IR Transmitter Sketch

Sketch for the IR transmitter used here

Simply paste below into the arduino sketch window.

/* This is the beam pattern for the Team Barnato timing beacon. Use at own risk and no warranties are given.
in Micro Seconds
On - 468 uS
Off - 1200 uS
On - 468 uS
Off - 1200 uS
On - 468 uS
Off - 6000 uS */

int IRledPin =  3;    // LED connected to digital pin 3
int powerLed = 13;    //Power LED is connected to pin 13

void setup()   {              
  // initialize the IR digital pin as an output:
  pinMode(IRledPin, OUTPUT);
  pinMode(powerLed, OUTPUT);
  digitalWrite(powerLed, HIGH);
  delay(2000);
  digitalWrite(powerLed, LOW);
}

void loop()                  
{
  pulseIR(468);
  delayMicroseconds(1200);
  pulseIR(468);
  delayMicroseconds(1200);
  pulseIR(468);
  delayMicroseconds(6000);
}

// This procedure sends a 38KHz pulse to the IRledPin
// for a certain # of microseconds.
void pulseIR(long microsecs) {
  // we'll count down from the number of microseconds we are told to wait

  cli();  // this turns off any background interrupts

  while (microsecs > 0) {
    // 38 kHz is about 26 microseconds - to give 50% duty cycle 13 microseconds high and 13 microseconds low
   digitalWrite(IRledPin, HIGH);  // this takes about 3 microseconds to happen
   delayMicroseconds(10);         // hang out for 10 microseconds
   digitalWrite(IRledPin, LOW);   // this also takes about 3 microseconds
   delayMicroseconds(10);         // hang out for 10 microseconds

   // so 26 microseconds altogether
   microsecs -= 26;
  }

  sei();  // this turns them back on
}