infrared.ino

void IR_send_signal(unsigned int IR_signal[]) {
  
  for(int i = 0; i < IR_SIGNAL_LENGTH; i++){
    unsigned IR_signal_bit = IR_signal[i];
    if(i % 2 == 0) IR_send_pulse(IR_signal_bit);
    else IR_send_pause(IR_signal_bit);
  }
  
}

void IR_send_pulse(unsigned int pulse_length) {
  // Send one pulse of a given length

  // Pin must be toggling between ON and OFF at 37-38kHz
  // This variable keeps track of wether the pin is ON or OFF
  int IR_on = 0;

  
  long startMicros = micros();
  while (micros() < (startMicros + pulse_length)){
    
    // toggle pin and wait 26 us to make it a pulse
    IR_on = 1 - IR_on;
    
    digitalWrite(IR_EMITTER_PIN, IR_on);

    // IR LED frequency must be around 37-38kHz
    // Approx pulse period = 26us
    // A period consists of the LED being toggled twice => 13us between toggles
    delayMicroseconds(13);
  }
  
  // turn off IR after pulse is complete
  digitalWrite(IR_EMITTER_PIN, LOW);
}

void IR_send_pause(unsigned int pause_length) {
  // A pause is just not doing anything for a given amount of time
  delayMicroseconds(pause_length);
}

// LEGACY CODE FROM HERE
//void IR_send_signal(int IR_signal[]) {
//  
//  for (int i=0; i < IR_SIGNAL_LENGTH; i++){
//    
//    int IR_signal_bit = IR_signal[i];
//
//    if (IR_signal_bit > 0) {
//      IR_send_pulse(IR_signal_bit);
//    }
//    else {
//      IR_send_pause(-IR_signal_bit);
//    }
//  }
//}


//void IR_send_pulse(int pulse_length) {
//  // Send one pulse of a given length
//  
//  int IR_on = 0;
//  long startMicros = micros();
//  while (micros() < (startMicros + pulse_length)){
//    // toggle pin and wait 26 us to make it a pulse
//    if (IR_on == 0) {
//      IR_on = 1;
//    }
//    else {
//      IR_on = 0;
//    }
//    digitalWrite(IR_LED_PIN, IR_on);
//
//    // IR LED frequency must be around 37-38kHz
//    // Approx pulse period = 26us
//    // A period consists of the LED being toggled twice => 13us between toggles
//    delayMicroseconds(13);
//  }
//  
//  // turn off IR after pulse is complete
//  digitalWrite(IR_LED_PIN, LOW);
//}
//
//void IR_send_pause(int pause_length) {
//  // A pause is just not doing anything for a given amount of time
//  delayMicroseconds(pause_length);
//}