ESP32 - Touch Sensor - LED

We are going to learn how to:

We will learn how to toggle LED each time touch sensor is touched in ESP32 - Touch Sensor Toggles LED tutorial.

Hardware Required

1×ESP-WROOM-32 Dev Module
1×Micro USB Cable
1×Touch Sensor
1×220 ohm resistor
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

  • Wiring diagram with power supply from USB cable
  • ESP32 Touch Sensor LED Wiring Diagram

    Image is developed using Fritzing. Click to enlarge image

  • Wiring diagram with power supply from 5v adapter
  • ESP32 Touch Sensor LED Wiring Diagram 5v power source

    Image is developed using Fritzing. Click to enlarge image

ESP32 Code

/* * Created by * * This example code is in the public domain * * Tutorial page: */ const int TOUCH_SENSOR_PIN = 2; // ESP32 pin connected to the OUTPUT pin of touch sensor const int LED_PIN = 3; // ESP32 pin connected to LED's pin 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 } 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

  • 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
  • Arduino IDE Upload Code
  • 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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