ESP32 - Touch Sensor Toggle LED

In a previous tutorial, We have learned how to turn on the LED if the touch sensor is touched, and turn off LED if the touch sensor is released. In this tutorial, We are going to learn how to toggle LED each time touch sensor is touched.

Hardware Required

1×ESP-WROOM-32 Dev Module
1×Micro USB Cable
1×Touch Sensor
1×LED
1×220 ohm resistor
1×Breadboard
4×Jumper Wires
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About LED and Touch Sensor

If you do not have knowledge of LED and touch sensor (pinout, how they work, how to connect them to ESP32, how to program for them...), learn about them in the following tutorials:

Wiring Diagram

ESP32 Touch Sensor LED Wiring Diagram

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ESP32 Code - Touch Sensor Toggles LED

/* * Created by esp32io.com * * This example code is in the public domain * * Tutorial page: https://esp32io.com/tutorials/esp32-touch-sensor-toggle-led */ // constants won't change const int TOUCH_SENSOR_PIN = 7; // ESP32 pin connected to touch sensor's pin const int LED_PIN = 3; // ESP32 pin connected to LED's pin // variables will change: int ledState = LOW; // the current state of LED int lastTouchState; // the previous state of touch sensor int currentTouchState; // the current state of touch sensor void setup() { Serial.begin(9600); // initialize serial pinMode(TOUCH_SENSOR_PIN, INPUT); // set ESP32 pin to input mode pinMode(LED_PIN, OUTPUT); // set ESP32 pin to output mode currentTouchState = digitalRead(TOUCH_SENSOR_PIN); } void loop() { lastTouchState = currentTouchState; // save the last state currentTouchState = digitalRead(TOUCH_SENSOR_PIN); // read new state if(lastTouchState == LOW && currentTouchState == HIGH) { Serial.println("The sensor is touched"); // toggle state of LED ledState = !ledState; // control LED arccoding to the toggled state digitalWrite(LED_PIN, ledState); } }

Quick Steps

  • If this is the first time you use ESP32, see how to setup environment for ESP32 on Arduino IDE
  • Connect the ESP32 board to your PC via a micro USB cable
  • Open Arduino IDE, select the right ESP32 board and COM port
  • Copy the above code and paste it to Arduino IDE
  • Click Upload button on Arduino IDE to compile and upload code to ESP32 board
  • Keep touching the touch sensor several seconds and then release it.
  • See the change of LED's state

Code Explanation

Read the line-by-line explanation in comment lines of code!

In the code, ledState = !ledState is equivalent to the following code:

if(ledState == LOW) ledState = HIGH; else ledState = LOW;

Video Tutorial

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