ESP32 - Button - LED

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

If a button is being pressed, ESP32 turns LED on
If a button is NOT being pressed, ESP32 turns LED off

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	×	USB Cable Type-C
1	×	Push Button
1	×	(Optional) Panel-mount Push Button
1	×	LED
1	×	220 ohm resistor
1	×	Breadboard
1	×	Jumper Wires
1	×	(Optional) DC Power Jack
1	×	(Recommended) ESP32 Screw Terminal Adapter

Or you can buy the following sensor kit:

DIYables Sensor Kit 30 types, 69 units

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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

This image is created using Fritzing. Click to enlarge image

If you're unfamiliar with how to supply power to the ESP32 and other components, you can find guidance in the following tutorial: How to Power ESP32.

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 18 // ESP32 pin GPIO18, which connected to button #define LED_PIN 21 // ESP32 pin GPIO21, which connected to led // variables will change: 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

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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