Arduino - Button - LED

We are going to learn how to:

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

Hardware Required

1×Arduino UNO or Genuino UNO
1×USB 2.0 cable type A/B
1×Push Button
1×(Optional) Panel-mount Push Button
1×220 ohm resistor
1×Jumper Wires
1×(Optional) 9V Power Adapter for Arduino
1×(Recommended) Screw Terminal Block Shield for Arduino Uno
1×(Optional) Transparent Acrylic Enclosure For Arduino Uno

Or you can buy the following sensor kits:

1×DIYables Sensor Kit (30 sensors/displays)
1×DIYables Sensor Kit (18 sensors/displays)
Please note: These are Amazon affiliate links. If you buy the components through these links, We will get a commission at no extra cost to you. We appreciate it.

About LED and Button

If you do not know about LED and button (pinout, how it works, how to program ...), learn about them in the following tutorials:

Wiring Diagram

Arduino Button LED Wiring Diagram

This image is created using Fritzing. Click to enlarge image

Arduino 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

  • Connect Arduino to PC via USB cable
  • Open Arduino IDE, select the right board and port
  • Copy the above code and open with Arduino IDE
  • Click Upload button on Arduino IDE to upload code to Arduino
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.

The Best Arduino Starter Kit