▷ Turn On/Off LED with Button - Arduino

In this post, I will show you how to turn a LED on and off with a button using Arduino. I will guide you step by step so you can understand the basic concepts of electronics and programming in a simple way.

Materials:

Connection diagram.

Explained code:

/* 

* Code written by: Esteban Carrillo for EDEPTEC.
* Website: https://www.edeptec.com
* Facebook: @edeptec
* Youtube: https://youtube.com/c/EDEPTEC

*/

#define led 13 // led on pin 13
#define button 2 // button on pin 2

bool ledState = 0; // Variable to control the state of the led
bool previousState = 0; // Variable to control the previous state of the button

void setup()
{
  pinMode(led, OUTPUT); // led as output
  pinMode(button, INPUT);// button as input
  digitalWrite(led, 0); // led off by default
}

void loop()
{
  bool buttonState = digitalRead(button); // Logical state of the button
  if (buttonState != previousState) { // Debounce implementation
    if (buttonState == HIGH) ledState = !ledState; // When the button is pressed, change the value of the ledState variable
  }

  delay(10); // 10ms pause

 previousState = buttonState; // Debounce implementation
  
  digitalWrite(led, ledState); // The led is turned on or off depending on the value of the variable ledState
}