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Arduino - Touch Sensor - LED
We are going to learn how to:
- Turn on LED if the touch sensor is touched.
- Turn off LED if the touch sensor is NOT touched.
We will learn how to toggle LED each time touch sensor is touched in Arduino - Touch Sensor Toggles LED tutorial.
Hardware Required
Or you can buy the following sensor kit:
| 1 | × | DIYables Sensor Kit 30 types, 69 units |
Please note: These are Amazon affiliate links. If you buy the components through these links, We will get a commission at no extra cost to you. We appreciate it.
About LED and Touch Sensor
If you do not know about LED and touch sensor (pinout, how it works, how to program ...), learn about them in the following tutorials:
Wiring Diagram
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Arduino Code
/*
* Created by ArduinoGetStarted.com
*
* This example code is in the public domain
*
* Tutorial page: https://arduinogetstarted.com/tutorials/arduino-touch-sensor-led
*/
const int TOUCH_SENSOR_PIN = 2; // Arduino pin connected to the OUTPUT pin of touch sensor
const int LED_PIN = 3; // Arduino pin connected to LED's pin
void setup() {
Serial.begin(9600); // initialize serial
pinMode(TOUCH_SENSOR_PIN, INPUT); // set arduino pin to input mode
pinMode(LED_PIN, OUTPUT); // set arduino pin to output mode
}
void loop() {
int touchState = digitalRead(TOUCH_SENSOR_PIN); // read new state
if (touchState == HIGH) {
Serial.println("The sensor is being touched");;
digitalWrite(LED_PIN, HIGH); // turn on
}
else
if (touchState == LOW) {
Serial.println("The sensor is untouched");
digitalWrite(LED_PIN, LOW); // turn off
}
}
Quick Steps
- Connect Arduino to PC via USB cable
- Open Arduino IDE, select the right board and port
- Copy the above code and open with Arduino IDE
- Click Upload button on Arduino IDE to upload code to Arduino
- Touch and keep touching the touch sensor several seconds
- See the change of LED's state
Code Explanation
Read the line-by-line explanation in comment lines of source code!
Video Tutorial
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