Capacitive inching touch switch module control (stm32f103c8t6)

This experiment is controlled by capacitive touch module led The light goes on and off , And print relevant information in the serial port debugging assistant .

One 、 summary

1. brief introduction

This module is based on touch detection IC(TTP223B) Capacitive inching touch switch module . Normally , Module output low level , The mode is low power consumption mode ; When touching the corresponding position with your finger , The module outputs a high level , Switch mode to fast mode ; When continuous 12 Seconds without touch , The mode is switched to low power consumption mode . Modules can be mounted on non-metallic materials such as plastic 、 The surface of the glass , In addition, put a thin piece of paper （ Nonmetal ） Cover the module surface , As long as the position of the touch is correct , Can be made to hide in the wall 、 Buttons on the desktop, etc .

2. Product features

1. Inching type ： The initial state is low , Touch high , Low level without touch （ Similar to the touch button function ）
2. low power consumption
3. The power supply can be 2-2.5V
4. Both front and back sides can be used as touch surfaces , It can replace the traditional touch button
5. Control interface ： common 3 One pin （GND、VCC、SIG）,GND For the land ,VCC Provide power supply ,SIG Output pin for data signal
6. Power indicator ： green LED, It lights up when the power is on correctly ;
7. Touch area ： Icon internal area similar to indication , Touch with your finger to trigger

Two 、 Experimental materials

1. Minimum system STM32F10SC8T6
2. Capacitive inching touch switch module
3. There are several DuPont lines

3、 ... and 、 Hardware connection

Module pin	GPIO
VCC	VCC
GND	GND
SIG	PA1

notes ：1： touch

Four 、 Program code

1. initialization

void Switch_Touch_Pin_Init(void)
{
    
	GPIO_InitTypeDef GPIO_InitStruct;
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);
	
	GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN_FLOATING;
	GPIO_InitStruct.GPIO_Pin = GPIO_Pin_1;
	GPIO_Init(GPIOA,&GPIO_InitStruct);
}

2. State read

//1： touch 
int Switch_Touch_Value(void)
{
    
	return GPIO_ReadInputDataBit(GPIOA,GPIO_Pin_1);
}

3. The main function

int main(void)
{
    
	int flag = 0;
	Switch_Touch_Pin_Init();
	Usart1_Pin_Init(115200);
	Sys_Delay_Init();
	Led_Init();
	printf(" Successful initialization \r\n");
	
	while(1)
	{
    
		if(Switch_Touch_Value())
		{
    
			LED_TRUN;// The light status is reversed 
			flag++;
			while(Switch_Touch_Value());// Waiting for release  
			if(flag == 1)
			{
    
				printf(" open led The lamp \r\n");
			}
			if(flag == 2)
			{
    
				flag = 0;
				printf(" close led The lamp \r\n");
			}
		}
	}
}

5、 ... and 、 Experimental results

Complete procedures and relevant data ：
link ：https://pan.baidu.com/s/15vrdCwts_bA5bA6gL-hKnQ
Extraction code ：pib9

If there is any mistake, please point out , thank you ！