Description

This is the standard Blink.cpp example from the Arduino software. It uses information about specific pins and chips used in the Arduino to define a number of constants that are required for any blink program. In particular it uses a GPIO pin #13 as the LED target, because all Arduinos have an LED attached to that GPIO. It uses library specific code for doing a delay so that the LED will blink in a human visible way.

The Source Code

/*
  Blink
  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
}

License

This work is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License. You are free to play around with it and modify it but you are not licensed to use it for commercial purposes. Click the link above for more details on your rights under this license.