Arduino and touch button

Arduino and the touch button

A short guide showing how to connect Arduino and the touch button.

The following elements are used in the example:

Connecting the module with Arduino:

In order to operate the module with Arduino, you have to connect the system as follows:

Module Pin Arduino
GND GND
OUT 2
VCC 5 V

The diagram of the module connection with Arduino Uno.

Program for Arduino

The output output generates a high state by default. When a touch is detected, it is set to a low state. The following code is used in the example:

  1. int sensor = 2; //pin 2 connected to a sensor signal
  2.  
  3. void setup() {
  4.   Serial.begin(9600); //initialisation of a serial monitor
  5.   pinMode(sensor, INPUT); // setting the Arduino pin as input
  6.   pinMode(13, OUTPUT); //pin 13 as output
  7.  
  8.   Serial.println("---- TEST TESTING THE REFERENCE BUTTON ----");
  9. }
  10.  
  11. void loop() {
  12.   int war = digitalRead (sensor); //reading the value from the sensor
  13.   if (war === LOW) // displaying information on a serial monitor
  14.   { // low state means touch detection, high state means no touch detection
  15.     Serial.println(" Touch Detected");          
  16.     digitalWrite(13, HIGH); // additionally, if touch is detected, the LED under pin 13 lights up
  17.   }
  18.   else
  19.   { Serial.println("Free");
  20.     digitalWrite(13, LOW);
  21.   }
  22.   delay(200); // delay between readings
  23. }

The program displays messages on a serial monitor. Additionally, when a touch is detected, the LED in the module and the one in Arduino from pin 13 will light up. The effects of the program can be observed on the screen below:

Serial screenshot of the serial monitor.

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