Using touch sensor with Arduino

  • avatar
  • 821 Views
  • 4 mins read

Touch sensor (also known as touch button) is widely used to control devices. It detects touch, force or pressure on its surface changing the logic state of the circuit. Actually, it works in very similar way as to buttons. Checkout the wiring and Arduino code implementation to track the current state and the state changes.

Components

arduino-nano

1x Arduino Nano (or another Arduino module)

Buy now

mini-breadboard

1x Mini-breadboard

Buy now

touch-sensor

1x Touch sensor

Buy now

dupont

Dupont wires

Buy now

Wiring schema

This example demonstrates the use of a touch sensor with Arduino Nano. By default, the signal value is LOW and it switches to HIGH when the touch sensor is pressed.

arduino touch sensor

Note: the button pin can be connected to Arduino Nano D4 or any other digital input pin.

Arduino code

We've defined a struct (called touch) to represent the current state of the touch sensor and the state in the previous loop iteration. The serial monitor will output a message when the sensor changes the state, i.e., is pressed, in real time.

#define BUTTON_PIN 4

struct touch {
byte wasPressed = LOW;
byte isPressed = LOW;
};

touch touch;

void setup()
{
pinMode(BUTTON_PIN, INPUT_PULLUP);

Serial.begin(115200);
}

void loop()
{
touch.isPressed = isTouchPressed(BUTTON_PIN);

if (touch.wasPressed != touch.isPressed) {
Serial.println("Touch pressed");
}

touch.wasPressed = touch.isPressed;
}

bool isTouchPressed(int pin)
{
return digitalRead(pin) == HIGH;
}

Note: any other digital PIN may be used.

Credits

Official GitHub: https://github.com/hibit-dev/touch

 Join Our Monthly Newsletter

Get the latest news and popular articles to your inbox every month

We never send SPAM nor unsolicited emails

0 Comments

Leave a Reply

Your email address will not be published.

Replying to the message: View original

Hey visitor! Unlock access to featured articles, remove ads and much more - it's free.