Capacitive touch sensor interfacing with PIC Microcontroller and Mikro C

In this tutorial we will learn how to interface capacitive touch sensor with microcontroller. Here I am use PIC16F877A microcontroller and LM16x2 Lcd display. The Lcd display show the status of LED.
You can watch the video or read the written tutorial below.

Picture of Capacitive Touch Sensor.

Pin Configuration

VCC : Positive Supply (2V to 5.5V)
I/O
GND : Ground supply

Capavitive Touch Sensor is a input device. It is use for switch as like push button. Capacitive touch sensor is relies on figer pressure for interaction. When a figure touch on sensor surface then the senor output is active high. While the finger relies on touch surface the output is active low.

Circuit schematic:

Here is am use latch technique for LED switching.

Latch circuits output has tow stable state

High state
Low state

While output High state then the Led is ON and Low state Led is OFF.

Mikro C Code for this projects:

	// Lcd module connections
	sbit LCD_RS at RB0_bit;
	sbit LCD_EN at RB1_bit;
	sbit LCD_D4 at RB2_bit;
	sbit LCD_D5 at RB3_bit;
	sbit LCD_D6 at RB4_bit;
	sbit LCD_D7 at RB5_bit;

	sbit LCD_RS_Direction at TRISB0_bit;
	sbit LCD_EN_Direction at TRISB1_bit;
	sbit LCD_D4_Direction at TRISB2_bit;
	sbit LCD_D5_Direction at TRISB3_bit;
	sbit LCD_D6_Direction at TRISB4_bit;
	sbit LCD_D7_Direction at TRISB5_bit;
	// End lcd module connnections
	# define SW PORTD.RD7 // switch is connect to RD7
	int i = 0;
	void main() {
	TRISC = 0X00; // PORTC in output
	TRISD = 0X80; // RD7 is input
	PORTC = 0X00; // clear PORTC
	PORTD = 0X00; // Clear PORTD
	Lcd_Init(); // Initialize Lcd module
	Lcd_Cmd(_LCD_CURSOR_OFF); // Lcd cursor off
	Lcd_Cmd(_LCD_CLEAR); // Led clear
	Lcd_Out(1,3,"DEVELOPED BY"); // Lcd show "DEVELOPED BY"
	Lcd_Out(2,1,"MINA TECHNOLOGY"); // Lcd show "MINA TECHNOLOGY"
	delay_ms(2000); // 2s delay
	Lcd_Cmd(_LCD_CLEAR); // Lcd clear
	Lcd_Out(1,2,"TOUCH SENSOR"); // Lcd show "LATCH"
	Lcd_Out(2,1,"LED:"); // Lcd show "LED:"

	while(1){ // Endless loop
	if(SW==1){
	while(SW==1); // wait for SW release
	i++; // Increase value
	}

	PORTC = i;
	if(i==2)i=0;
	if(i==0){
	Lcd_Out(2,5,"OFF");
	}
	else{
	Lcd_Out(2,5,"ON ");
	}
	}

	}