Simple Beep Function

// Hook up a buzzer and use it to indicate when your robot is backing up
// source: http://forum.arduino.cc/index.php?topic=3757.0

#define BZZR 4   //digital pin to hook buzzer's red wire to

void setup() {
  pinMode(BZZR, OUTPUT); //set the buzzer as output
}

void loop() {

  beep();

}

void beep(){
  for (int i=0; i<500; i++) {  // generate a 1KHz tone for 1/2 second
    digitalWrite(BZZR, HIGH);
    delayMicroseconds(500);
    digitalWrite(BZZR, LOW);
    delayMicroseconds(500);
   }
   delay(500);
}