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Blinking LED example

by iainhendry71

This is the basic example that comes as one of the examples when you download the arduino software, I use this to give the board a quick test.

In the picture below you can see this running on an Arduino MEGA 2560 clone board, the LED has the letter L beside it.

arduino mega 2560

arduino mega 2560

Here is the code that comes with the example

Turns on an LED on for one second, then off for one second, repeatedly.

This example code is in the public domain.

// Pin 13 has an LED connected on most Arduino boards.
// give it a name:
int led = 13;

// 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


Now compile and upload the example and the LED on the board will blink on for one second and then off for a second

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