for the attached devices. Flexible signal level requirement on the RS232-like serial port side also allows PL2303TA to connect directly to any 3.3V~1.8V range devices.
This product is designed for laboratory, product testing, low-cost MCU communications and other applications, there are four lead,
Red 5 V
Black GND
White RXD
Green TXD
Product Applications:
Single-chip upgrade solution for Legacy RS232 devices to USB interface
USB to RS232 converters/cables/dongles
Healthcare/Medical USB Interface Data Transfer Cable
Personal Infotainment/Media Player Docking USB Interface
Cellular/PDA USB Interface Data Transfer Cable
Serial-over-IP Wireless Solution
USB Barcode/Smart Card Readers
GPS/Navigation USB Interface
Point-of-Sale (POS) Terminals/Printers
PC Docking Station/Port Replicators
Industrial/Instrumentation/Automation Control USB Interface
USB Modem/Wireless/Zigbee USB Interface
Set-Top Box (STB) / Home Gateway USB Interface
BatteryCharger Application
MCU-based devices to USB interface

Note: PL2303TA supports WIN10, but PL2303HX does not
PL2303HX Module
Features:
1. Using the control chip PL2303HX, it can brush the machine at high speed and stably
2. Set two data transmission indicators to monitor the data transmission status in real-time
3.Reserve 3.3V and 5V pin interfaces to facilitate the flashing of different voltage systems that require a power supply
4. The interface pin header is parallel to the board instead of being installed perpendicular to the board, which is convenient to draw out the Dupont line when brushing the machine
5.The entire circuit board is covered with high-quality transparent heat-shrinkable tubing, so that the PCB circuit is insulated from the outside world. So as to protect the board from being burnt out by an accidental short-circuit of metal. Because of the use of transparent materials, it does not affect the screen printing of the board interface and the monitoring effect of the indicator light.
6. Support WINXP, WIN7, and other systems
Reminder: The connection method of USB-TTL small board and single-chip microcomputer or other products is:
USB-TTL microcontroller
TXD<---->RXD
RXD<---->TXD
GND<---->GND
PL2303HX Cable
Line sequence defined red 5 V, black GND, green RXD, white TXD
Special note:
(A) the connection just to sell a small plate, a tool. We use are not familiar with, they can not provide operational guidance. Many models on the market, and the abilities of each person and far, so we can not be maintained that you can succeed. Not because he did not succeed and give us neutral or negative feedback, then we blame than Dou!
(B) We sent out a tested, to remind buyers do not get directly after the operation, in order to avoid not think there is a problem. First do a simple test is simple: if you put the line plugged into the computer, the computer prompts "Found New Hardware ...." connected (GND) with a multimeter black pen, red pen to pick up (RX) and (TX) voltage can be measured, then the small plates must be good. Special instructions here (GND) to the voltage pins, power must be burned, so user wiring must be accurately measured the pins of the device, so as to avoid unnecessary losses!
Some buyers are not careful burned chip or not operate or machine itself does not support the upgrade, say, our board Please buyers Bypass, thank you. Such a situation does not give return or refund the behavior of not receiving the assessment and Poor.
Note: 3.3V and 5.0V output is set (this is the power supply to the microcontroller, upgrade machines do not need the small plate) unplugged from the computer, set the jumpers to take, do not live to avoid damage to the equipment.
Pin connection and description
The wrong connection be sure to find the pin definitions, especially GND must not be connected to the voltage on the pin, and the RX and TX terminal is not connected to the VCC pin (actual measurement of some VCC pin voltage up to 14V.) shall be burnt adapter cable chip, certain note, do not take their own small plate to experiment, or burn We are not responsible. Must find the pin definitions in the next.
Connection method: repeat Brush only need three lines, generally used in the RX TX GND three signal lines, the VCC without access. The above 4,5 needle friend, not connected to VCC and BT needle. Use RXD connected with the target board TX phase, TXD and target board RX, GND connected to GND if not, swap RX and TX.
Support:Win7,Win8,Vista,XP
PL2303TA Cable
This is a newly designed product, using the Taiwan prolific production company PL2303TA chips,PL2303TA perfectly compatible with win XP/VISTA/7/8/8.1/10 system
PL2303TA provides a convenient solution for connecting an RS232-like full-duplex asynchronous serial device to any Universal Serial Bus (USB) capable host. PL2303TA highly compatible drivers could simulate the traditional COM port on most operating systems allowing the existing applications based on COM port to easily migrate and be made USB ready without having to rewrite the COM port software application.
By taking advantage of USB bulk transfer mode, large data buffers, and automatic flow control, PL2303TA is capable of achieving higher throughput compared to traditional UART (Universal Asynchronous Receiver Transmitter) ports.When real RS232 signaling is not required, baud rate higher than 115200 bps could be used for even higher performance. The flexible baud rate generator of PL2303TA could be programmed to generate any rate between 75 bps and 6M bps.
PL2303TA is exclusively designed for mobile and embedded solutions in mind, providing a small footprint that could easily fit in to any connectors and handheld devices. With very small power consumption in either operating or suspend mode, PL2303TA is perfect for bus powered operation with plenty of power left for the attached devices. Flexible signal level requirement on the RS232-like serial port side also allows PL2303TA to connect directly to any 3.3V~1.8V range devices.
This product is designed for laboratory, product testing, low-cost MCU communications and other applications, there are four lead,
Red 5 V
Black GND
White RXD
Green TXD
Product Applications:
Single-chip upgrade solution for Legacy RS232 devices to USB interface
USB to RS232 converters/cables/dongles
Healthcare/Medical USB Interface Data Transfer Cable
Personal Infotainment/Media Player Docking USB Interface
Cellular/PDA USB Interface Data Transfer Cable
Serial-over-IP Wireless Solution
USB Barcode/Smart Card Readers
GPS/Navigation USB Interface
Point-of-Sale (POS) Terminals/Printers
PC Docking Station/Port Replicators
Industrial/Instrumentation/Automation Control USB Interface
USB Modem/Wireless/Zigbee USB Interface
Set-Top Box (STB) / Home Gateway USB Interface
BatteryCharger Application
MCU-based devices to USB interface

Raspberry Pi 4B case
Material: ABS injection molding
Color: black, white, transparent
Size: 91mm*67mm*25mm
Weight: 31g

Raspberry Pi 4B case
Material: ABS injection molding
Color: black, white, transparent
Size: 91mm*67mm*25mm
Weight: 31g

Raspberry Pi 4B case
Material: ABS injection molding
Color: black, white, transparent
Size: 91mm*67mm*25mm
Weight: 31g

Raspberry Pi 4B case
Material: ABS injection molding
Color: black, white, transparent
Size: 91mm*67mm*25mm
Weight: 31g

Raspberry Pi 4B case
Material: ABS injection molding
Color: black, white, transparent
Size: 91mm*67mm*25mm
Weight: 31g

Raspberry Pi 4B case
Material: ABS injection molding
Color: black, white, transparent
Size: 91mm*67mm*25mm
Weight: 31g

Raspberry Pi 4B case
Material: ABS injection molding
Color: black, white, transparent
Size: 91mm*67mm*25mm
Weight: 31g

Features of this programmer:
1. This downloader supports all STC programming programs of 3.3V and 5V STC and the BSL programming method of MSP430 MCU (only with MspFet software).
2. The highest baud rate 115200 is perfectly supported! No need to worry about the burning of STC12 series, STC11 series and STC15 series!
3. There is no need to power off the MCU frequently, that is, the programmer automatically downloads without a cold start. This function makes the STC MCU download program very convenient. Experienced friends know that you need to manually turn off the STC MCU download process. The action of turning off the power and then turning on the power will become very painful when debugging the program. Our burner does this tedious task for you!
4. Support 3.3V and 5.0V version of STC MCU programming, the downloader integrates a 3.3V power management chip, 3.3 external power supply current is up to 500MA, and there is no need to worry about 3.3V power supply!
5. The programming success rate of the most troublesome STC12, STC15, STC11 series is 100% , and the highest baud rate is 115200! Throw away the PL-2303HX solution in your hand! You know the pain of burning these three series...Don't say you have FT232, what's wrong with the noble chip? We actually compared it and compared the burning speed! The above three series of FT232 are also unmatched at the highest baud rate of 115200! CP2102 is going to die even more! Too lazy to mention it again! This programmer uses CH340 single-chip microcomputer to control the core to kill all STC high-speed programming.
6.500MA self-recovery fuse, perfect protection for your delicate computer motherboard! Don't lose big because of small! The sad reminder of Taoyou who burned the USB port, he knows it himself, and you also have to understand... Don't let yourself regret it...
7. Metal aluminum shell protects the main board of the burner! Never be afraid that there is a metal object on the desktop to short-circuit your burner! Feel free to use, not afraid of falling or crushing! The most important thing is the two words-grade (laser laser)
8. The interface definition is printed on the shell, so don't worry about not knowing the interface definition! What instructions do you want, we have it on the shell!
9. A variety of colors are available, generally shipped randomly, if you need to choose the color, please confirm with the shopkeeper whether the color you want is in stock!
10. Support WIN7 system, compatible with all the following systems, support 64-bit system
STC programming requires only four pins (for example, connect to STC89C52 single-chip microcomputer):
5V0 connect to VCC TXD connect to P3.0 RXD connect to P3.1 GND connect to GND
With status indicator, it will flash when there is data transmission, and it will always be on when there is no data transmission.
This programmer also supports various occasions that require USB-TTL serial port signals, such as serial communication, super terminal serial debugging tools, and other similar MCU download programs, flashing hard disks or set-top boxes, MSP430 MCU programming, etc. The technical support service is not prompted for the time being, please use it yourself.

4 series 16.8V40A lithium battery protection board
Scope of application: suitable for lithium batteries with a nominal voltage of 3.7V and a full voltage of 4.2V
(Including 18650, 26650, polymer lithium battery, there is no restriction on external dimensions)
Product size: 45*55*3.4mm (enhanced version), 45*60*3.4mm (balanced version)
Product weight: 9.3g (enhanced version), 10..3g (balanced version)
Charging voltage: 16.8V~18.1V
Continuous discharge current (upper limit): 40A (If the heat dissipation environment is not good, please reduce the load current to use)
Continuous charging current (upper limit): 20A
Enhanced version: suitable for electric drills with starting current below 80A and power below 230W.
Balanced version: suitable for electric drills with starting current below 80A and power below 230, with equalizing charging function.
Note 1: Successful start of the electric drill requires 4 10C-20C power batteries, or 8 5C-10C power batteries (recommended power battery models: SONY VTC4, VTC4A, VTC5A, VTC6), 0V and 12.6V connection lines, use Wires of more than 3 square millimeters (nickel sheets cannot be used!).
Note 2: Wiring 0V, 4.2V, 8.4V, 12.6V strictly according to the diagram, and do not touch any components on the board when welding the wire, and do not intentionally short-circuit.
Note 3: When the battery is being welded for the first time or is being charged, as long as a single battery exceeds 4.2V, the "430" resistor will heat up and discharge (discharge to about 4.19V to stop heating). If the "430" resistor is seriously hot (you can't touch it when it is too hot), please check whether it is connected to the wrong wire.
Conditions for successfully starting the electric drill:
1. 4 power batteries of 15C-20C or 8 power batteries of 10C-15C are required. (Ordinary 18650 can't start the electric drill!!)
2, 0V and 16.8V connecting wire, use copper wire of more than 3 square millimeters, the shorter the better.

4 series 16.8V40A lithium battery protection board
Scope of application: suitable for lithium batteries with a nominal voltage of 3.7V and a full voltage of 4.2V
(Including 18650, 26650, polymer lithium battery, there is no restriction on external dimensions)
Product size: 45*55*3.4mm (enhanced version), 45*60*3.4mm (balanced version)
Product weight: 9.3g (enhanced version), 10..3g (balanced version)
Charging voltage: 16.8V~18.1V
Continuous discharge current (upper limit): 40A (If the heat dissipation environment is not good, please reduce the load current to use)
Continuous charging current (upper limit): 20A
Enhanced version: suitable for electric drills with starting current below 80A and power below 230W.
Balanced version: suitable for electric drills with starting current below 80A and power below 230, with equalizing charging function.
Note 1: Successful start of the electric drill requires 4 10C-20C power batteries, or 8 5C-10C power batteries (recommended power battery models: SONY VTC4, VTC4A, VTC5A, VTC6), 0V and 12.6V connection lines, use Wires of more than 3 square millimeters (nickel sheets cannot be used!).
Note 2: Wiring 0V, 4.2V, 8.4V, 12.6V strictly according to the diagram, and do not touch any components on the board when welding the wire, and do not intentionally short-circuit.
Note 3: When the battery is being welded for the first time or is being charged, as long as a single battery exceeds 4.2V, the "430" resistor will heat up and discharge (discharge to about 4.19V to stop heating). If the "430" resistor is seriously hot (you can't touch it when it is too hot), please check whether it is connected to the wrong wire.
Conditions for successfully starting the electric drill:
1. 4 power batteries of 15C-20C or 8 power batteries of 10C-15C are required. (Ordinary 18650 can't start the electric drill!!)
2, 0V and 16.8V connecting wire, use copper wire of more than 3 square millimeters, the shorter the better.

50CM RGB soft light strip description
Light strip specifications: 50CM/15 lights and 50CM/30 lights, 3 lights as a group, 12V power supply, can be cascaded arbitrarily.
1. The maximum power of a single lamp bead is 0.3W, the maximum power of the 50CM/15 lamp specification is 4.5W, and the maximum power of the 50CM/30 lamp specification is 9W. more than 12V, otherwise the lamp beads will be burned).
2. The light strip can be programmed and controlled by the single-chip arduino, or it can be controlled by other single-chip microcomputers (STC 51 single-chip microcomputer, STM32, etc.), or use the common RGB controllers on the market. The pro of the program can be found online (search for arduino to control WS2811 light strip, WS2811 routine).
Baby description:
1. Product model: 12V-RGB-15 light strip, 12V-RGB-30 light strip
2. Light source: SMD 5050 LED;
3. Plate: FPCB;
4. Chip: Taiwan Epistar chip;
5. IC model: WS2811, (0.5m 5 ICs or 0.5m 10 ICs, 1 IC controls 3 LED lights);
6. Gray scale: 256 levels, (0.5m 15 pixels / 0.5m 30 pixels);
7. LED quantity: 15 lights/50CM & 30 lights/50CM, every 3 lights is a group, which can be cut;
8. Lighting angle: 120°;
9. Lighting color: can be adjusted to white, red, yellow, blue, green, etc. through the controller;
10. Standard working voltage: DC 12V;
11. Power: 4.5W/5W±10% /0.5m;
12. Waterproof grade: bare board is not waterproof;
13. Dimensions of FPCB board: width: 10mm, thickness: 0.3mm;

50CM RGB soft light strip description
Light strip specifications: 50CM/15 lights and 50CM/30 lights, 3 lights as a group, 12V power supply, can be cascaded arbitrarily.
1. The maximum power of a single lamp bead is 0.3W, the maximum power of the 50CM/15 lamp specification is 4.5W, and the maximum power of the 50CM/30 lamp specification is 9W. more than 12V, otherwise the lamp beads will be burned).
2. The light strip can be programmed and controlled by the single-chip arduino, or it can be controlled by other single-chip microcomputers (STC 51 single-chip microcomputer, STM32, etc.), or use the common RGB controllers on the market. The pro of the program can be found online (search for arduino to control WS2811 light strip, WS2811 routine).
Baby description:
1. Product model: 12V-RGB-15 light strip, 12V-RGB-30 light strip
2. Light source: SMD 5050 LED;
3. Plate: FPCB;
4. Chip: Taiwan Epistar chip;
5. IC model: WS2811, (0.5m 5 ICs or 0.5m 10 ICs, 1 IC controls 3 LED lights);
6. Gray scale: 256 levels, (0.5m 15 pixels / 0.5m 30 pixels);
7. LED quantity: 15 lights/50CM & 30 lights/50CM, every 3 lights is a group, which can be cut;
8. Lighting angle: 120°;
9. Lighting color: can be adjusted to white, red, yellow, blue, green, etc. through the controller;
10. Standard working voltage: DC 12V;
11. Power: 4.5W/5W±10% /0.5m;
12. Waterproof grade: bare board is not waterproof;
13. Dimensions of FPCB board: width: 10mm, thickness: 0.3mm;

Product description:
1. can detect the humidity and temperature of the surrounding environment
2. sensors using DHT11
3.Humidity measurement range: 20% RH~95% RH (0℃~50℃ range) Humidity measurement error: ±5%
4.Temperature measurement range: 0℃~50℃, Temperature measurement error: ±2℃
5. working voltage 3.3V~5V
6. output from a digital output
7. with fixing bolt holes for easy installation
8. small board PCB size:3.2cm*1.4cm
9. power indicator (Red)
10. sets of weight are about 8g
Module interface description (3-wire system)
1. VCC external 3.3V-5V
2. GND external GND
3. DO small board switch digital output interface

Product Introduction
The vertical MICRO USB female socket has a test adapter board, which can be directly tested when you buy it by hand welding, which is convenient and fast, and saves a lot of welding troubles!
Product parameter
Product name: Vertical MICRO USB female adapter board
Size: 11*16*1.6mm
Process: double-sided immersion gold plate process
Pin spacing: 2.54mm
PCB diagram
Note: There are errors in manual measurement, please refer to the actual product

FT232BL USB to serial port module USB to TTL level
【Hardware Introduction】
·Use FTDI's industrial-grade chip FT232BL production, chip operating temperature range: -40 ℃ ~ 85 ℃,
· Lead out all signal ports of FT232BL chip, TTL/CMOS level;
·RXD/TXD transceiver communication indicator;
·USB power supply, optional 5V or 3.3V interface level (if other levels are needed, you can directly provide the target voltage on the VCC and GND pins).
·The six pins are defined as: GND VCC CTS TX RX DTR
·PCB board size: 17mm*32.5mm
【Introduction of FT232B】
With the development of computer technology, parallel ports and serial ports have slowly disappeared on PCs. Nowadays, even desktop computers have few parallel ports. But for engineers, both parallel and serial ports are essential interfaces, especially serial ports. For computers without a serial port, the most convenient solution is to use a USB to serial chip to virtualize a serial port. From a stability perspective, the FT232 series is the most reliable. You can use it to debug programs without worrying about the blue screen. appear.

Technical parameter:
1. Humidity measurement range: 0~100% RH
2. Humidity measurement accuracy: ±3% RH;
3. Temperature measurement range: -40~125℃
4. Temperature measurement accuracy: ±0.3℃
5. Working voltage: 2.2~5.5VDC (wide voltage)
6. I2C interface output
7. Size: 17MM*12MM
★ Full temperature and humidity range calibration and temperature compensation digital output
★ I2C interface, communication speed up to 1MHz
★ Two user selectable addresses
★ Single chip integrated temperature and humidity sensor
★ High reliability and long-term stability
★ Integrated 16-bit high-precision ADC
★ Measuring time as low as 2.5ms

CP2102 module USB TO TTL USB to serial port module UART STC downloader
Little common sense (very important):
TXD: Transmitting terminal, generally expressed as its own transmitting terminal. Normal communication must be connected to the RXD of another device.
RXD: Receiving end, generally expressed as its own receiving end, normal communication must be connected to the TXD of another device.
During normal communication, the TXD of the device is always connected to the RXD of the device!
Self-receiving and self-transmitting: RXD is connected to the TXD of other devices during normal communication, so if you want to receive the data sent by yourself, as the name suggests, that is, you receive the data sent by yourself, that is, your own TXD is directly connected to RXD to test its own transmission and reception Whether it is normal or not is a quick and simple test method. When a problem occurs, the first test is performed to determine whether the product is faulty. Also called loopback test.
Level logic:
TTL level: Usually data is expressed in binary, and it is stipulated that 5V is equivalent to logic "1", and 0V is equivalent to logic "0", which is called TTL signal system, which is positive logic
RS232 level: use -12V to -3V, which is equivalent to logic "0", 3V to 12V logic level, which is equivalent to logic "1", which is negative logic
Product manual:
1. The main chip is CP2102, and a virtual serial port is generated after installing the driver
2. USB power supply, the output interface includes 3.3V (<40mA), 5V, GND, TX, RX, the signal pin level is 3.3V, positive logic
3. On-board status indicator, transceiver indicator, the status indicator will always be on after the driver is installed correctly, the transceiver indicator will flash during communication, the higher the baud rate, the lower the brightness
4. Support baud rate from 300bps to 1Mbps
5. Communication format support: 1) 5, 6, 7, 8 data bits; 2) support 1, 1.5, 2 stop bits; 3) odd, even, mark, space, none check
6. Support operating system: windows vista/xp/server 2003/200, Mac OS-X/OS-9, Linux
7. The USB head is male, which can be directly connected to the computer USB port
8. SMD components are produced by SMT process with stable quality

CP2102 module USB TO TTL USB to serial port module UART STC downloader
Little common sense (very important):
TXD: Transmitting terminal, generally expressed as its own transmitting terminal. Normal communication must be connected to the RXD of another device.
RXD: Receiving end, generally expressed as its own receiving end, normal communication must be connected to the TXD of another device.
During normal communication, the TXD of the device is always connected to the RXD of the device!
Self-receiving and self-transmitting: RXD is connected to the TXD of other devices during normal communication, so if you want to receive the data sent by yourself, as the name suggests, that is, you receive the data sent by yourself, that is, your own TXD is directly connected to RXD to test its own transmission and reception Whether it is normal or not is a quick and simple test method. When a problem occurs, the first test is performed to determine whether the product is faulty. Also called loopback test.
Level logic:
TTL level: Usually data is expressed in binary, and it is stipulated that 5V is equivalent to logic "1", and 0V is equivalent to logic "0", which is called TTL signal system, which is positive logic
RS232 level: use -12V to -3V, which is equivalent to logic "0", 3V to 12V logic level, which is equivalent to logic "1", which is negative logic
Product manual:
1. The main chip is CP2102, and a virtual serial port is generated after installing the driver
2. USB power supply, the output interface includes 3.3V (<40mA), 5V, GND, TX, RX, the signal pin level is 3.3V, positive logic
3. On-board status indicator, transceiver indicator, the status indicator will always be on after the driver is installed correctly, the transceiver indicator will flash during communication, the higher the baud rate, the lower the brightness
4. Support baud rate from 300bps to 1Mbps
5. Communication format support: 1) 5, 6, 7, 8 data bits; 2) support 1, 1.5, 2 stop bits; 3) odd, even, mark, space, none check
6. Support operating system: windows vista/xp/server 2003/200, Mac OS-X/OS-9, Linux
7. The USB head is male, which can be directly connected to the computer USB port
8. SMD components are produced by SMT process with stable quality

Reminder: The M28 version is connected to the audio output of the power amplifier board, earphones, active speakers, etc., and the M38 version can only be connected to two 3-5W speakers!
New product version 5.0! Backward compatible with 4.2 4.1 4.0
Product introduction:
This product MH-M28/M38 is a low-power Bluetooth design scheme, supports the latest Bluetooth 5.0 transmission, two-channel stereo lossless playback, after the module is connected to Bluetooth, Bluetooth wireless transmission can be quickly realized, which is very convenient. In an open environment, the Bluetooth connection distance can reach up to 20 meters.
It is widely used in various Bluetooth audio receivers, various audio DIY modification, etc.
For the different needs of customers, we provide 2 versions for you to choose:
1. Bluetooth V5.0 version, support Bluetooth automatic connection technology, support WAV/WMA/FLAC/APE/MP3 lossless decoding, stereo dual-channel output.
2. After the module is powered on, the mobile phone searches for the Bluetooth name MH-M28/MH-M38, and it can play music after connecting to the Bluetooth;
3. Module blue indicator light:
When Bluetooth is not connected, the indicator light flashes quickly;
When the Bluetooth is connected, the indicator light is always on;
When Bluetooth is playing, the indicator light flashes slowly.
M18:
The module interface adopts a half-hole process, and customers can directly mount or weld on the board.
Pin description:
KEY》button control terminal (4 button functions, additional resistance is required
MUTE "Mute control terminal (output high level 3.3V when mute, output low level when playing)
VCC》Power supply positive 5V (Lithium battery 3.7V power supply requires short-circuit diode)
GND》power supply negative
L》Left channel output
R "channel output
M28:
Pin description:
5V》Power supply positive 5V
GND》power supply negative
VBAT》Lithium battery anode 3.7-4.2V
L》Left channel output
R "right channel output
AGND》audio ground
1. Power supply: You can directly use the MICRO USB Android cable 5V for power supply, or you can also connect to a 5V power supply or a 3.7V lithium battery. Note that the 5V and 3.7V power supply interfaces are different. The 5V voltage is connected to 5V and GND, and the 3.7V lithium battery is connected to VBAT and GND.
2. Audio output: The earphone can be directly connected to the 3.5mm audio interface, or it can be wired for the audio input of the power amplifier board (L/R/AGND shown on the circuit board can be directly wired).
M38:
Pin description:
5V》Power supply positive 5V
GND》power supply negative
VBAT》Lithium battery anode 3.7-4.2V
L》Left channel output (directly connected to the speaker)
R》Right channel output (directly connected to the speaker)
1. Power supply: You can directly use the MICRO USB Android cable 5V for power supply, or you can also connect to a 5V power supply or a 3.7V lithium battery. Note that the power supply interface of 5V and 3.7V is different, 5V is connected to 5V and GND, and 3.7V lithium battery is connected to VBAT and GND.
The maximum working current is 5V2A. It is recommended to use a 5V2A regulated power supply for better sound quality.
2. Support USB sound card, free drive (plug and play). Connect the module to the computer with a USB data cable, and the computer can play music and output through the module's amplifier
3. Audio output: output left and right channel stereo audio signals, which can be connected to two 2-8 ohm and 3-5W speakers respectively, and 4 ohm 5W speakers are recommended for storage.
4. This product has built-in dual 5W power amplifier circuit, it must not be used with another power amplifier! The outputs of the two power amplifiers cannot be connected in parallel or the negative poles connected together, otherwise the power amplifier chip will be damaged.

Reminder: The M28 version is connected to the audio output of the power amplifier board, earphones, active speakers, etc., and the M38 version can only be connected to two 3-5W speakers!
New product version 5.0! Backward compatible with 4.2 4.1 4.0
Product introduction:
This product MH-M28/M38 is a low-power Bluetooth design scheme, supports the latest Bluetooth 5.0 transmission, two-channel stereo lossless playback, after the module is connected to Bluetooth, Bluetooth wireless transmission can be quickly realized, which is very convenient. In an open environment, the Bluetooth connection distance can reach up to 20 meters.
It is widely used in various Bluetooth audio receivers, various audio DIY modification, etc.
For the different needs of customers, we provide 2 versions for you to choose:
1. Bluetooth V5.0 version, support Bluetooth automatic connection technology, support WAV/WMA/FLAC/APE/MP3 lossless decoding, stereo dual-channel output.
2. After the module is powered on, the mobile phone searches for the Bluetooth name MH-M28/MH-M38, and it can play music after connecting to the Bluetooth;
3. Module blue indicator light:
When Bluetooth is not connected, the indicator light flashes quickly;
When the Bluetooth is connected, the indicator light is always on;
When Bluetooth is playing, the indicator light flashes slowly.
M18:
The module interface adopts a half-hole process, and customers can directly mount or weld on the board.
Pin description:
KEY》button control terminal (4 button functions, additional resistance is required
MUTE "Mute control terminal (output high level 3.3V when mute, output low level when playing)
VCC》Power supply positive 5V (Lithium battery 3.7V power supply requires short-circuit diode)
GND》power supply negative
L》Left channel output
R "channel output
M28:
Pin description:
5V》Power supply positive 5V
GND》power supply negative
VBAT》Lithium battery anode 3.7-4.2V
L》Left channel output
R "right channel output
AGND》audio ground
1. Power supply: You can directly use the MICRO USB Android cable 5V for power supply, or you can also connect to a 5V power supply or a 3.7V lithium battery. Note that the 5V and 3.7V power supply interfaces are different. The 5V voltage is connected to 5V and GND, and the 3.7V lithium battery is connected to VBAT and GND.
2. Audio output: The earphone can be directly connected to the 3.5mm audio interface, or it can be wired for the audio input of the power amplifier board (L/R/AGND shown on the circuit board can be directly wired).
M38:
Pin description:
5V》Power supply positive 5V
GND》power supply negative
VBAT》Lithium battery anode 3.7-4.2V
L》Left channel output (directly connected to the speaker)
R》Right channel output (directly connected to the speaker)
1. Power supply: You can directly use the MICRO USB Android cable 5V for power supply, or you can also connect to a 5V power supply or a 3.7V lithium battery. Note that the power supply interface of 5V and 3.7V is different, 5V is connected to 5V and GND, and 3.7V lithium battery is connected to VBAT and GND.
The maximum working current is 5V2A. It is recommended to use a 5V2A regulated power supply for better sound quality.
2. Support USB sound card, free drive (plug and play). Connect the module to the computer with a USB data cable, and the computer can play music and output through the module's amplifier
3. Audio output: output left and right channel stereo audio signals, which can be connected to two 2-8 ohm and 3-5W speakers respectively, and 4 ohm 5W speakers are recommended for storage.
4. This product has built-in dual 5W power amplifier circuit, it must not be used with another power amplifier! The outputs of the two power amplifiers cannot be connected in parallel or the negative poles connected together, otherwise the power amplifier chip will be damaged.

Reminder: The M28 version is connected to the audio output of the power amplifier board, earphones, active speakers, etc., and the M38 version can only be connected to two 3-5W speakers!
New product version 5.0! Backward compatible with 4.2 4.1 4.0
Product introduction:
This product MH-M28/M38 is a low-power Bluetooth design scheme, supports the latest Bluetooth 5.0 transmission, two-channel stereo lossless playback, after the module is connected to Bluetooth, Bluetooth wireless transmission can be quickly realized, which is very convenient. In an open environment, the Bluetooth connection distance can reach up to 20 meters.
It is widely used in various Bluetooth audio receivers, various audio DIY modification, etc.
For the different needs of customers, we provide 2 versions for you to choose:
1. Bluetooth V5.0 version, support Bluetooth automatic connection technology, support WAV/WMA/FLAC/APE/MP3 lossless decoding, stereo dual-channel output.
2. After the module is powered on, the mobile phone searches for the Bluetooth name MH-M28/MH-M38, and it can play music after connecting to the Bluetooth;
3. Module blue indicator light:
When Bluetooth is not connected, the indicator light flashes quickly;
When the Bluetooth is connected, the indicator light is always on;
When Bluetooth is playing, the indicator light flashes slowly.
M18:
The module interface adopts a half-hole process, and customers can directly mount or weld on the board.
Pin description:
KEY》button control terminal (4 button functions, additional resistance is required
MUTE "Mute control terminal (output high level 3.3V when mute, output low level when playing)
VCC》Power supply positive 5V (Lithium battery 3.7V power supply requires short-circuit diode)
GND》power supply negative
L》Left channel output
R "channel output
M28:
Pin description:
5V》Power supply positive 5V
GND》power supply negative
VBAT》Lithium battery anode 3.7-4.2V
L》Left channel output
R "right channel output
AGND》audio ground
1. Power supply: You can directly use the MICRO USB Android cable 5V for power supply, or you can also connect to a 5V power supply or a 3.7V lithium battery. Note that the 5V and 3.7V power supply interfaces are different. The 5V voltage is connected to 5V and GND, and the 3.7V lithium battery is connected to VBAT and GND.
2. Audio output: The earphone can be directly connected to the 3.5mm audio interface, or it can be wired for the audio input of the power amplifier board (L/R/AGND shown on the circuit board can be directly wired).
M38:
Pin description:
5V》Power supply positive 5V
GND》power supply negative
VBAT》Lithium battery anode 3.7-4.2V
L》Left channel output (directly connected to the speaker)
R》Right channel output (directly connected to the speaker)
1. Power supply: You can directly use the MICRO USB Android cable 5V for power supply, or you can also connect to a 5V power supply or a 3.7V lithium battery. Note that the power supply interface of 5V and 3.7V is different, 5V is connected to 5V and GND, and 3.7V lithium battery is connected to VBAT and GND.
The maximum working current is 5V2A. It is recommended to use a 5V2A regulated power supply for better sound quality.
2. Support USB sound card, free drive (plug and play). Connect the module to the computer with a USB data cable, and the computer can play music and output through the module's amplifier
3. Audio output: output left and right channel stereo audio signals, which can be connected to two 2-8 ohm and 3-5W speakers respectively, and 4 ohm 5W speakers are recommended for storage.
4. This product has built-in dual 5W power amplifier circuit, it must not be used with another power amplifier! The outputs of the two power amplifiers cannot be connected in parallel or the negative poles connected together, otherwise the power amplifier chip will be damaged.

Application areas:
DC-DC step-down module for airplane model (support 2S~5S polymer lithium battery), DIY mobile power supply, vehicle power supply, communication equipment power supply, various occasions that have strict requirements on volume and weight.
Technical Parameters:
Model

Mini360(ultra-small DC-DC synchronous rectifier step-down module)
Module nature

Non-isolated buck
Rectification method

Synchronous rectification
Input voltage

4.75V~23V
Output voltage

1.0V~17V
Output current

Peak3A,long time1.8A
Conversion efficiency

96% (maximum)
Switching frequency

340KHz
Output ripple

30mV(when no load)
Load regulation rate

±0.5%
Voltage Regulation

±2.5%
Operating temperature

-40℃ ~ 85℃
Size

17*11*3.8mm
Features: It uses one-piece power inductor and synchronous rectification control chip, which is smaller in size and higher in efficiency.

Application areas:
DC-DC step-down module for airplane model (support 2S~5S polymer lithium battery), DIY mobile power supply, vehicle power supply, communication equipment power supply, various occasions that have strict requirements on volume and weight.
Technical Parameters:
Model

Mini360(ultra-small DC-DC synchronous rectifier step-down module)
Module nature

Non-isolated buck
Rectification method

Synchronous rectification
Input voltage

4.75V~23V
Output voltage

1.0V~17V
Output current

Peak3A,long time1.8A
Conversion efficiency

96% (maximum)
Switching frequency

340KHz
Output ripple

30mV(when no load)
Load regulation rate

±0.5%
Voltage Regulation

±2.5%
Operating temperature

-40℃ ~ 85℃
Size

17*11*3.8mm
Features: It uses one-piece power inductor and synchronous rectification control chip, which is smaller in size and higher in efficiency.