Blink Example

This example shows the simplest thing you can do with an Arduino to see physical output: it blinks an LED.

Hardware Required

  • 1 x Arduino Board
  • 1 x LED
  • 1 x Resistor, anything between 220 ohm to 1K ohm
  • 1 x Solderless breadboard
Blink LED

Arduino Code

After you build the circuit plug your Arduino board into your computer, start the Arduino IDE, and enter the code below.

Turns on an LED on for one second, then off for one second, repeatedly.
This example code is in the public domain.
// Pin 11 has an LED connected on most Arduino boards.
// give it a name:
int led = 11;
// the setup routine runs once when you press reset:
void setup() {
// initialize the digital pin as an output.
pinMode(led, OUTPUT);
// the loop routine runs over and over again forever:
void loop() {
digitalWrite(led, HIGH); // turn the LED on (HIGH is the voltage level)
delay(1000); // wait for a second
digitalWrite(led, LOW); // turn the LED off by making the voltage LOW
delay(1000); // wait for a second


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