ESP32 - Button - LED

This tutorial instructs you how to use ESP32 to control LED based on the pressing state of button. In detail:

We also have another tutorial: ESP32 - Button Toggles LED, which toggle LED state between ON and OFF when the button is pressed.

Hardware Used In This Tutorial

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

We have specific tutorials about LED and button. Each tutorial contains detailed information and step-by-step instructions about hardware pinout, working principle, wiring connection to ESP32, ESP32 code... Learn more about them at the following links:

Wiring Diagram between ESP32, LED and Button

wiring diagram between esp32 button led

This image is created using Fritzing. Click to enlarge image

ESP32 Code

/* * This ESP32 code is created by esp32io.com * * This ESP32 code is released in the public domain * * For more detail (instruction and wiring diagram), visit https://esp32io.com/tutorials/esp32-button-led */ #define BUTTON_PIN 16 // ESP32 pin GIOP16, which connected to button #define LED_PIN 18 // ESP32 pin GIOP18, which connected to led // The below are variables, which can be changed int button_state = 0; // variable for reading the button status void setup() { // initialize the LED pin as an output: pinMode(LED_PIN, OUTPUT); // initialize the button pin as an pull-up input: // the pull-up input pin will be HIGH when the button is open and LOW when the button is pressed. pinMode(BUTTON_PIN, INPUT_PULLUP); } void loop() { // read the state of the button value: button_state = digitalRead(BUTTON_PIN); // control LED according to the state of button if (button_state == LOW) // if button is pressed digitalWrite(LED_PIN, HIGH); // turn on LED else // otherwise, button is not pressing digitalWrite(LED_PIN, LOW); // turn off LED }

Quick Instructions

  • If this is the first time you use ESP32, see how to setup environment for ESP32 on Arduino IDE.
  • Do the wiring as above image.
  • Connect the ESP32 board to your PC via a micro USB cable
  • Open Arduino IDE on your PC.
  • Select the right ESP32 board (e.g. ESP32 Dev Module) and COM port.
  • Copy the above code and paste it to Arduino IDE.
  • Compile and upload code to ESP32 board by clicking Upload button on Arduino IDE
  • Arduino IDE Upload Code
  • Press and keep pressing the button several seconds
  • See the change on LED's state

Line-by-line Code Explanation

The above ESP32 code contains line-by-line explanation. Please read the comments in the code!

Video Tutorial

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