ESP32 - Button - LED

We are going to learn how to:

We will learn how to toggle LED each time button is pressed in ESP32 - Button Toggles LED tutorial.

Hardware Required

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

If you do not have knowledge of LED and button (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 Button LED Wiring Diagram

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ESP32 Code

/* * Created by * * This example code is in the public domain * * Tutorial page: */ // constants won't change. They're used here to set pin numbers: const int BUTTON_PIN = 7; // the number of the pushbutton pin const int LED_PIN = 3; // the number of the LED pin // variables will change: int buttonState = 0; // variable for reading the pushbutton status void setup() { // initialize the LED pin as an output: pinMode(LED_PIN, OUTPUT); // initialize the pushbutton pin as an pull-up input: // the pull-up input pin will be HIGH when the switch is open and LOW when the switch is closed. pinMode(BUTTON_PIN, INPUT_PULLUP); } void loop() { // read the state of the pushbutton value: buttonState = digitalRead(BUTTON_PIN); // control LED according to the state of button if(buttonState == LOW) // If button is pressing digitalWrite(LED_PIN, HIGH); // turn on LED else // otherwise, button is not pressing digitalWrite(LED_PIN, LOW); // turn off LED }

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
  • Press and keep pressing the button 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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Button and LED on Commercial Products

Most electronic products have a reset button. Additionally, the button also keeps other functionalities in many products.


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