ch02

blink.pde

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

 */

void setup() {                 
  // initialize the digital pin as an output.
  // Pin 13 has an LED connected on most Arduino boards:
  pinMode 3 (13, OUTPUT 4);   
}

void loop() { 
  digitalWrite(13, HIGH);   // set the LED on
  delay(1000);              // wait for a second
  digitalWrite(13, LOW);  // set the LED off
  delay(1000);              // wait for a second
}