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Large current 5A constant current LED driver lithium-ion battery power supply module
 
 5A constant voltage constant current module
 
When you use this product, the module inputs and outputs to the ground and do not co-together, this will cause the board power current sense resistor is bypassed, so that the module can not adjust the output current size, the case then load easy to burn power chip module.
 
This module is easy to use, powerful! ! !
A module has three major features to meet most of your occasions! ! !
 
Module Description:
1. high power, high efficiency, 5A, low ripple;
2. triple:
(1) Use as a normal blood pressure modules with overcurrent protection capability;
(2) as the various voltage lithium batteries, batteries, nickel-cadmium nickel-metal hydride batteries (battery) charger for solar panels, wind turbines and other occasions;
(3) is used as a high-power LED constant current drive module;
3. With constant pressure and constant current modes, there are light indicates which mode is currently in module;
4. When used as a lithium battery charger, you can set the float voltage and the charge current size, there is light indicates is being charged or has been filled;
5. Has the current limit protection, output short circuit even if it will not burn module.
6. This module uses machine placement, reflow soldering, and each module shipments have been two hours before the aging tests to ensure high reliability.
 
First, the module parameters
Input: IN input positive, IN- input negative
Output way: OUT output positive, OUT- output negative
Input voltage: 4-38V
Output voltage: 1.25-36V continuously adjustable
Output current: adjustable, maximum 5A
Output Power: 75W maximum
Working temperature: -40 to 85 degrees
Operating frequency: 180KHz
Conversion efficiency: up to 96%
Short circuit protection: Yes (limit current 8A)
Overtemperature protection: (automatically shut off the output after overtemperature)
Input reverse polarity protection: None, (if necessary, please enter the string into the high current diode)
Installation: four 3mm screws
Module dimensions: length 51mm width 26mm height 15mm
Weight: 23g
 
Second, the application
1. Use as a normal blood pressure modules with overcurrent protection capability
Instructions:
(1) constant pressure regulator potentiometer, the output voltage reaches the voltage value you want
(2) 10A current with a multimeter measuring the output short circuit current file (directly to the two leads to the output can), while adjusting the constant current potentiometer allows the output current reaches a predetermined value of overcurrent protection. (Such as the current value of the multimeter displays 4A, then you can use the module to the maximum current 4A, 4A current to constant voltage constant current when the red light is on, otherwise the light off)
Note: When used in this state, since the output of 0.05 ohm current sense resistor, there will be 0 ~ 0.3V voltage drop after connected to the load, this is normal! This drop is not being pulled down your load, but down-sampling resistor.
 
2. Use as a battery charger
Module without constant function can not be used to charge the battery, since the end of the battery and charger power consumption big difference between charging current is too large, resulting in damage to the battery, so when you want to start the battery using a constant current charging, when charging to a certain extent automatically switches back to constant voltage charging.
Instructions:
(1) Make sure you need to recharge battery float voltage and charging current; (if lithium argument is 3.7V / 2200mAh, then float voltage is 4.2V, the maximum charging current 1C, namely 2200mA)
(2) under no-load conditions, the multimeter to measure the output voltage of the constant voltage potentiometer to adjust the output voltage reaches the float voltage; (if rechargeable lithium battery to 3.7V, the output voltage can be adjusted to 4.2V)
(3) 10A current with a multimeter measuring the output short circuit current file (directly to the two leads to the output can), while adjusting the constant current potentiometer allows the output current reaches a predetermined charge current value;
(4) Charging turn lamp current default factory setting is 0.1 times the charging current; (the battery during charging current is gradually reduced, gradually converted to constant voltage charging by the constant current charging, if the charging current setting is 1A, then when Charge current is less than 0.1A when the blue light off, green light is on, then the battery is fully charged)
(5) connected to the battery charge.
(1,2,3,4 step is: input termination power, output unloaded battery is not connected)
 
3. Use a high-power LED constant current driver module
(1) determine the work you need to drive the LED current and the maximum operating voltage;
(2) No-load condition, the multimeter to measure the output voltage of the constant voltage potentiometer to adjust the output voltage reaches the LED maximum working voltage;
(3) 10A current with a multimeter measuring the output short-circuit current gear while adjusting the constant current potentiometer allows the output current reaches a predetermined LED working current;
(4) connected to the LED, the test machine.
(Steps 1 through 3 are: input connected to the power supply, the output load is not connected LED.)
 
Note: This module is more than 3A, 35W in use, to enhance heat dissipation! ! !

 Socket Adapter plate Board for 8Pin NRF24L01 Wireless Transceive module 51
 
Wireless module operating voltage is generally 3.3v, while the ordinary 51 microcontroller 5v, this module is easy toshop wireless module with 51 single system board used in conjunction.
This module can be any one of 51 shop is directly connected to the system board, easy to use.
It's for 8 Pin NRF24L01 Module
This is a simple socket board which is for NRF24L01 Wireless module
on-board AMS1117-3.3 chip
It could be used with NRF24L01 Wireless module at our store.
 
 
Package included:
100% Brand New
1PCS x  Socket Adapter Module      

Product Overview
function description:

based on I2C interface of the I/O expansion module, 2 I/O scalable 8 I/O (can be used at the same time up to 8 PCF8574, expanded to 64 input/output (I/O)
main features:

1. Supports two interface type to access the target board: header or seat
2. Support I2C bus cascade (through the header, seat docking simulation,, at the same time using a plurality of I2C module)
typical applications:

the I/O resources in short supply and the MCU I/O expansion
the main resources:

PCF8574,I2C interface 8-bit parallel interface
information includes:

test procedures (AVR, STM8, C8051F)
the circuit schematic diagram
related PDF

I. Overview
The XL7015 DC-DC Buck Module is a high efficiency, high voltage step-down DC-DC converter that provides up to 0.8A output current capability, low ripple, excellent linearity and load regulation, and maximum input voltage 80V, far more than 2596 and other modules. The chip has multiple protection mechanisms built in. Can be applied to electric vehicle controllers, etc.
Second, the functional characteristics
1. 5V to 80V wide input voltage range;
2. The output voltage is adjustable from 5V to 20V;
3. The minimum pressure drop is 1V;
4. The maximum switching current is 0.8A;
5. Recommended output power is less than 7W;
6. Conversion efficiency is 85% ;
7. Built-in thermal shutdown protection, output short circuit protection, over current protection;
8. Excellent linearity and load regulation;
Third, the hardware introduction and description
Board size: 16mm * 44mm;
Wiring instructions:
VIN: voltage input terminal (5V-80V);
GND: input voltage ground;
VOUT: output voltage terminal (5V-20V);
GND: output voltage ground;

8A with LED indicator light parameters description
product description:
Maximum AC voltage input: single 18v
Board size: 50mm*25mm
(8a rectifier bridge) filter capacitor:3300uf/25V (diameter 18mm, height 20mm, pitch 7.5mm) 0.1UF/100v (foot distance 5.0mm)

 
Specification:
1.Two selectable differential input channels
2.On-chip active low noise PGA with selectable gain of 32, 64 and 128
3.On-chip power supply regulator for load-cell and ADC analog power supply
4.On-chip oscillator requiring no external component with optional external crystal
5.On-chip power-on-reset
6.Simple digital control and serial interface: pin-driven controls, no programming needed
7.Selectable 10SPS or 80SPS output data rate
8.Simultaneous 50 and 60Hz supply rejection
9.Current consumption including on-chip analog power supply regulator: normal operation < 1.5mA, power down < 1uA
10.Operation supply voltage range: 2.6 ~ 5.5V
11.Operating Temperature Range:-20 degree ~ 85 degree

Material: Electronic components PCB
Size: About 31 * 19 * 29mm / 1.22" * 0.75" * 1.14"
Main color: Black
Working voltage: 5V
Pulse circle: 20

M3 core board

his induction heating board has a maximum power of 1800W, with super PCB layout design and super heat sink. It could work continuously under the condition of good heat dissipation due to superior heat dissipation effect. 
Features:
Maximum power is 1800W, heating evenly, fast and very convenient.
12-48V low voltage DC power supply with a maximum current of 40A.
With a cooling fan interface, can also do Tes-la discharge, generator voltage inverter, etc.
Adopts PCB layout design and qualified heat sink with great heat dissipation.
Can use graphite crucible to melt gold, silver, copper, aluminum and other metals.
Specifications:
Input: 12-48V
Max. power: 1800W
Max. current: 40A
Heater circle inner: 70mm / 2.76in
Item size: 185 * 90 * 85mm / 7.28 * 3.54 * 3.35in
Package size: 300 * 140 * 120mm / 11.81 * 5.51 * 4.72in
Item weight: 879g / 1.94pounds
Package weight: 1107g / 2.44pounds
Note:
1. When using a switching power supply, make sure that the power supply voltage is stable before connecting to the induction heating circuit.
2. Do not heat metal that is too large or it may be overloaded. Please add a 35A fuse or ammeter.
3. Although this driver board can withstand more than 40A, it is recommended not to exceed 48V 35A to prevent accidents and damage.
4. The minimum input voltage of the module is 12V, the voltage of 12V must be greater than 10A to use the power supply.
5. If you find that the MOS tube is hot, first consider whether the power output meets the requirements.
6. Do not clear the circuit board, otherwise it will emit a very high frequency of noise, and then the MOS tube will burn out.
7. It is recommended to use a 36V 20A power supply. Below 12V is very dangerous.
Package List:
1 * PCB Board
1 * Copper Tube

support:
Raspberry Pi:
Support for Raspbian, no drive
Support Ubuntu/Kali/Win10 IoT, no drive
Support Retropie, drive free
Computer: Support Windows 10/8.1/8/7, no drive
Product parameters:
Display size: 7 inches
Interface: HDMI
Resolution: 1024×600
Panel: TFT
Visual Angle: Horizontal 150°/ Vertical 150°
Touch type: capacitive
Interface: USB
Support backlight control, no damage to eyes, more energy saving
Product list:
1X touch screen
1 x copper column package

Product introduction
Carbon dioxide is a key indicator of indoor air quality, damaging human cognitive ability and happiness. SCD40 is the next generation of micro carbon dioxide sensor of Sensirion. SCD40 has high precision and high cost performance. The module leads out the power supply and communication pins with a 2.54mm spacing pin interface. On chip temperature and humidity compensation realizes humidity and temperature measurement through built-in temperature and humidity sensor. SCD40 can realize intelligent regulation of indoor ventilation system according to carbon dioxide concentration. Indoor air quality helps to maintain a healthy and efficient environment under low carbon dioxide concentration for a period of time.
features
Reference accuracy, specified range 400-2000 ppm
Supply voltage range: 2.4 – 5.5 V
High accuracy: ± (40 ppm 5% )
Digital I2C interface
Integrated temperature and humidity sensor
Low power operation to < 0.4 Ma average @ 5 V, 1 meas/ 5 minutes
Interface definition:
1. GND: negative input port of power supply
2. VDD: positive input port of power supply
3. SCL: I2C clock port
4. SDA: I2C data port
Board size: 13.4 × 21.6mm

Product introduction
Carbon dioxide is a key indicator of indoor air quality, damaging human cognitive ability and happiness. SCD40 is the next generation of micro carbon dioxide sensor of Sensirion. SCD40 has high precision and high cost performance. The module leads out the power supply and communication pins with a 2.54mm spacing pin interface. On chip temperature and humidity compensation realizes humidity and temperature measurement through built-in temperature and humidity sensor. SCD40 can realize intelligent regulation of indoor ventilation system according to carbon dioxide concentration. Indoor air quality helps to maintain a healthy and efficient environment under low carbon dioxide concentration for a period of time.
features
Reference accuracy, specified range 400-2000 ppm
Supply voltage range: 2.4 – 5.5 V
High accuracy: ± (40 ppm 5% )
Digital I2C interface
Integrated temperature and humidity sensor
Low power operation to < 0.4 Ma average @ 5 V, 1 meas/ 5 minutes
Interface definition:
1. GND: negative input port of power supply
2. VDD: positive input port of power supply
3. SCL: I2C clock port
4. SDA: I2C data port
Board size: 13.4 × 21.6mm

Specifications:
Model: 756156
Name: ZVS Board
Material: Plastic,Metal
Voltage: DC12V-30V
Max. Current: 20A
Max. Power: 1000W
Size: 69 x 85 x 30mm
Package Included:
1 * Low Voltage Induction Board Heating Module
Note:
1. The kit contains a full set of driving circuit elements and brass
2. Buyers need to bring their own power and cooling unit.
3. The circuit board using double-sided fiberglass board, mainly copper traces are used to widen
Use the entire back surface of the resonant circuit common,
Continuous work, please add a fan to blow down from above,
To the resonance capacitors and other components cool.
4. The use of switching power supply Please note that due to high power are generally slow start function,
which just opened machine output voltage is slowly rising,while it is turned on before the induction heating circuit if the voltage rises to 12V,because start insufficient voltage can not afford to vibration,resulting in two simultaneous conduction mos tube so burned components.
So the first will start switching power supply voltage reaches 12V above and then access the induction heating circuit.
5. The volume of the object being heated inside the heating coil can not exceed 1/5 of the volume
(if the heating cylinder, then heating coil diameter less than the diameter of 1/3),or it may be due to overload or burn out the power supply to the circuit.
Although this circuit can tolerate 20-30A input current moment, but do not exceed 15A when safe work,
you can easily add an ammeter between the power supply and heating driver board but always monitor the current

Specifications:
Model: 756156
Name: ZVS Board
Material: Plastic,Metal
Voltage: DC12V-30V
Max. Current: 20A
Max. Power: 1000W
Size: 69 x 85 x 30mm
Package Included:
1 * Low Voltage Induction Board Heating Module
Note:
1. The kit contains a full set of driving circuit elements and brass
2. Buyers need to bring their own power and cooling unit.
3. The circuit board using double-sided fiberglass board, mainly copper traces are used to widen
Use the entire back surface of the resonant circuit common,
Continuous work, please add a fan to blow down from above,
To the resonance capacitors and other components cool.
4. The use of switching power supply Please note that due to high power are generally slow start function,
which just opened machine output voltage is slowly rising,while it is turned on before the induction heating circuit if the voltage rises to 12V,because start insufficient voltage can not afford to vibration,resulting in two simultaneous conduction mos tube so burned components.
So the first will start switching power supply voltage reaches 12V above and then access the induction heating circuit.
5. The volume of the object being heated inside the heating coil can not exceed 1/5 of the volume
(if the heating cylinder, then heating coil diameter less than the diameter of 1/3),or it may be due to overload or burn out the power supply to the circuit.
Although this circuit can tolerate 20-30A input current moment, but do not exceed 15A when safe work,
you can easily add an ammeter between the power supply and heating driver board but always monitor the current

https://gitee.com/seekfree。

https://gitee.com/seekfree。

Hardware resources
1,STM32F103RCT6, TOFP64 FLASH: 256K, RAM: 48K
2, a standard SWD download port
3, a power indicator
4, two status indicators
5, a SP FLASHI chip, W25X16, the capacity is 2M bytes
6, an EEPROMI chip, 24c02
7, one way MINIUSB interface, can supply power to the system version, reserve USB communication function
8, a boot mode configuration interface
9, all the way min IUSB interface, you can supply power to the system version, realize (ISP) one-click download Features
10. A 32.768 crystal oscillator for use with the built-in RTG or for calibration
11, a reset button, can be used to reset MCU and 이 LED
12, three function button buttons, of which WK_UP has a wake-up function
13, 8M crystal oscillator (through the chip internal PL up to 72M)
14, LM1117 ~ -3.3V regulator chip, the maximum supply of 800mA current
15, port expansion pin 13x2 2 road
16, a TFT1.44 LCD screen or 이 LED screen module interface
17, 3.5m positioning holes for 17 and 4 weeks
Software resources:
1,KeilsoftwareMDK
2, Supporting test samplesCprogram
3, Supporting chip information
4, Circuit diagram
5,user's Guide
6, AttachedARMLearning materials
Shipping list:
1, STM32F103RCT6 system board 1
2, power supply mini-USB line 1
3, function extension connection DuPont line 10

16-Bit Remote Bidirectional I/O Port:
- I/O pins default to input
• High-Speed I2C Interface (MCP23017):
- 100kHz
- 400kHz
- 1.7MHz
• High-Speed SPI Interface (MCP23S17):
- 10 MHz (maximum)
• Three Hardware Address Pins to Allow Up to
Eight Devices On the Bus
• Configurable Interrupt Output Pins:
- Configurable as active-high, active-low or
open-drain
• INTA and INTB Can Be Configured to Operate
Independently or Together
• Configurable Interrupt Source:
- Interrupt-on-change from configured register
defaults or pin changes
• Polarity Inversion Register to Configure the
Polarity of the Input Port Data
• External Reset Input
• Low Standby Current: 1 μA (max.)
• Operating Voltage:
- 1.8V to 5.5V @ -40°C to 85°C
- 2.7V to 5.5V @ -40°C to 85°C
- 4.5V to 5.5V @ -40°C to 125°C

16-Bit Remote Bidirectional I/O Port:
- I/O pins default to input
• High-Speed I2C Interface (MCP23017):
- 100kHz
- 400kHz
- 1.7MHz
• High-Speed SPI Interface (MCP23S17):
- 10 MHz (maximum)
• Three Hardware Address Pins to Allow Up to
Eight Devices On the Bus
• Configurable Interrupt Output Pins:
- Configurable as active-high, active-low or
open-drain
• INTA and INTB Can Be Configured to Operate
Independently or Together
• Configurable Interrupt Source:
- Interrupt-on-change from configured register
defaults or pin changes
• Polarity Inversion Register to Configure the
Polarity of the Input Port Data
• External Reset Input
• Low Standby Current: 1 μA (max.)
• Operating Voltage:
- 1.8V to 5.5V @ -40°C to 85°C
- 2.7V to 5.5V @ -40°C to 85°C
- 4.5V to 5.5V @ -40°C to 125°C

Introduced the industry's smallest 16-bit - ADC (ADC), the converter integrates a programmable gain amplifier (PGA), a reference voltage, a temperature sensor and 4-input multiplexer. The ADS1118 measures only 2 mm x 1.5 mm, compared with the industry's existing ADC other than the same type of 16 to 65% smaller. In the range of 0 degrees C to 65 degrees C temperature range, ADS1118 can ensure the realization of the direct linear measurement of less than 0.5 degrees Celsius uncalibrated error, compared with competing solutions, the performance of the sharp rise of 75% . In addition, it called the industry's lowest power 16-bit ADC, supports built-in internal reference, can support up to 860 samples per second data rate.

If you need a USB cable, the shop has a link for the USB cable

Product features:
 
-LCD control IC SSD1289 or ILI9341, touch panel controller XPT2046; default SSD1289
-Adopt industrial TFT LCD modules;
High-grade gold-plated double yellow-module pin, better electrical properties;
-Compatible with all hot Atom development boards, straight into the straight;
-Application is fully open source;
-Bottom-driven technical support LCD, a transaction, is a friend forever;
 
 
Hardware resources:
 
-3.2 inch, 240*320 resolution, TFT touch screen;
-Display driver IC SSD1289/ILI9341, touch screen driver for XPT2046;
16bit-display interface parallel interface, support for 6800 and 8080 bus interface supports STM32 FSMC bus interface, crowding the screen faster;
-Touch screen interface for the SPI interface, so that the line less, driving is simple;
-Onboard-a large current LDO voltage regulator, 5V and 3.3V power supply;
-Onboard PWM backlight control circuit to support IO control and PWM dimming control;
-Modules with SD cards, digital photo frames and other experiments can be done;
-Reserved SPI FLASH pad, you can extend the welded fonts chips;
-Supports landscape and portrait displays, support split the screen display;
-Support for 262,000-color RGB display and displayed good quality;
-Graphic display of the screen controller with internal 172800 byte data storage;
Punctuality Atom-interface compatible series of interface Development Board;
Patch-machine production, stable and reliable hardware;
 
Software resources:
 
-C51 monolithic integrated circuit testing source code;
-STM32 test source code;
 
Supporting other resources:
 
-Module design principle;
-LCD controller data manual;
-XPT2046 data sheet;
-Module schematic diagram;
-Module dimensions;
-LCD package;
MOD software-text;
-Picture taking mode software;
-C51 code wiring tutorial;
-STM32 code wiring tutorial;
 
Optional model:
 
-ILI9341 drive (recommended)
 
-SSD1289 drive

Product features:
 
-LCD control IC SSD1289 or ILI9341, touch panel controller XPT2046; default SSD1289
-Adopt industrial TFT LCD modules;
High-grade gold-plated double yellow-module pin, better electrical properties;
-Compatible with all hot Atom development boards, straight into the straight;
-Application is fully open source;
-Bottom-driven technical support LCD, a transaction, is a friend forever;
 
 
Hardware resources:
 
-3.2 inch, 240*320 resolution, TFT touch screen;
-Display driver IC SSD1289/ILI9341, touch screen driver for XPT2046;
16bit-display interface parallel interface, support for 6800 and 8080 bus interface supports STM32 FSMC bus interface, crowding the screen faster;
-Touch screen interface for the SPI interface, so that the line less, driving is simple;
-Onboard-a large current LDO voltage regulator, 5V and 3.3V power supply;
-Onboard PWM backlight control circuit to support IO control and PWM dimming control;
-Modules with SD cards, digital photo frames and other experiments can be done;
-Reserved SPI FLASH pad, you can extend the welded fonts chips;
-Supports landscape and portrait displays, support split the screen display;
-Support for 262,000-color RGB display and displayed good quality;
-Graphic display of the screen controller with internal 172800 byte data storage;
Punctuality Atom-interface compatible series of interface Development Board;
Patch-machine production, stable and reliable hardware;
 
Software resources:
 
-C51 monolithic integrated circuit testing source code;
-STM32 test source code;
 
Supporting other resources:
 
-Module design principle;
-LCD controller data manual;
-XPT2046 data sheet;
-Module schematic diagram;
-Module dimensions;
-LCD package;
MOD software-text;
-Picture taking mode software;
-C51 code wiring tutorial;
-STM32 code wiring tutorial;
 
Optional model:
 
-ILI9341 drive (recommended)
 
-SSD1289 drive

IV Conversion Amplifier Voltage Signal Amplification Photoelectric Amplifier Module Current to Voltage Transmitter Following

Ethernet W5100 network expansion module, can become a simple Web server or a network control to read and write digital and analog interface and other network applications. IDE can be used directly in the Ethernet library files can be achieved with a simple Web server.
Meanwhile, the version supports mini SD card (TF card) reader
The expansion board uses a stackable design, it can be directly plugged into the , while our other expansion boards can also plug in to.
Code:
/ *
* Web Server
*
* A simple web server that shows the value of the analog input pins.
* /
#include
byte mac [] = {0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED};
byte ip [] = {192, 168, 0, 15};
Server server (80);
void setup ()
{
Ethernet.begin (mac, ip);
server.begin ();
}
void loop ()
{
Client client = server.available ();
if (client) {
// An http request ends with a blank line
boolean current_line_is_blank = true;
while (client.connected ()) {
if (client.available ()) {
char c = client.read ();
// If we've gotten to the end of the line (received a newline
// Character) and the line is blank, the http request has ended,
// So we can send a reply
if (c == '\ n' && current_line_is_blank) {
// Send a standard http response header
client.println ( "HTTP / 1.1 200 OK");
client.println ( "Content-Type: text / html");
client.println ();
         
// Output the value of each analog input pin
client.print ( "welcome to tinyos");
client.println ( "
");
client.print ( "// *************************************");
client.println ( "
");
client.print (www.tinyos.net.cn);
client.println ( "
");
client.print ( "// *************************************");
client.println ( "
");
for (int i = 0; i
client.print ( "analog input");
client.print (i);
client.print ( "is");
client.print (analogRead (i));
client.println ( "
");
}
break;
}
if (c == '\ n') {
// We're starting a new line
current_line_is_blank = true;
} Else if (c! = '\ R') {
// We've gotten a character on the current line
current_line_is_blank = false;
}
}
}
client.stop ();
}
}

PCB size: 63X71 mm weight: about 48g
LCR-T4 graphical multi function tester resistance capacitance diode SCR inductor transistor mos
LCD 12864 LCD display, with a backlight, backlight color is generally yellow green.
Power supply for 9V stacked battery. If long time power supply, can use 2 lithium battery composition 8.4v battery power supply.
function
* added boot voltage detection function
* automatic detection of NPN and PNP transistors, N channel and P channel MOSFET, diodes (including dual diode), thyristor, transistors, resistors and capacitors and other components,
* automatically test the pin of the element and display it on the LCD.
* the positive bias voltage of the emitter transistor can be determined by detecting the amplification factor and the base of the transistor, the MOSFET protection diode, etc.
* measurement of gate threshold voltage and gate capacitance of MOSFET
* display using 12864 LCD LCD (128 * 64 characters)
* higher test speed, effective component test: in 2 seconds (except for the larger capacitor, the measurement of large capacitance also takes a long time to measure the time for 1 minutes is normal).
* a key operation, the boot test, a key to get.
* power consumption off mode: less than 20 nA
* automatic shutdown function, you can avoid unnecessary waste, save battery energy, improve the life time.

Overview:
       CH32V305/7 series is an interconnected microcontroller based on 32-bit RISC-V design, equipped with hardware stack area and fast interrupt entry, which greatly improves the interrupt response speed on the basis of standard RISC-V. Add single-precision floating-point instruction set, expand the stack area, and have higher computing performance. Expand the number of serial U(S)ART to 8 groups, and the motor timer to 4 groups. Provide USB2.0 high-speed interface (480Mbps) and built-in PHY transceiver, Ethernet MAC upgrade to Gigabit and integrated 10M-PHY
Main control MCU features:
> RISC-V4F processor, up to 144MHz system frequency
> Supports single-cycle multiplication and hardware division, supports hardware floating-point operations (FPU)
> 64KB SRAM, 256KB Flash
> Power supply voltage: 2.5/3.3V, independent power supply for GPIO unit
> Multiple low power modes: sleep, stop, standby
> Power-on/power-off reset, programmable voltage detector
> 2 groups of 18 general-purpose DMAs
> 4 groups of op amp comparators
> 1 random number generator TRNG
> 2 groups of 12-bit DAC conversion
> 2-unit 16-channel 12-bit ADC conversion, 16-channel TouchKey
> 10 timers
> USB2.0 full speed OTG interface
> USB2.0 high-speed host/device interface (480Mbps built-in PHY)
> 3 USART ports and 5 UART ports
> 2 CAN interfaces (2.0B active)
> SDIO interface, FSMC interface, DVP digital image interface
> 2 groups of IIC interfaces, 3 groups of SPI interfaces, 2 groups of IIS interfaces
> Gigabit Ethernet Controller ETH (Built-in 10M PHY)
> 80 I/O ports, which can be mapped to 16 external interrupts
> CRC calculation unit, 96-bit chip unique ID
> Serial 2-wire debug interface

MCU FT232H High Speed Multifunction USB to JTAG UART/FIFO IIC I2C Module External Memory
Typical Applications
? Single chip USB to UART (RS232, RS422 or RS485)
?USB to FIFO
?USB to FT1248
?USB to JTAG
?USB to SPI
?USB to I2C
?USB to Bit-Bang
?USB to Fast Serial Interface
? USB to CPU target interface (as memory)
CJMCU-FT232H is a single channel USB 2.0 Hi-Speed (480Mb/s) to UART/FIFO IC. It has the capability of being configured in a variety of industry standard serial or parallel interfaces. The FT232H has the following advanced features:
? Single channel USB to serial / parallel ports with a variety of configurations.
? Entire USB protocol handled on the chip. No USB specific firmware programming required.
? USB 2.0 Hi-Speed (480Mbits/Second) and Full Speed (12Mbits/Second) compatible.
? Multi-Protocol Synchronous Serial Engine (MPSSE) to simplify synchronous serial protocol (USB to JTAG, I2C, SPI (MASTER) or bit-bang) design.
? UART transfer data rate up to 12Mbaud. (RS232 Data Rate limited by external level shifter).
? USB to asynchronous 245 FIFO mode for transfer data rate up to 8 Mbyte/Sec.
?USB to synchronous 245 parallel FIFO mode for transfers upto 40 Mbytes/Sec
? Supports a proprietary half duplex FT1248 interface with a configurable width, bi-directional data bus (1, 2, 4 or 8 bits wide).
? CPU-style FIFO interface mode simplifies CPU interface design.
? Fast serial interface option.
? FTDI’s royalty-free Virtual Com Port (VCP) and Direct (D2XX) drivers eliminate the requirement for USB driver development in most cases.
? Adjustable receive buffer timeout.

Power protection Overload, short circuit, overvoltage protection are all available
Voltage input AC110~245V
Frequency input 50HZ~60HZ
Output voltage DC24V
Output current rated 9A/peak 12A protection
Output power 220W
Overall size length 12.5CM* width 6.56CM* height 3.3CM

Support GB2312, GBK, BIG5 and UNICODE internal code format text;
*Clear, natural and accurate Chinese speech synthesis effect; can synthesize any Chinese text, support the synthesis of English letters;
*With intelligent text analysis and processing algorithms, it can correctly identify values, numbers, time and date, and commonly used weights and measures symbols;
* Possess strong polyphonic word processing and Chinese surname processing capabilities;
*Support multiple text control marks to improve the accuracy of text processing;
*The amount of text synthesized each time can be up to 200 bytes;
*Support a variety of control commands, including: synthesis, stop, pause synthesis, continue synthesis, change baud rate, etc.;
*Support sleep function, can reduce power consumption in sleep state; support multiple ways to query chip working status;
*Support serial data communication interface, support three kinds of communication baud rate: 9600bps, 19200bps, 38400bps;
*Support 16-level volume adjustment; the foreground volume of playing text and the background volume of playing background music can be controlled separately;
*You can adjust the speed of words by sending control marks, and support 6-level word speed adjustment;
*Multiple chord music, prompt sound effects and common voice prompts for certain industries are solidified in the chip;
*Internally integrated 19 voice prompts, 23 chord prompts, 15 background music;
*The final product provides SSOP chip packaging; the volume is the smallest in the industry;
*All indicators of the chip meet the application in harsh outdoor environment;
Application:
◆ On-board information terminal voice broadcast, on-board dispatch, on-board navigation
◆ Bus stop announcer, attendance machine
◆ Mobile phones, fixed phones
◆Line calling machine, cash register charging machine
◆Vending machines, information machines, POS machines
◆ Intelligent instrumentation, weather warning machine, intelligent transformer
◆ Smart toys, smart watches
◆Electric bicycle, rotating advertising light box
◆ Audio electronic book, color screen story book, audio electronic dictionary, audio electronic guide
◆ Short message broadcast, news broadcast
◆ Electronic map
Instructions:
Computer-based application method: You need to purchase a USB to TTL debugging tool, connect it to the speech synthesis module and insert it into the computer, open the supporting software, enter the corresponding text and select the port, and click Synthesize to play the sound of the corresponding text.
Application method between MCU: MCU needs to have a serial port, use the matching program to modify and transplant the program corresponding to the MCU, the communication format is: "5 bytes frame header text", that is, send the corresponding text through the serial port of the MCU The content and text correspond to the calculated frame header. . . The frame header is about the length of the text, decoding format and other information.
1. This module has a standard 3.5mm standard audio interface, which can be plugged in audio and power amplifier equipment. The reserved speaker interface can directly drive 8 ohm 0.5W speakers.
2. The module input voltage can choose any power input of 3-5V, and the serial communication operation is simple. The baud rate can choose 3 communication levels, including: 9600, 19200, 38400bit/s.
3. Input the Chinese characters to synthesize the corresponding audio, output the sound through the audio output interface, use real human pronunciation, add background music function, multiple system sounds, just send the relevant instruction format to complete.

STC16F open source library: https://mp.weixin.qq.com/s/sLppEqDF1nbeoMkj8QUDxw

Battery Energy Storage Spot Welding Machine DIY Portable Small PCB Circuit Board Welding Equipment 8 Gear Adjustable For 18650
8 gears with display, 5 gears without display
5 gears
The main parameters:
Power requirements: Spot welding uses the principle of rapid local heating and cooling with high current, and requires sufficient current supply. Generally, the current of 0.1-0.15 nickel-plated sheet welding is about 90-150A, so the working power supply of the circuit board must be greater than or equal to 150A.
Parameter:
Power supply voltage: 12V-15V
Working current: 100-200A
Note: It will not work if it is discharged below 100A.
A battery with a large discharge current will directly affect the welding effect.
Instructions for use:
Welding is an engineering discipline. Spot welding is affected by factors such as pulse time, welding angle, strength, and flatness of the welding surface, and the effect will vary.
When spot welding, just place the soldering pen on the nickel sheet lightly. Do not use force to press the soldering pen. The distance between the two soldering pins is a little closer. If the solder joint becomes black, lower the gear, and if the molten pool is too small, increase the gear.
Use blades, stainless steel bowls and other iron and stainless steel with larger surfaces before welding, and then weld the battery after familiarizing yourself with the operation.
Instructions for use:
Welding is an engineering discipline. Spot welding is affected by factors such as pulse time, welding angle and strength, and the flatness of the welding surface. The effect will be different.
When spot welding, just place the soldering pen on the nickel sheet lightly. Do not use force to press the soldering pen. The welding distance of the two soldering pins is a little closer. If the solder joint is black, lower the gear, and if the molten pool is too small, increase the gear. Before welding, use blades, stainless steel bowls and other iron and stainless steel with large surfaces to try first, and then weld the battery after familiarizing yourself with the operation.
Describe:
Interface definition: Please strictly follow the instructions for wiring, wrong connection can cause the circuit board to burn out
Function keys: used to switch the machine and switch gears
Long press the function button to boot, and default to the first gear, press and hold the function button for 2 seconds to release, the gear will increase by one gear, and the buzzer will sound the number of times the LED flashes corresponding to the gear.
Example: In gear 3, the buzzer sounds 3 times and the LED flashes 3 times.
There are 5 gears in total, from the 1st gear to the 5th gear, the spot welding strength is gradually strengthened, and the 5th gear is the strongest. After the 5th gear, press and hold the function key to shut down.
Note: The buzzer needs to be installed by the user. If it is not installed, it will not affect the welding.
Features:
1. Portable, stable, reliable and durable. Can be used for welding 18650/26650/32650 and other lithium batteries
2. The MOS tube driving part is thickened up and down, and copper bars are added to greatly reduce the resistance and increase the overcurrent capability
3. Add 4 screw holes for easy installation or fixation of the shell
4. Some circuits have been adjusted to make the layout of the circuit board more reasonable and beautiful
5. Some circuits have been adjusted to make the circuit board layout more reasonable and beautiful
List:
Soldering pen*2
Input wire*2
Circuit board *1
Screw set*4
Heat shrinkable tube*2
Nickel sheet*1
8 gears
Features
1: 8-speed intelligent digital display spot welding machine
2: Super thick copper tube
3: Pure copper conducts heat conduction, which greatly improves spot welding efficiency
4: Bilateral outgoing line, easy to spot welding, Chinese label, not easy to connect wrong
5: Simple to use
MOS core operating temperature: 175°C
Vds: Withstand voltage up to 40V
Rds(on): The internal resistance of a single chip is as low as 0.77mR
ld: Single over-current capability 300A
Precautions:
1. After the system is powered on, the digital tube displays 0, and welding is not possible at this time. You need to adjust the output power (1-8 gears) by pressing the button.
⒉It is recommended that the power supply voltage is 7V-16V, and the working current is 100-300A. Exceeding this range may damage the control board.
Checklist：
1*Mini small portable spot welding machine kit

Battery Energy Storage Spot Welding Machine DIY Portable Small PCB Circuit Board Welding Equipment 8 Gear Adjustable For 18650
8 gears with display, 5 gears without display
5 gears
The main parameters:
Power requirements: Spot welding uses the principle of rapid local heating and cooling with high current, and requires sufficient current supply. Generally, the current of 0.1-0.15 nickel-plated sheet welding is about 90-150A, so the working power supply of the circuit board must be greater than or equal to 150A.
Parameter:
Power supply voltage: 12V-15V
Working current: 100-200A
Note: It will not work if it is discharged below 100A.
A battery with a large discharge current will directly affect the welding effect.
Instructions for use:
Welding is an engineering discipline. Spot welding is affected by factors such as pulse time, welding angle, strength, and flatness of the welding surface, and the effect will vary.
When spot welding, just place the soldering pen on the nickel sheet lightly. Do not use force to press the soldering pen. The distance between the two soldering pins is a little closer. If the solder joint becomes black, lower the gear, and if the molten pool is too small, increase the gear.
Use blades, stainless steel bowls and other iron and stainless steel with larger surfaces before welding, and then weld the battery after familiarizing yourself with the operation.
Instructions for use:
Welding is an engineering discipline. Spot welding is affected by factors such as pulse time, welding angle and strength, and the flatness of the welding surface. The effect will be different.
When spot welding, just place the soldering pen on the nickel sheet lightly. Do not use force to press the soldering pen. The welding distance of the two soldering pins is a little closer. If the solder joint is black, lower the gear, and if the molten pool is too small, increase the gear. Before welding, use blades, stainless steel bowls and other iron and stainless steel with large surfaces to try first, and then weld the battery after familiarizing yourself with the operation.
Describe:
Interface definition: Please strictly follow the instructions for wiring, wrong connection can cause the circuit board to burn out
Function keys: used to switch the machine and switch gears
Long press the function button to boot, and default to the first gear, press and hold the function button for 2 seconds to release, the gear will increase by one gear, and the buzzer will sound the number of times the LED flashes corresponding to the gear.
Example: In gear 3, the buzzer sounds 3 times and the LED flashes 3 times.
There are 5 gears in total, from the 1st gear to the 5th gear, the spot welding strength is gradually strengthened, and the 5th gear is the strongest. After the 5th gear, press and hold the function key to shut down.
Note: The buzzer needs to be installed by the user. If it is not installed, it will not affect the welding.
Features:
1. Portable, stable, reliable and durable. Can be used for welding 18650/26650/32650 and other lithium batteries
2. The MOS tube driving part is thickened up and down, and copper bars are added to greatly reduce the resistance and increase the overcurrent capability
3. Add 4 screw holes for easy installation or fixation of the shell
4. Some circuits have been adjusted to make the layout of the circuit board more reasonable and beautiful
5. Some circuits have been adjusted to make the circuit board layout more reasonable and beautiful
List:
Soldering pen*2
Input wire*2
Circuit board *1
Screw set*4
Heat shrinkable tube*2
Nickel sheet*1
8 gears
Features
1: 8-speed intelligent digital display spot welding machine
2: Super thick copper tube
3: Pure copper conducts heat conduction, which greatly improves spot welding efficiency
4: Bilateral outgoing line, easy to spot welding, Chinese label, not easy to connect wrong
5: Simple to use
MOS core operating temperature: 175°C
Vds: Withstand voltage up to 40V
Rds(on): The internal resistance of a single chip is as low as 0.77mR
ld: Single over-current capability 300A
Precautions:
1. After the system is powered on, the digital tube displays 0, and welding is not possible at this time. You need to adjust the output power (1-8 gears) by pressing the button.
⒉It is recommended that the power supply voltage is 7V-16V, and the working current is 100-300A. Exceeding this range may damage the control board.
Checklist：
1*Mini small portable spot welding machine kit

This converter is TTL level: no external voltage is required, it directly supports 3.3V, 1.8V and 5V (other desired level voltages can also be input externally, such as 2.5V 2.8V 3.0V, etc.)
The converter 6-pin interface signal is defined as the commonly used CTS RTS RXD TXD GND VCC
6-pin connector, all signal levels are 3.3V, 1.8V and 5V, jumper cap selectable
Note: Friends who need to support Arduino download can open the shell and configure it according to the label (requires desoldering resistance)! !
The converter can be configured by adjusting the 0R resistor inside the converter as:
1. Output the DTR signal and share the pin with the CTS signal. At this time, the CTS pin signal is DTR (mainly for Arduino download).
2. It can be directly connected to other types of voltage, such as 2.8V, and the output TTL level is 2.8V (the level selection jumper cap needs to be removed).
In general, it is enough to connect RXD, TXD, and GND three wires, and VCC is not connected when the target board does not need the power supply of the converter.
Test on receipt of goods:
After receiving the goods, please do the test as soon as possible. Self-test method: first short-circuit RXD TXD, then send data to the port through the serial port assistant, RXD will receive the data sent by TXD, and display it in the data receiving area of the serial port assistant . This process is often referred to as loopback testing, or the self-receiving of serial lines. (After purchase, you can ask the customer service for our dedicated serial port test software)
If the test fails, it needs to be reported to the customer service as soon as possible. If the product has been received for more than 7 days, we default the product has passed the test.
Some guests did not do self-test before using it, and then the product was damaged due to improper use. It is not because the product has problems. In this case, we will not bear the consequences. Please be aware of it~
Our products are produced in batches by machine patch, and each product has been strictly tested before leaving the factory. It is impossible for several products to be unusable at the same time, unless the product is damaged due to improper use.
FT232RL is an original imported chip. It adopts the chip of the batch in 2021, WIN8.1 WIN10 64-bit, no pressure, no PID problem! Industrial grade operating temperature: -40°C to 85°C
True 5V/3.3V/2.8V/1.8V CMOS IO, support 1.8V TTL level
Supports baud rates up to 3Mbps
Supports Virtual Com Port (VCP) and Direct (D2XX) drivers
Internal integrated 1024bit EEPROM, support customization

Description:
Model Number: UNO WiFi-R3-AT328-ESP8266-32MB-CH340G
is_customized: Yes
Supply Voltage: 6~9V recommind
Type: Logic ICs
Condition: New
MCU: ATmega328
WiFi MCU: ESP8266
USB-converter: CH340G
PinOut Uno: Uno R3
UNO WiFi R3 ATmega328P ESP8266 (32Mb memory), USB-TTL CH340G. Compatible for Arduino Uno, NodeMCU, WeMos ESP8266
Package Included:
1PC*UNO WiFi R3 ATmega328P ESP8266 (32Mb memory) USB-TTL CH340G For NodeMCU

Description:
 
The intelligent controller includes an SD card reader, rotary encoders and a 20-character ×
 
4 line LCD display. You can easily connect it to your RAMPS 1.4 board using "smart
 
adapter" included.
This panel connect your RAMPS 1.4, you do not need your computer, your SD card
 
intelligent controller power supply. All further operations, such as calibration, the axis
 
movement can be done only with a rotary encoder intelligent controller. 3D design print
 
without a computer, just use the G code design stored on the SD card.
 
 
 
 
 
Package Included:
 
 
1 X 12864 LCD
1 X Smart Adapter
2 X Cable for 30cm

Product description:
100% brand new and high quality
TDA7492 digital power amplifier chip, design optimization, circuit design, sound quality is very good, big power.
DIP switching amplifiers can be adjusted directly after gain more respect and promote greater damping cushion.
standard:
Power supply: 2.1 interface, 8 ~ 25V DC power supply
Audio input: stereo input and various versions of the Bluetooth connection, using Bluetooth chip CSR8635, Bluetooth V4.0, software compatibility high
Output impedance: 8 ohms (best 4,6,8,16 ohm impedance can drive the speaker)
Output power: join of 5532, output power of foot (25V supply, 6 ohm output impedance of 2 * 50W, 8 ohm output impedance 2X40W dual channel), dial switch can be directly adjusted power amplifier gain more convenient, better promote greater horn of damping
Method of use: connect the power and wait 3 seconds, until the LED blue light and red light flashing alternately, then you can use your device to find my Bluetooth module, you will find SANWU audio ", and then connect it, then you can use memory to automatically connect directly.
Material: PCB
Color: Red
Size: 18.3cmX5cmX2.3 cm (LXWXH)
Number: 1
Net weight: 40g
Note: lighting, display and other factors may cause color, please of pictures and text descriptions to determine.
===============================================
Item Description
Features:
100% Brand New and High Quality
TDA7492 digital amplifier chip, designed to optimize the circuit layout, the sound quality is very good, big power.
DIP switches can be adjusted directly after the amp gain more respect and better promote greater damping horn.
Specification:
Power: 2.1 interface 8 ~ 24V DC power supply
Audio input: stereo input various versions of the Bluetooth connection using CSR8635, Bluetooth chip, Bluetooth V4.0, high software compatibility
Impedance: Output 8 Best ohms (ohm impedance 4,6,8,16 can drive speakers)
Power: Add pre-5532 output foot Output powered (25V 6-ohm, impedance output 2 50W X, 8 impedance output ohm 2X40W dual-channel)
You use extra audio you, need connect 3.5mm audio line If;
If you derectly use Bluetooth, when power and wait 3s~10s, until led blue and red light flashing alternately, then you can use your deivce to find my Bluetooth module, you will find "SANWU audio" and then connect it, can directly use it. Remember back for even.
PCB Material:
Red Color:
18.3cmX5cmX2.3cm Size: (LXWXH)
Quantity: 1 PC
Weight: 40g Net
Lighting display, and other factors may Note: cause COLOR SHADING please, comprehensive pictures and text descriptions to determine!
Package Includes
1 x Audio Receiver Amplifier Board

3.3V/5V LGT8F328P SSOP20 MiniEVB instead of Pro Mini ATMEGA328P

Note 1: The sampling rate of this logic analyzer supports up to 16-24MHz, and can sample signals up to about 3MHz (the sampling rate needs to be at least 5 times that of the original signal, and 10 times the sampling rate is generally recommended to restore the original signal better. )
Note 2: The highest sampling rate is 24MHz, but not all PCs can achieve it. After actual measurement, Linux can sample at 24MHz, and most Windows (win7/win10) can sample at 16MHz. The highest sampling rate and operating system/USB controller/USB bus Status/USB drive is related