/*

  Blink

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

  Most Arduinos have an on-board LED you can control. On the Uno and

  Leonardo, it is attached to digital pin 13. If you're unsure what

  pin the on-board LED is connected to on your Arduino model, check

  the documentation at http://www.arduino.cc

  This example code is in the public domain.

  modified 8 May 2014

  by Scott Fitzgerald

 */

// the setup function runs once when you press reset or power the board

void setup() {

  // initialize digital pin 9 as an output.

  pinMode(9, OUTPUT);

}

// the loop function runs over and over again forever

void loop() {

  digitalWrite(9, HIGH);   // turn the LED on (HIGH is the voltage level)

  delay(1000);              // wait for a second

  digitalWrite(9, LOW);    // turn the LED off by making the voltage LOW

  delay(1000);              // wait for a second

}