Published March 6, 2023

Toggle LED with Touch Sensor

How to use Touch Sensor with Arduino

BeginnerFull instructions provided261

Things used in this project

Hardware components

Arduino UNO

DFRobot Gravity: Digital Capacitive Touch Sensor For Arduino

Jumper wires (generic)

LED (generic)

Software apps and online services

Arduino IDE

Story

What is Touch Sensor?

A touch sensor is an electronic device that can detect physical touch or pressure. It can be used to trigger actions or events in a wide range of electronic devices, including smartphones, tablets, and industrial control systems.

There are different types of touch sensors, including resistive, capacitive, and surface acoustic wave (SAW) touch sensors. Resistive touch sensors use two thin layers of conductive material separated by a small gap. When you touch the sensor, the two layers come into contact, creating a change in electrical resistance that can be detected by the device.

Capacitive touch sensors use the human body's capacitance to detect touch. When you touch the sensor, it creates a change in the capacitance, which is detected by the device.

SAW touch sensors use ultrasonic waves that are sent across the surface of the screen. When you touch the screen, the waves are disrupted, creating a change in the signal that can be detected by the device.

Touch sensors are commonly used in devices such as smartphones, tablets, and laptops to allow users to interact with the device through touch gestures. They are also used in industrial control systems to provide operators with a tactile interface for controlling machinery and equipment.

You can use the TTP223 touch sensor module with an Arduino board to detect touch events and trigger actions in your Arduino project.

Full Video Tutorial

Code

Toggle LED with TTP223 Capacitive Touch Sensor project

const int SENSOR_PIN = 2; // the Arduino's input pin that connects to the sensor's SIGNAL pin 

// Variables will change:
int lastState = LOW;      // the previous state from the input pin
int currentState;         // the current reading from the input pin
int ledState = LOW;             // the current LED state

void setup() {
  pinMode(SENSOR_PIN, INPUT); // initialize the Arduino's pin as aninput
 
  pinMode(LED_BUILTIN, OUTPUT);  // initialize digital pin LED_BUILTIN as an output.
}

void loop() {
  // read the state of the the input pin:
  currentState = digitalRead(SENSOR_PIN);

  if(lastState == LOW && currentState == HIGH){
    // toggle LED state
    if(ledState == LOW)
      ledState = HIGH;
    else if(ledState == HIGH)
      ledState = LOW;

    // control LED
    digitalWrite(LED_BUILTIN, ledState);
  }

  // save the the last state
  lastState = currentState;
}

Credits

ENERGEN

17 projects • 9 followers

Youtube creator

Toggle LED with Touch Sensor

Things used in this project

Hardware components

Software apps and online services

Story

Schematics

Touch sensor with Arduino

Code

Toggle LED with TTP223 Capacitive Touch Sensor project

Credits

ENERGEN

Comments

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Toggle LED with Touch Sensor

Toggle LED with Touch Sensor

Things used in this project

Hardware components

Software apps and online services

Story

Schematics

Touch sensor with Arduino

Code

Toggle LED with TTP223 Capacitive Touch Sensor project

Credits

ENERGEN

Comments

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