008: Flash Sketch

This is based on the Blink sketch, with the timing changed. The Flash duration is very low (10ms) but visible:

/*
  Flash

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

  The circuit:
* LED connected from digital pin 13 to ground.

* Note: On most Arduino boards, there is already an LED on the board
connected to pin 13, so you don't need any extra components for this example.


  Created 5 March 2010
  By Mike Goodwin

*/

int ledPin = 13; // LED connected to digital pin 13

// The setup() method runs once, when the sketch starts

void setup(
{
  // initialize the digital pin as an output:
  pinMode(ledPin, OUTPUT);
}

// the loop() method runs over and over again,
// as long as the Arduino has power

void loop()
{
  digitalWrite(ledPin, HIGH); // set the LED on
  delay(10); // wait for a centisecond
  digitalWrite(ledPin, LOW); // set the LED off
  delay(1000); // wait for a second
}