Kereskedelmi, irodai és ipari

Product introduction:
This product is based on the PAJ7620U2 gesture recognition sensor, which can recognize gestures in 9 different directions, including up, down, left, right, front, back, clockwise, counterclockwise, and swing. The gesture recognition module uses the II2C interface and can be programmed and controlled by using the corresponding arduino library functions. The signal returned by the gesture recognition module can be used as the control signal received by the robot, so as to realize the control of the robot. The built-in recognition algorithm is quite capable, freeing both hands from stiff buttons. Gesture recognition sensors can be used in contactless control scenarios such as contactless mouse, smart home, car click device control, robot interaction, etc.
Product Features:
1. 9 kinds of gesture recognition
2. Interface: IIC interface communication protocol
3. Working voltage: 3.3V~5.0V
4. The gesture speed is 60°/S~600°/s in normal mode and 60°/S~1200°/s in game mode
5. Ambient light immunity: <100K Lux
6. Working current: 3mA~10mA
7. Module size: 14mm*14mm
Interface definition:
1.GND: negative power input port
2. VCC: positive power input port
3. SCL: I2C clock port
4. SDA: I2C data port
5. INT: Interrupt output
Wiring port distance: 2.54mm (circular distance between two holes)

Introduction to MQ-8 sensor:
The gas-sensitive material used in the MQ-8 gas sensor is tin dioxide (SnO2) with low conductivity in clean air. When there is combustible gas in the environment where the sensor is located, the conductivity of the sensor increases with the increase of the combustible gas concentration in the air. Using a simple circuit, the change in conductivity can be converted into an output signal corresponding to the gas concentration. The MQ-8 gas sensor has a high sensitivity to hydrogen and is ideal for monitoring other hydrogen-containing gases. This sensor can detect a variety of hydrogen-containing gases, especially city gas, and is a low-cost sensor suitable for a variety of applications.
Module application:
It is suitable for monitoring devices for hydrogen leakage in households or industries. It is not interfered with by ethanol vapor, oil fume, carbon monoxide, and other gases.
Module features:
1. Adopt high-quality double-panel design, with power indication and TTL signal output indication;
2. With doing switch signal (TTL) output and AO analog signal output;
3. TTL output valid signal is low level. (The signal light is on when the output is low, and it can be directly connected to the single-chip microcomputer or relay module)
4. The voltage of analog output, the higher the concentration, the higher the voltage.
5. It has good sensitivity for hydrogen detection.
6. There are four screw holes for easy positioning;
7. Product dimensions: 32(L)*20(W)*22(H)
8. It has a long service life and reliable stability
9. Fast response and recovery characteristics
Electrical performance:
Input voltage: DC5V Power consumption (current): 150mA
DO output: TTL digital quantity 0 and 1 (0.1 and 5V)
AO output: 0.1-0.3V (relatively pollution-free), the highest concentration voltage is about 4V
Special reminder: After the sensor is powered on, it needs to be warmed up for about 20S to stabilize the measured data. It is normal for the sensor to heat up, because there is a heating wire inside, if it is hot, it will not be normal.

Description:
MAXIM MAX6675 is an American company with a cold junction compensation, linearity correction, thermocouple break detection ADC Serial K-type thermocouple, its temperature resolution capability is 0. 25 Degree, cold junction compensation range - 20 ~ 80 Degree, wide operating voltage range 3. 0 ~ 5. 5V
Operating voltage: 3. 0 ~ 5. 5V
Internal integrated cold junction compensation circuit;
With a simple three serial interface;
Temperature signal can be converted into 12-bit digital
Temperature resolution of 0. 25 Degree;
Cold junction compensation range: - 20 ~ 80 Degree,
Embedded thermocouple break detection circuitry.
Using SPI 3 wire communication
K-type temperature probe
Type K temperature range 0-800 degrees

Description:
MAXIM MAX6675 is an American company with a cold junction compensation, linearity correction, thermocouple break detection ADC Serial K-type thermocouple, its temperature resolution capability is 0. 25 Degree, cold junction compensation range - 20 ~ 80 Degree, wide operating voltage range 3. 0 ~ 5. 5V
Operating voltage: 3. 0 ~ 5. 5V
Internal integrated cold junction compensation circuit;
With a simple three serial interface;
Temperature signal can be converted into 12-bit digital
Temperature resolution of 0. 25 Degree;
Cold junction compensation range: - 20 ~ 80 Degree,
Embedded thermocouple break detection circuitry.
Using SPI 3 wire communication
K-type temperature probe
Type K temperature range 0-800 degrees

1. Onboard TTP226 capacitive 8-key touch sensor IC
2. Onboard 8-channel level status indicator
3. Working voltage: 2.4V-5.5V
4. The module can set output mode, key output mode, longest output time and fast/low power consumption selection
5. PCB board size: 47.5(mm)x46(mm)
Shipping list:
TTP226 8-way touch switch module x 1

Product description:
1. Supports MP3 format, automatically plays after power on, and the red LED indicator is updated when playing.
2. Support U disk (32G tested), TF card (16G tested) playback mode; power on the default TF card mode, if there is no TF card, it will automatically jump to U disk mode, and both devices are installed, you can manually Set the playback mode, please refer to the button operation instructions for details.
3. Press the button to adjust up and down track switching, volume -, pause/play, mode switching, please see the button operation instructions for details.
4. Press the button to set the "single/full song" cycle, the power-on default full song cycle, press the "Repeat" button to change the cycle mode
Key operation instructions
"Prev/V--" key: "Short press" to switch the "previous" song, "long press" to "decrease volume"
"Next/v " key: "short press" to switch to "next" song, "long press" to "volume increase"
"P/P/Mode" key: "Short press" for "play/pause" switch, "long press" for U disk, TF card "mode" select "Repeat" key: "short press" for "single/pause" "All songs" cycle switch (no long press function)
Note: 1. "Long press" time is about 2S
2. If you use USB flash drive mode, 5V power supply is recommended. Some USB flash drives do not support 3.7V power supply.
Product parameters:
Product name: mp3 lossless decoder board (support TF card/U disk)
Power supply range: 3.7~5.5V
Product size: 45.72mm * 35.14mm* 12.0mm
color: Blue
Weight: 11.3g (including packaging)
Packaging: Single module electrostatic bag packaging

Module features and parameters:
Three kinds of interfaces: MICRO MINI TYPE-C
You can directly use the mobile phone charger as input to charge the lithium battery,
And still retain the input voltage wiring solder joints, which can be very convenient for DIY
Input voltage: 5V
Charging cut-off voltage: 4.2V ±1%
Maximum charging current: 1000mA
Battery over-discharge protection voltage: 2.5V
Battery overcurrent protection current: 3A
Instructions:
Note: When the battery is connected for the first time, there may be no voltage output between OUT and OUT-. At this time, the protection circuit can be activated by charging it with a 5V voltage. If the battery is short-circuited from B B- and then connected again Need to charge to activate the protection circuit. When using a mobile phone charger for input, please note that the charger must be able to output 1A or above, otherwise it may not be able to charge normally
The TYPE C USB female socket and the -pad next to it are the power input terminals, which are connected to 5V voltage. B is connected to the positive electrode of the lithium battery, and B- is connected to the negative electrode of the lithium battery. OUT and OUT- are connected to the load, such as the positive and negative poles of the mobile booster board or other loads.
Connect the battery to B B-, insert the mobile phone charger into the USB socket, the red light is on for charging, and the blue light is on for full.

Module features and parameters:
Three kinds of interfaces: MICRO MINI TYPE-C
You can directly use the mobile phone charger as input to charge the lithium battery,
And still retain the input voltage wiring solder joints, which can be very convenient for DIY
Input voltage: 5V
Charging cut-off voltage: 4.2V ±1%
Maximum charging current: 1000mA
Battery over-discharge protection voltage: 2.5V
Battery overcurrent protection current: 3A
Instructions:
Note: When the battery is connected for the first time, there may be no voltage output between OUT and OUT-. At this time, the protection circuit can be activated by charging it with a 5V voltage. If the battery is short-circuited from B B- and then connected again Need to charge to activate the protection circuit. When using a mobile phone charger for input, please note that the charger must be able to output 1A or above, otherwise it may not be able to charge normally
The TYPE C USB female socket and the -pad next to it are the power input terminals, which are connected to 5V voltage. B is connected to the positive electrode of the lithium battery, and B- is connected to the negative electrode of the lithium battery. OUT and OUT- are connected to the load, such as the positive and negative poles of the mobile booster board or other loads.
Connect the battery to B B-, insert the mobile phone charger into the USB socket, the red light is on for charging, and the blue light is on for full.

Module features and parameters:
Three kinds of interfaces: MICRO MINI TYPE-C
You can directly use the mobile phone charger as input to charge the lithium battery,
And still retain the input voltage wiring solder joints, which can be very convenient for DIY
Input voltage: 5V
Charging cut-off voltage: 4.2V ±1%
Maximum charging current: 1000mA
Battery over-discharge protection voltage: 2.5V
Battery overcurrent protection current: 3A
Instructions:
Note: When the battery is connected for the first time, there may be no voltage output between OUT and OUT-. At this time, the protection circuit can be activated by charging it with a 5V voltage. If the battery is short-circuited from B B- and then connected again Need to charge to activate the protection circuit. When using a mobile phone charger for input, please note that the charger must be able to output 1A or above, otherwise it may not be able to charge normally
The TYPE C USB female socket and the -pad next to it are the power input terminals, which are connected to 5V voltage. B is connected to the positive electrode of the lithium battery, and B- is connected to the negative electrode of the lithium battery. OUT and OUT- are connected to the load, such as the positive and negative poles of the mobile booster board or other loads.
Connect the battery to B B-, insert the mobile phone charger into the USB socket, the red light is on for charging, and the blue light is on for full.

Module features and parameters:
Three kinds of interfaces: MICRO MINI TYPE-C
You can directly use the mobile phone charger as input to charge the lithium battery,
And still retain the input voltage wiring solder joints, which can be very convenient for DIY
Input voltage: 5V
Charging cut-off voltage: 4.2V ±1%
Maximum charging current: 1000mA
Battery over-discharge protection voltage: 2.5V
Battery overcurrent protection current: 3A
Instructions:
Note: When the battery is connected for the first time, there may be no voltage output between OUT and OUT-. At this time, the protection circuit can be activated by charging it with a 5V voltage. If the battery is short-circuited from B B- and then connected again Need to charge to activate the protection circuit. When using a mobile phone charger for input, please note that the charger must be able to output 1A or above, otherwise it may not be able to charge normally
The TYPE C USB female socket and the -pad next to it are the power input terminals, which are connected to 5V voltage. B is connected to the positive electrode of the lithium battery, and B- is connected to the negative electrode of the lithium battery. OUT and OUT- are connected to the load, such as the positive and negative poles of the mobile booster board or other loads.
Connect the battery to B B-, insert the mobile phone charger into the USB socket, the red light is on for charging, and the blue light is on for full.

Module features and parameters:
Three kinds of interfaces: MICRO MINI TYPE-C
You can directly use the mobile phone charger as input to charge the lithium battery,
And still retain the input voltage wiring solder joints, which can be very convenient for DIY
Input voltage: 5V
Charging cut-off voltage: 4.2V ±1%
Maximum charging current: 1000mA
Battery over-discharge protection voltage: 2.5V
Battery overcurrent protection current: 3A
Instructions:
Note: When the battery is connected for the first time, there may be no voltage output between OUT and OUT-. At this time, the protection circuit can be activated by charging it with a 5V voltage. If the battery is short-circuited from B B- and then connected again Need to charge to activate the protection circuit. When using a mobile phone charger for input, please note that the charger must be able to output 1A or above, otherwise it may not be able to charge normally
The TYPE C USB female socket and the -pad next to it are the power input terminals, which are connected to 5V voltage. B is connected to the positive electrode of the lithium battery, and B- is connected to the negative electrode of the lithium battery. OUT and OUT- are connected to the load, such as the positive and negative poles of the mobile booster board or other loads.
Connect the battery to B B-, insert the mobile phone charger into the USB socket, the red light is on for charging, and the blue light is on for full.

Module features and parameters:
Three kinds of interfaces: MICRO MINI TYPE-C
You can directly use the mobile phone charger as input to charge the lithium battery,
And still retain the input voltage wiring solder joints, which can be very convenient for DIY
Input voltage: 5V
Charging cut-off voltage: 4.2V ±1%
Maximum charging current: 1000mA
Battery over-discharge protection voltage: 2.5V
Battery overcurrent protection current: 3A
Instructions:
Note: When the battery is connected for the first time, there may be no voltage output between OUT and OUT-. At this time, the protection circuit can be activated by charging it with a 5V voltage. If the battery is short-circuited from B B- and then connected again Need to charge to activate the protection circuit. When using a mobile phone charger for input, please note that the charger must be able to output 1A or above, otherwise it may not be able to charge normally
The TYPE C USB female socket and the -pad next to it are the power input terminals, which are connected to 5V voltage. B is connected to the positive electrode of the lithium battery, and B- is connected to the negative electrode of the lithium battery. OUT and OUT- are connected to the load, such as the positive and negative poles of the mobile booster board or other loads.
Connect the battery to B B-, insert the mobile phone charger into the USB socket, the red light is on for charging, and the blue light is on for full.

Data download link:
https://drive.google.com/file/d/15F-QEphoQjYLnPql8yqYJF1IGbM6U452/view?usp=sharing
1. The scope of application of this module:
1. Used as a square wave signal generator to generate square wave signals for experimental development.
2. It is used to generate square wave signal to drive the stepper motor driver.
3. Generate adjustable pulses for MCU use.
4. Generate adjustable pulses to control related circuits.
2. Brief description:
1. Size: 3.1CM*2.2CM
1. Main chip: NE555;
2. Input voltage: 5V-15VDC. When powered by 5V, the output current can be around 15MA; when powered by 12V, the output current can be around 35MA;
3. Input current: ≥100MA
4. Output amplitude: 4.2V V-PP to 11.4V V-PP. (depending on the input voltage, the output amplitude will be different)
5. Output current: ≥15MA (5V power supply, when V-PP is greater than 50% ), ≥35MA (12V power supply, when V-PP is greater than 50% )
Three advantages:
1. The output has LED indication, and it is directly clear whether there is any output (the amount of LED is at low level, the LED is off at high level, and the LED flashes when the frequency is relatively low);
2. The output frequency range is optional, making the output frequency more continuously adjustable;
Low frequency file: 1Hz～50Hz
IF file: 50Hz～1kHz
Medium and high frequency range: 1KHz～10kHz
High frequency file: 10kHz～200kHz
3. The output duty cycle can be fine-tuned. The duty cycle and frequency are not adjustable separately. Adjusting the duty cycle will change the frequency;
4. The output frequency is adjustable;
Period T=0.7(RA 2RB)C
RA and RB are adjustable from 0 to 10K;
C=0.001UF at low frequency;
C=0.1UF at intermediate frequency;
Medium and high frequency range C=1UF;
C=100UF at high frequency, so buyers can calculate the frequency of the waveform by themselves

PRODUCT DETAILS 
Application scenarios 
Industrial manufacturing
Short distance replacement of signal cable in industrial site reduces wiring, facilitates management and improves production efficiency.
Smart home
Physical layer technology solution of home Internet of things, diffraction performance, teaching children, villa level coverage.
Smart farm
Accurate monitoring of the details of each operation area, convenient for statistical management, the first time to identify potential risks.
Hotel solutions
Support a large number of access points, facilitate the unified management of the background, reduce the inspection manpower, and improve the supervision efficiency. 
Features
Based on the development of esp8266 chip, the module integrates the transmission function, supports the serial instruction set, and users can access the network through the serial port. It is widely used in smart wear, smart home security, remote control, automotive electronics, intelligent lighting, industrial Internet of things and other fields.
Product parameters
Model

ESP-01/ESP-01S

Describe
Packaging form

DIP-8

Direct insertion
Module Size

24.9*14.6*11mm

±0.2mm
SPI FLASH

8Mbit

Default
Support interface

/

UART/GPIO
Available IO port

2

Series Rate

4608000bps

Support300~4608000bps,
default115200bps
Spectrum range

2.4GHz

2412~2484MHz
Antenna form

On board

PCB antenna,gain 2dBI
Transmitting power

/

802.11b:16±2dBm;
802.11g:16±2dBm;
802. 11n:16±2dBm
Security

/

WEP/WPA-PSK/WPA2-PSK
Scope of power supply

3.3V

3.0~3.6V,current>500MA
Working temperature

Industrial grade

-20℃~ 85℃
At support

Built in intelligent processing

Itcan be read by at command
USB to ESP8266 
PRODUCT DETAIS
DESCRIPTION
This moduel is an USB adpater / programmer for ESP8266 moduels of type ESP-01. It is conveniently fitted with a 2x4P. 2.54mm female header to plug the ESP01 (according to illustration picture 2) and configure or run it right away. A large 1000μF cap will help getting a steady 5.0V VCC from the USB bus and and jumper (on the right of the 2X4F header) (we dont't offer any jumper!!!!)
Will help configuring the GPI00 line according needs. The module is based on the USB-UART bridget CH340 from WCH which is compatible with all platforms. 
NOTE
For an usage with A-rduino ESP8266 platform and for Arduino IDE. it is necessary to switch manually the GPIO0 state for working mode, in order to get a fully automatic upload it is most likely possible, for a very limited effort, to assign an unused control line from CH340 t driver the GPIO0 line (probably at the cost of a necessary logic inversion), refer to the CH340 datasheet and most important to the NodeMCU V0.9 which use the CH340 and alreadv implements this solution, the schematic is open source and easily avallable.

PRODUCT DETAILS 
Application scenarios 
Industrial manufacturing
Short distance replacement of signal cable in industrial site reduces wiring, facilitates management and improves production efficiency.
Smart home
Physical layer technology solution of home Internet of things, diffraction performance, teaching children, villa level coverage.
Smart farm
Accurate monitoring of the details of each operation area, convenient for statistical management, the first time to identify potential risks.
Hotel solutions
Support a large number of access points, facilitate the unified management of the background, reduce the inspection manpower, and improve the supervision efficiency. 
Features
Based on the development of esp8266 chip, the module integrates the transmission function, supports the serial instruction set, and users can access the network through the serial port. It is widely used in smart wear, smart home security, remote control, automotive electronics, intelligent lighting, industrial Internet of things and other fields.
Product parameters
Model

ESP-01/ESP-01S

Describe
Packaging form

DIP-8

Direct insertion
Module Size

24.9*14.6*11mm

±0.2mm
SPI FLASH

8Mbit

Default
Support interface

/

UART/GPIO
Available IO port

2

Series Rate

4608000bps

Support300~4608000bps,
default115200bps
Spectrum range

2.4GHz

2412~2484MHz
Antenna form

On board

PCB antenna,gain 2dBI
Transmitting power

/

802.11b:16±2dBm;
802.11g:16±2dBm;
802. 11n:16±2dBm
Security

/

WEP/WPA-PSK/WPA2-PSK
Scope of power supply

3.3V

3.0~3.6V,current>500MA
Working temperature

Industrial grade

-20℃~ 85℃
At support

Built in intelligent processing

Itcan be read by at command
USB to ESP8266 
PRODUCT DETAIS
DESCRIPTION
This moduel is an USB adpater / programmer for ESP8266 moduels of type ESP-01. It is conveniently fitted with a 2x4P. 2.54mm female header to plug the ESP01 (according to illustration picture 2) and configure or run it right away. A large 1000μF cap will help getting a steady 5.0V VCC from the USB bus and and jumper (on the right of the 2X4F header) (we dont't offer any jumper!!!!)
Will help configuring the GPI00 line according needs. The module is based on the USB-UART bridget CH340 from WCH which is compatible with all platforms. 
NOTE
For an usage with A-rduino ESP8266 platform and for Arduino IDE. it is necessary to switch manually the GPIO0 state for working mode, in order to get a fully automatic upload it is most likely possible, for a very limited effort, to assign an unused control line from CH340 t driver the GPIO0 line (probably at the cost of a necessary logic inversion), refer to the CH340 datasheet and most important to the NodeMCU V0.9 which use the CH340 and alreadv implements this solution, the schematic is open source and easily avallable.

PRODUCT DETAILS 
Application scenarios 
Industrial manufacturing
Short distance replacement of signal cable in industrial site reduces wiring, facilitates management and improves production efficiency.
Smart home
Physical layer technology solution of home Internet of things, diffraction performance, teaching children, villa level coverage.
Smart farm
Accurate monitoring of the details of each operation area, convenient for statistical management, the first time to identify potential risks.
Hotel solutions
Support a large number of access points, facilitate the unified management of the background, reduce the inspection manpower, and improve the supervision efficiency. 
Features
Based on the development of esp8266 chip, the module integrates the transmission function, supports the serial instruction set, and users can access the network through the serial port. It is widely used in smart wear, smart home security, remote control, automotive electronics, intelligent lighting, industrial Internet of things and other fields.
Product parameters
Model

ESP-01/ESP-01S

Describe
Packaging form

DIP-8

Direct insertion
Module Size

24.9*14.6*11mm

±0.2mm
SPI FLASH

8Mbit

Default
Support interface

/

UART/GPIO
Available IO port

2

Series Rate

4608000bps

Support300~4608000bps,
default115200bps
Spectrum range

2.4GHz

2412~2484MHz
Antenna form

On board

PCB antenna,gain 2dBI
Transmitting power

/

802.11b:16±2dBm;
802.11g:16±2dBm;
802. 11n:16±2dBm
Security

/

WEP/WPA-PSK/WPA2-PSK
Scope of power supply

3.3V

3.0~3.6V,current>500MA
Working temperature

Industrial grade

-20℃~ 85℃
At support

Built in intelligent processing

Itcan be read by at command
USB to ESP8266 
PRODUCT DETAIS
DESCRIPTION
This moduel is an USB adpater / programmer for ESP8266 moduels of type ESP-01. It is conveniently fitted with a 2x4P. 2.54mm female header to plug the ESP01 (according to illustration picture 2) and configure or run it right away. A large 1000μF cap will help getting a steady 5.0V VCC from the USB bus and and jumper (on the right of the 2X4F header) (we dont't offer any jumper!!!!)
Will help configuring the GPI00 line according needs. The module is based on the USB-UART bridget CH340 from WCH which is compatible with all platforms. 
NOTE
For an usage with A-rduino ESP8266 platform and for Arduino IDE. it is necessary to switch manually the GPIO0 state for working mode, in order to get a fully automatic upload it is most likely possible, for a very limited effort, to assign an unused control line from CH340 t driver the GPIO0 line (probably at the cost of a necessary logic inversion), refer to the CH340 datasheet and most important to the NodeMCU V0.9 which use the CH340 and alreadv implements this solution, the schematic is open source and easily avallable.

TXS0108E High-speed full-duplex 8-channel level conversion module 8-bit bidirectional voltage converter
Module using chip: TXS0108E
High-speed full-duplex 8-channel level conversion module
Provide two-way communication capability
VCCA terminal supports voltage 1.2V-3.6V
VCCB end supports voltage 1.65v-5.5v
Can provide 3.3-5V 1.8-3.3v and other common level conversion capabilities
Main application, 5V single-chip microcomputer and 3.3V module 3.3V single-chip microcomputer and 5V module, and other communication compatible support
The level conversion of the communication between single-chip microcomputer and SD card
Single-chip microcomputer and iic, spi serial device level conversion
OE enable IO high level is effective, it is recommended to connect the IO port of the low voltage end

This transparent transmission module realizes the mutual conversion of TTL signal and RS485 signal, but everyone must know that 485 is half-duplex communication. This communication method can realize two-way communication, but it cannot be carried out in both directions at the same time. Take turns alternately; that is, each end of the communication channel can be the sender or the receiver, but at the same time, information can only have one direction of transmission.
Baud rate: 110~128000bps support
Module highlights:
(1) Compatible with 3.3V and 5.0V power supply
(2) 3.3V and 5.0V signal compatible
(3) Industrial-grade design, strong anti-interference ability, and a more effective 485 lightning protection design, which can be used in industrial sites and harsh environments in the field. The working temperature is -40°C to 85°C, and the transmission distance is Up to kilometers (test with 850 meters of 2*1.5 cable, it is recommended to use within 800 meters, please add a repeater for more than 800 meters)
(4) The half-hole process design is adopted, and the thickness of the board is 0.8mm, which can be easily used as a mother board or as a solder terminal.
(5) With RXD and TXD signal indicators, you can have a panoramic view of the transceiver status
Module features:
(1) This module fully considers the 485 bus lightning protection design and anti-interference design. In the long-distance transmission in the field, connecting the "earth-to-earth" end of the module to the earth can play a good role in anti-interference and lightning protection. , Make the 485 bus safer; the indoor short-distance transmission can not be connected to the earth.
(2) The standard 2.54 pitch design is adopted to facilitate your secondary development
(3) It has a matching resistance of 120 ohms. Short-circuiting R0 can enable the matching resistance. It is recommended to short-circuit it for long-distance transmission.
(4) Support multi-machine communication, allowing connection to the bus of more than 128 devices
(5) This module can be hot-swapped, and there will be no signal plugging phenomenon caused by hot-swapping of other 485 chips
(6) Spread copper in a large area to prevent signal interference

Product Description
1. Working Voltage: 3.7V Lithium Battery 600MA or 5V USB Power Supply.
2.Chip: GPD2846A.
3. Chip Footprint: SOP16.
4.PCB Size: 34.23MM*22.33MM*1MM.
5.With 2W Mixed mono.
6.With a Power supply, it can play Automatically.
7. With LED indicator.
8. Supports MP3 format playback.
9. Supports USB audio mode.
10.Supports 3 types of FM radio chip: RDA5807, BK1080 ,and RTC6207E.
11.Does not support infrared remote control
12. Does not support USB device mode.

This super small mono amplifier is surprisingly powerful - able to deliver up to 2.5 Watts into 4-8 ohm impedance speakers. Inside the miniature chip is a class D controller, able to run from 2.0V-5.5VDC. Since the amp is a class D, its very efficient (over 90% efficient when driving an 8Ω speaker at over half a Watt) - making it perfect for portable and battery-powered projects. It has built in thermal and over-current protection but we could barely tell it got hot. There's even a volume trim pot so you can adjust the volume on the board down from the default 24dB gain. This board is a welcome upgrade to basic "LM386" amps! CJMCU
The A and A- inputs of the amplifier go through 1.0uF capacitors, so they are fully 'differential' - if you don't have differential outputs, simply tie the Audio- pin  to ground. The output is "Bridge Tied" - that means the output pins connect directly to the speaker pins, no connection to ground. The output is a high frequency 250KHz square wave PWM that is then 'averaged out' by the speaker coil - the high frequencies are not heard. All the above means that you can't connect the output into another amplifier, it should drive the speakers directly. CJMCU
Comes with a fully assembled and tested breakout board. We also include header to plug it into a breadboard and a 3.5mm screw-terminal blocks so you can easily attach/detach your speaker. You will be ready to rock in 15 minutes! Speaker is not included, use any 4 ohm or greater impedance speaker.
Output Power: 2.5W at 4Ω, 10% THD, 1.5W at 8Ω, 10% THD, with 5.5V Supply
50dB PSRR at 1KHz
Filterless design, with ferrite bead capacitors on output.
Fixed 24dB gain, onboard trim potentiometer for adjusting input volume.
Thermal and short-circuit/over-current protection
Low current draw: 4mA quiescent and 1uA in shutdown mode

Features:
1. Brand new 340 chip. This series of chips are officially recommended by STC to convert from USB to TTL. There will never be incompatibility due to different drivers/different computers, etc.! ! !
2. Golden appearance, high-quality yellow high-grade pin header, durable and beautiful than the black pin header on the market;
3. There are not only the power light PWR, but also the TXD and RXD indicator lights. The RTS and CTS positions are reserved to facilitate intuitive understanding of whether the product is working without an instrument;
4. 3V3 and 5V are selected by short circuit;
5. Support WINDOWS 98/ME/2000/XP/Server 2003/VISTA/Server 2008/Win7/Win8 32-bit/64-bit

Features:
1. Brand new 340 chip. This series of chips are officially recommended by STC to convert from USB to TTL. There will never be incompatibility due to different drivers/different computers, etc.! ! !
2. Golden appearance, high-quality yellow high-grade pin header, durable and beautiful than the black pin header on the market;
3. There are not only the power light PWR, but also the TXD and RXD indicator lights. The RTS and CTS positions are reserved to facilitate intuitive understanding of whether the product is working without an instrument;
4. 3V3 and 5V are selected by short circuit;
5. Support WINDOWS 98/ME/2000/XP/Server 2003/VISTA/Server 2008/Win7/Win8 32-bit/64-bit

Size: 25*17*5mm volume
Input voltage: 5-18V DC power supply (the actual 5-12V is appropriate)
Charging status: full and no-load blue light, red during charging
The voltage setting must be operated in the power-off state, and the input of the switch must be disconnected and then switched.
It can also be used for white LED constant current drive: set one single lithium drive, set dual lithium drive 2 strings.

Module Highlights:
1. Synchronous rectification scheme, wide voltage, high current, high efficiency;
2. With DC plug and terminal, easy to use;
3. With USB port, with fast charging identification chip, compatible with Android iphone
Product parameters:
1: Working voltage: DC 9V--36V;
2: Output voltage: 5.2V/5A/25W
3: Output capability:
9~24V input: output 5.2V/6A/30W
24~32V input: output 5.2V/5A/25W
32~36V input: output 5.2V/3.5A/18W
4: Size: 63*27*10mm (L*W*H)
5: Weight: 22g

ATTINY85 module Blue Black
1. Support for the Arduino IDE 1.0 (OSX/Win/Linux).
2. Power via USB or External Source - 5v or 7-16v (automatic selection).
3. On-board 150ma 5V Regulator.
4. Built-in USB (and serial debugging).
5. 6 I/O Pins (2 are used for USB only if your program actively communicates over USB, otherwise you can use all 6 even if you are programming via USB).
6. 8k Flash Memory (about 6k after bootloader).
7. I2C and SPI (vis USI).
8. PWM on 3 pins (more possible with Software PWM).
9. ADC on 4 pins.
10. Power LED and Test/Status LED

ATTINY85 module Blue Black
1. Support for the Arduino IDE 1.0 (OSX/Win/Linux).
2. Power via USB or External Source - 5v or 7-16v (automatic selection).
3. On-board 150ma 5V Regulator.
4. Built-in USB (and serial debugging).
5. 6 I/O Pins (2 are used for USB only if your program actively communicates over USB, otherwise you can use all 6 even if you are programming via USB).
6. 8k Flash Memory (about 6k after bootloader).
7. I2C and SPI (vis USI).
8. PWM on 3 pins (more possible with Software PWM).
9. ADC on 4 pins.
10. Power LED and Test/Status LED

This module has all the performance of PL-2303 flashing board!
TTL level 5V/3V3 can be freely selected. With 3 status lights! The first choice for MCU upgrades, middle 9 upgrades, hard disk repairs, routing upgrades, etc.
CH340 module/USB to TTL/USB to RS232/more than PL2303/STC downloader/in 9 flashing board STC official designated download chip. It is perfectly compatible with all STC series single-chip microcomputers, and will never cause downloading problems due to different drivers like the PL2303 solution. Super stable.
1. Brand new original CH340G chip, this series of chips are officially recommended by STC USB to TTL chip, there will never be incompatibility due to different drivers/different computers, etc.! ! !
2. High-quality yellow high-grade pin headers are more durable and beautiful than black pin headers on the market;
3. Not only the power light PWR, but also TXD and RXD indicator lights, it is convenient to intuitively know whether the product is working without an instrument;
4. 3V3 and 5V are selected by short circuit;
5. Support WINDOWS 98/ME/2000/XP/Server 2003/VISTA/
Server 2008/Win7/Win8 32-bit/64-bit
6. Module size: 55mm * 16mm, PCB size: 33mm * 16mm;
Delivery list: one 340 brushing board

APDS-9930 gesture recognition sensor
Product Introduction
Proximity and non-contact gesture detection Gesture Sensor 3APDS-9930 provides 12C interface compatible ambient light sensor (ALS, Ambient Light Sensor) and proximity sensor with infrared LED in a single 8-pin package. The ambient light sensor uses dual diodes. To approximate the human visual response of low lumen performance under 0.01lux illuminance, the high sensitivity provided allows the device to operate behind dark glass.
The proximity sensor is fully calibrated to perform 100mm object inspection, eliminating the need for factory calibration of terminal equipment and sub-components. From bright sunlight to dark rooms, the proximity detection function works well. The micro-optical lens is added to the module to provide high-efficiency transmission and reception of infrared energy, which can reduce overall power consumption. In addition, the internal state machine can make the device enter a low-power mode, bringing extremely low average power consumption.
Features
1. Optical module integrating ALS, infrared LED and proximity detector
2. Ambient Light Sensing (ALS, Ambient Light Sensing) is similar to the visual response of the human eye
3. Programmable interrupt function with upper and lower thresholds
4. Up to 16-bit resolution
5. High sensitivity of operation behind dark glass
6, 0.01ux low lumen performance
7. The proximity detection is fully calibrated to 100 mm detection
8. Integrated infrared LED and synchronous LED driver
9. Exempt the factory calibration of the proximity sensor
10. Programmable waiting timer, waiting state power consumption -90μA typical value
11. The programmable range is from 2.7 milliseconds to more than 8 seconds
12. 12C interface compatible, up to 400kHz (12C fast mode)
13. Dedicated interrupt pin
14. Sleep mode power-2.2μA typical
Application
1. Dimmable mobile phone backlight
2. The touch screen of the mobile phone can be disabled
3. Laptop monitor safety
4. Auto-shoulder hands-free call mode 5. Automatic menu pop-up
6. Digital camera eye sensor

Module parameters
Module nature: non-isolated step-down module (BUCK) synchronous rectification
Input voltage: DC 4.5-24V
Output voltage: integrated adjustable and fixed output, fixed output voltage can be selected on the back
Adjustable range (0.8-17V), fixed voltage (1.8V 2.5V 3.3V 5V 9V 12V)
Output current: 3A (please pay attention to heat dissipation at full load), the actual test input 12V output within 1.5A does not require special heat dissipation.
Conversion efficiency: 97.5% (6.5 to 5V 0.7A)
Switching frequency: 500KHz
Output ripple: about 20mV (12V to 5V3A) 20M bandwidth
Working temperature: industrial grade (-40℃ to 85℃) (the higher the ambient temperature, the smaller the output power)
Output overvoltage protection: none
Full load temperature rise: 40℃
Quiescent current: 0.85 mA
Load regulation rate: ±1%
Voltage adjustment rate: ±0.5%
Dynamic response speed: 5% 200uS
Output short-circuit protection: Yes, please do not short-circuit for a long time
Input reverse connection protection: None, input reverse connection protection diode
Enable control: Yes, high level work, low level stop working, high level is 2-5V, low level is about 0V. By default, there is a pull-up to the positive input inside.
Connection method: welding
Input method: welding
Output mode: welding/pin header
Welding hole spacing: 2.54 mm
Size: 20(L)*11(W)*5(H)mm

Note: This price does not include NRF24L01 module!
Typical application:
Wireless remote control, data transmission
Wireless meter reading system
Wireless detection system
Wireless data acquisition system
VOIP system
Access control system
Wireless label, wireless 232, wireless 422/485 data communication
The command is simple and reliable, and communication can be carried out without any settings after receiving the goods.
System parameters:
Support WINDOWS 98/ME/2000/XP/Server 2003/VISTA/Server 2008/Win7/WIN8 32-bit/64-bit.
USB wireless serial port transmission module, support AT to configure the system clearly!
Use stable CH340T chip as USB to serial port.
Multi-frequency points: 125 frequency points, meeting the needs of multi-point communication and FM communication.
The two LED lights of the module are power indicator (red) and nRF24L01 status indicator (blue/green).
The built-in watchdog anti-driver program can run stably in harsh industrial control situations.
The insertion direction of the nRF24L01 module is as shown in the picture below on the webpage. The system will not work if it is inserted incorrectly, but the wireless module will not be burned out.
Using this module for wireless serial communication can make the transmission distance farther (100~1100m, depending on the power of the wireless module used), far exceeding the transmission distance of the Bluetooth serial port (10m)

MAX30100Description:
Heart Rate click carries Maxim's MAX30100 integrated pulse oximetry and a heart-rate sensor. It's an optical sensor that derives its readings from emitting two wavelengths of light from two LEDs - a red and an infrared one - then measuring the absorbance of pulsing blood through a photodetector. This particular LED color combination is optimized for reading the data through the tip of one's finger. The signal is processed by a low-noise analog signal processing unit and communicated to the target MCU through the mikroBUS I2C interface. Developers of end-user applications should note that the readings can be negatively impacted by excess motion and changes in temperature. Also, too much pressure can constrict capillary blood flow and therefore diminish the reliability of the data. A programmable INT pin is also available. Uses 3.3V power supply.
Key features:
Optical sensor: IR and red LED combined with a photodetector
Measures absorbance of pulsing blood
I2C interface plus INT pin
3.3V power supply
Key Benefits:
Motion artefact resillence
Ambient light cancellation
Ready-to-use examples save development time
Supported in all MikroElektronika compilers
Applications
Developing algorithms for pulse oximetry and heart rate readings through the tip of a finger.
MAX30102Description:
Optical Heart-Rate Monitor and Pulse Oximetry Solution
Tiny 12.7mm x 12.7mm (0.5in x 0.5in) Board Size
Low Power
Device Drivers
Free Algorithm
Example C Source Code For Arduino And embed Platforms
Test Data
Competitive Advantages
Highly integrated, small-size sensor
Non-chest based heart-rate/SpO2 detection
Ultra-low power consumption
Applications:
Wearables
Heart-rate monitor
Pulse oximeter

MAX30100Description:
Heart Rate click carries Maxim's MAX30100 integrated pulse oximetry and a heart-rate sensor. It's an optical sensor that derives its readings from emitting two wavelengths of light from two LEDs - a red and an infrared one - then measuring the absorbance of pulsing blood through a photodetector. This particular LED color combination is optimized for reading the data through the tip of one's finger. The signal is processed by a low-noise analog signal processing unit and communicated to the target MCU through the mikroBUS I2C interface. Developers of end-user applications should note that the readings can be negatively impacted by excess motion and changes in temperature. Also, too much pressure can constrict capillary blood flow and therefore diminish the reliability of the data. A programmable INT pin is also available. Uses 3.3V power supply.
Key features:
Optical sensor: IR and red LED combined with a photodetector
Measures absorbance of pulsing blood
I2C interface plus INT pin
3.3V power supply
Key Benefits:
Motion artefact resillence
Ambient light cancellation
Ready-to-use examples save development time
Supported in all MikroElektronika compilers
Applications
Developing algorithms for pulse oximetry and heart rate readings through the tip of a finger.
MAX30102Description:
Optical Heart-Rate Monitor and Pulse Oximetry Solution
Tiny 12.7mm x 12.7mm (0.5in x 0.5in) Board Size
Low Power
Device Drivers
Free Algorithm
Example C Source Code For Arduino And embed Platforms
Test Data
Competitive Advantages
Highly integrated, small-size sensor
Non-chest based heart-rate/SpO2 detection
Ultra-low power consumption
Applications:
Wearables
Heart-rate monitor
Pulse oximeter

AD7705 dual 16-bit ADC data acquisition module input gain programmable SPI interface TM7705

Characteristics
Power Supply

3.7-5V
SNR

90dB
THD N

-70dB
Crosstalk

-86dB
DNR

91dB
Support Profile

A2DP/AVCTP/AVDTP/AVRCP/HFP
LOS

>15m
Detailed description
Power connector

Universal Micro USB 5V power supply
3.7-5V power supply pad

Realize external 3.7-5V power supply modification
UDisk interface

Support playing MP3/WAV/APE/FLAC files in U disk, support FAT16/32 file format
TF card interface

Support playing MP3/WAV/APE/FLAC files in TF card, support FAT16/32 file format
LED indication

The blue light in bluetooth mode is on, and the blue light in music mode is flashing
3.5mm stereo output

Standard 3.5mm interface, output stereo sound source, can insert earphones, connect power amplifier and other equipment
Button function definition
button

Features
MODE

"Short press", TF card, U disk, Bluetooth mode switch
P/P

"Short press" to switch between play and pause
NEXT/V

"Short press "Next song," long press "Volume increase
PREV/V-

"Short press" the previous song, "long press" the volume to decrease
RPT

"Short press", single/loop switch
Instructions
1. Mode control
When the decoder board is not plugged in with a USB flash drive or TF card, the default is Bluetooth mode when powered on; when the decoder board is plugged in with a USB flash drive or TF card, the default is in music mode when powered on; the mode is switched through the MODE button.
2. Music mode
Insert the U disk or TF card to play the stored audio files.
3. Bluetooth mode
Switch the mode to broadcast the English "The bluetooth device is ready to pair", indicating that you enter the Bluetooth mode and wait for pairing; the "XFW_BT" searched by the mobile phone's Bluetooth is the device name of the decoder board, click connect, the decoder board prompts "The bluetooth device is connected successfully ", it means that the decoder board is successfully connected to the mobile phone and you can play music.
Precautions
1. If U Disk is playing, it is recommended to use USB 5V power supply (3.7V lithium battery is not recommended), because the early U disk does not support 3.7V voltage.

Mini 4056 1A Lithium Battery Charging Module
Module parameters
Interface

MICRO
Charging current

1A
Input voltage

5V~6V
Output voltage

4.2V
Size

12*5*15.5*35mm

Features
The charge cycle is automatically terminated when the charge current drops to 100mA after reaching the final float voltage.
When the battery voltage drops below 4.05V (roughly corresponding to 80% to 90% of the battery capacity), the charge cycle restarts
beginning.
When the battery voltage is below 2.9V, the battery will be precharged at 100mA.
Product size: 12.5×15.5×3.5mm (excluding the 1mm protruding Micro-USB socket)

1. Onboard pop-up MINI SD card interface
2. The relevant pins have been led out and marked
3. Size: 18.5(mm)x17.5(mm)
Shipping list:
MINI SD card module x 1

1. Onboard pop-up MINI SD card interface
2. The relevant pins have been led out and marked
3. Size: 18.5(mm)x17.5(mm)
Shipping list:
MINI SD card module x 1

HTTM-□◇△
HTTM is the abbreviation of HelTec Touch Model;
□→ Number of keys: S—single key, D—double key, T—three key, F—four built;
◇→ Version attributes: C—Regular Edition, S—Special Edition (customized version);
△→Backlight color: B—blue, R—red, G—yellow green
E.g:
HTDS-SCR: single button, regular version, red backlight touch module
In the application of large-capacity, high-visibility products such as portable media players and mobile handheld terminals, touch buttons have been widely adopted. Due to its convenient, easy-to-use, fashionable and low-cost advantages, more and more electronic products have begun to switch from traditional mechanical buttons to touch-type buttons.
Existing customer application cases
l Operation panel of range hood;
l Touch switch;
l Hand-held home air environment detector;
l Industrial control equipment keyboard with waterproof function;
l Vehicle-mounted equipment;
l Bluetooth test stand information display.
The HTTM series touch key module has the following characteristics:
1. There are no mechanical parts, no wear, unlimited life, reducing maintenance costs in the future;
2. The sensing part can be placed behind any insulating layer (usually glass or plastic material), and it is easy to make a keyboard that is sealed to the surrounding environment to prevent moisture and water;
3. The panel pattern is arbitrary, the size and shape of the buttons are designed arbitrarily, and the characters, trademarks, and perspective windows are arbitrarily matched to make the overall feeling of the product stronger;
4. Compared with physical buttons, touch buttons are less likely to be damaged;
5. The output of the signal can be adjusted to latch output or level hold output by modifying the resistance on the back (see 3.3.2 for details);
6. 2.7V～ 6V wide voltage input range, 3.3V signal output, can be directly used to drive relays, optocouplers, LED lights and other originals;
7. -30～ 70℃ working temperature range;
8. The touch is sensitive, without lag, delay, flicker and other adverse reactions;
9. Built-in anti-jamming algorithm, with anti-jamming performance.
Pin definition and parameters

HTTM-□◇△
HTTM is the abbreviation of HelTec Touch Model;
□→ Number of keys: S—single key, D—double key, T—three key, F—four built;
◇→ Version attributes: C—Regular Edition, S—Special Edition (customized version);
△→Backlight color: B—blue, R—red, G—yellow green
E.g:
HTDS-SCR: single button, regular version, red backlight touch module
In the application of large-capacity, high-visibility products such as portable media players and mobile handheld terminals, touch buttons have been widely adopted. Due to its convenient, easy-to-use, fashionable and low-cost advantages, more and more electronic products have begun to switch from traditional mechanical buttons to touch-type buttons.
Existing customer application cases
l Operation panel of range hood;
l Touch switch;
l Hand-held home air environment detector;
l Industrial control equipment keyboard with waterproof function;
l Vehicle-mounted equipment;
l Bluetooth test stand information display.
The HTTM series touch key module has the following characteristics:
1. There are no mechanical parts, no wear, unlimited life, reducing maintenance costs in the future;
2. The sensing part can be placed behind any insulating layer (usually glass or plastic material), and it is easy to make a keyboard that is sealed to the surrounding environment to prevent moisture and water;
3. The panel pattern is arbitrary, the size and shape of the buttons are designed arbitrarily, and the characters, trademarks, and perspective windows are arbitrarily matched to make the overall feeling of the product stronger;
4. Compared with physical buttons, touch buttons are less likely to be damaged;
5. The output of the signal can be adjusted to latch output or level hold output by modifying the resistance on the back (see 3.3.2 for details);
6. 2.7V～ 6V wide voltage input range, 3.3V signal output, can be directly used to drive relays, optocouplers, LED lights and other originals;
7. -30～ 70℃ working temperature range;
8. The touch is sensitive, without lag, delay, flicker and other adverse reactions;
9. Built-in anti-jamming algorithm, with anti-jamming performance.
Pin definition and parameters

HTTM-□◇△
HTTM is the abbreviation of HelTec Touch Model;
□→ Number of keys: S—single key, D—double key, T—three key, F—four built;
◇→ Version attributes: C—Regular Edition, S—Special Edition (customized version);
△→Backlight color: B—blue, R—red, G—yellow green
E.g:
HTDS-SCR: single button, regular version, red backlight touch module
In the application of large-capacity, high-visibility products such as portable media players and mobile handheld terminals, touch buttons have been widely adopted. Due to its convenient, easy-to-use, fashionable and low-cost advantages, more and more electronic products have begun to switch from traditional mechanical buttons to touch-type buttons.
Existing customer application cases
l Operation panel of range hood;
l Touch switch;
l Hand-held home air environment detector;
l Industrial control equipment keyboard with waterproof function;
l Vehicle-mounted equipment;
l Bluetooth test stand information display.
The HTTM series touch key module has the following characteristics:
1. There are no mechanical parts, no wear, unlimited life, reducing maintenance costs in the future;
2. The sensing part can be placed behind any insulating layer (usually glass or plastic material), and it is easy to make a keyboard that is sealed to the surrounding environment to prevent moisture and water;
3. The panel pattern is arbitrary, the size and shape of the buttons are designed arbitrarily, and the characters, trademarks, and perspective windows are arbitrarily matched to make the overall feeling of the product stronger;
4. Compared with physical buttons, touch buttons are less likely to be damaged;
5. The output of the signal can be adjusted to latch output or level hold output by modifying the resistance on the back (see 3.3.2 for details);
6. 2.7V～ 6V wide voltage input range, 3.3V signal output, can be directly used to drive relays, optocouplers, LED lights and other originals;
7. -30～ 70℃ working temperature range;
8. The touch is sensitive, without lag, delay, flicker and other adverse reactions;
9. Built-in anti-jamming algorithm, with anti-jamming performance.
Pin definition and parameters

HTTM-□◇△
HTTM is the abbreviation of HelTec Touch Model;
□→ Number of keys: S—single key, D—double key, T—three key, F—four built;
◇→ Version attributes: C—Regular Edition, S—Special Edition (customized version);
△→Backlight color: B—blue, R—red, G—yellow green
E.g:
HTDS-SCR: single button, regular version, red backlight touch module
In the application of large-capacity, high-visibility products such as portable media players and mobile handheld terminals, touch buttons have been widely adopted. Due to its convenient, easy-to-use, fashionable and low-cost advantages, more and more electronic products have begun to switch from traditional mechanical buttons to touch-type buttons.
Existing customer application cases
l Operation panel of range hood;
l Touch switch;
l Hand-held home air environment detector;
l Industrial control equipment keyboard with waterproof function;
l Vehicle-mounted equipment;
l Bluetooth test stand information display.
The HTTM series touch key module has the following characteristics:
1. There are no mechanical parts, no wear, unlimited life, reducing maintenance costs in the future;
2. The sensing part can be placed behind any insulating layer (usually glass or plastic material), and it is easy to make a keyboard that is sealed to the surrounding environment to prevent moisture and water;
3. The panel pattern is arbitrary, the size and shape of the buttons are designed arbitrarily, and the characters, trademarks, and perspective windows are arbitrarily matched to make the overall feeling of the product stronger;
4. Compared with physical buttons, touch buttons are less likely to be damaged;
5. The output of the signal can be adjusted to latch output or level hold output by modifying the resistance on the back (see 3.3.2 for details);
6. 2.7V～ 6V wide voltage input range, 3.3V signal output, can be directly used to drive relays, optocouplers, LED lights and other originals;
7. -30～ 70℃ working temperature range;
8. The touch is sensitive, without lag, delay, flicker and other adverse reactions;
9. Built-in anti-jamming algorithm, with anti-jamming performance.
Pin definition and parameters

HTTM-□◇△
HTTM is the abbreviation of HelTec Touch Model;
□→ Number of keys: S—single key, D—double key, T—three key, F—four built;
◇→ Version attributes: C—Regular Edition, S—Special Edition (customized version);
△→Backlight color: B—blue, R—red, G—yellow green
E.g:
HTDS-SCR: single button, regular version, red backlight touch module
In the application of large-capacity, high-visibility products such as portable media players and mobile handheld terminals, touch buttons have been widely adopted. Due to its convenient, easy-to-use, fashionable and low-cost advantages, more and more electronic products have begun to switch from traditional mechanical buttons to touch-type buttons.
Existing customer application cases
l Operation panel of range hood;
l Touch switch;
l Hand-held home air environment detector;
l Industrial control equipment keyboard with waterproof function;
l Vehicle-mounted equipment;
l Bluetooth test stand information display.
The HTTM series touch key module has the following characteristics:
1. There are no mechanical parts, no wear, unlimited life, reducing maintenance costs in the future;
2. The sensing part can be placed behind any insulating layer (usually glass or plastic material), and it is easy to make a keyboard that is sealed to the surrounding environment to prevent moisture and water;
3. The panel pattern is arbitrary, the size and shape of the buttons are designed arbitrarily, and the characters, trademarks, and perspective windows are arbitrarily matched to make the overall feeling of the product stronger;
4. Compared with physical buttons, touch buttons are less likely to be damaged;
5. The output of the signal can be adjusted to latch output or level hold output by modifying the resistance on the back (see 3.3.2 for details);
6. 2.7V～ 6V wide voltage input range, 3.3V signal output, can be directly used to drive relays, optocouplers, LED lights and other originals;
7. -30～ 70℃ working temperature range;
8. The touch is sensitive, without lag, delay, flicker and other adverse reactions;
9. Built-in anti-jamming algorithm, with anti-jamming performance.
Pin definition and parameters

Product performance:
Standard interface, compatible with various official Arduino controllers
Original FT232 chip, stable performance
With power, sending and receiving indicator lights, working status is clear at a glance
With 3.3V and 5V power supply options
Can be used as ordinary USB to serial port TTL module, download STC MCU
Packing List:
FTDI Basic program downloader 1
【Introduction of FT232R】
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. Many manufacturers have produced such chips, such as the CP210x series of silicon LABS, the TUSB3410 of TI, and the CH34x series of Nanjing Qinheng. FTDI's FT232 series, Prolific's PL230x series, ARK3116, etc. From the standpoint of stability, the FT232 series is still the most reliable. You can use it to debug programs without worrying about the blue screen.
The FT232R chip is a single-chip solution. Generally, peripherals are not required for general use. Even the crystal oscillator, USB matching resistor, and EEPROM for product information have been integrated inside. FT232R also has some more useful functions. For details, please refer to the FT232R data sheet.
Data manual download address: http://www.ftdichip.com/Products/ICs/FT232R.htm
【Hardware Introduction】
·Adopt FT232RL chip of FTDI Company;
· Lead out all signal ports of FT232RL chip, TTL/CMOS level;
·RXD/TXD transceiver communication indicator;
·USB power supply, optional 5V or 3.3V interface level (if you need other levels, you can directly provide the target voltage on the VCC and GND pins).
[Software introduction]
· FT232R windows driver;
·Serial port debugging software.
Driver download interface: http://www.ftdichip.com/Drivers/VCP.htm
Direct download (for x86): http://www.ftdichip.com/Drivers/CDM/CDM20802% 20WHQL% 20Certified.zip

Product introduction:
Power amplifier chip: TPA3110D2
Working voltage: 8～26V DC (power input with polarity protection)
Recommended power supply: 12V DC current 2A
Output power: 2*15W
Recommended speaker impedance: 4 to 10 ohms
With mute interface: MUTE (generally suspended without use)
Specifications: 30mm*39mm, the size of the installation hole is about 3mm, if there is any error in manual measurement, please forgive me