Arduino - Button With LED




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Turns ON and OFF a light LED, when pressing a pushbutton.

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Step 1: Hardware Required

  • Arduino Uno
  • LED
  • Button
  • 220 and 10k ohm resistors
  • Wires
  • Breadboard

Step 2: LED Connections

  1. LED attach to board
  2. Resistor (220 ohm) connect to LED's long leg (+)
  3. The wire connect to resistor empty leg
  4. After that, same wire connect to digital pin from resistor
  5. The wire connect to LED's short leg (-), after that same wire connect to ground

Step 3: Pushbutton Connections

  • The button attach to board
  • 10k resistor connect to button leg
  • The wire connect to resistor empty leg, after that same wire connect to ground
  • The wire connect to button's other leg, after that same wire connect to +5V
  • The yellow wire connect to button's top leg, after that connect to digital pin

Step 4: Code

const int ledPin = 2;

const int buttonPin = 4;

int buttonState = 0;

void setup() {


pinMode(ledPin, OUTPUT);

pinMode(buttonPin, INPUT);


void loop() {

buttonState = digitalRead(buttonPin);

if (buttonState == HIGH) {

digitalWrite(ledPin, HIGH);

Serial.println("LED ON +++++++");

else {

digitalWrite(ledPin, LOW);

Serial.println("LED OFF -------");



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    7 Discussions


    1 year ago

    seems like straight up plagiarism, taken straight from the arduino webpage. shameful


    1 year ago

    Hello friend,

    I need to make a project but my zero knowledge in programming does not allow me to build it. For someone with knowledge and experience may be a project for children :).

    I am wondering if you can help me on that.. please!

    Micky Flanagan

    2 years ago

    Maybe it's not yours or something but the arduino uno on the first page looks like a knockoff.

    2 replies

    1 year ago

    i dont know what i did wrong and it didnt work