infrared LED doesn't seem to light up

jochenv · March 26, 2015, 4:55pm

hallo,
i´m trying to control an air-conditioning system from daikin using a meg2560. i managed to read the IR code, now i´m trying to send it using the attached sketch. it seems to run fine, i get the test-text on the serial but the led itself doesn´t light up. it is connected via a resistor between ground an pin D3. after testing with my mobile i replaced the IR with a regular LED but that also stays dark so i suspect i´m having a problem in the sketch itself.
thank you very much for any useful comment:-)
jochen

int IR_led  = 3;


void setup()
{
  pinMode(IR_led, OUTPUT);
  Serial.begin(9600);

}
void pulseIR (long microsecs)
{
}
void loop()
{
  Serial.println("loop");



  //Daikin ON
  Serial.println("ON");

  pulseIR(460);
  delayMicroseconds(1220);
  pulseIR(460);
  delayMicroseconds(400);
  pulseIR(440);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(1240);
  pulseIR(440);
  delayMicroseconds(400);
  pulseIR(440);
  delayMicroseconds(400);
  pulseIR(440);
  delayMicroseconds(400);
  pulseIR(440);
  delayMicroseconds(400);
  pulseIR(440);
  delayMicroseconds(1240);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(1220);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(1240);
  pulseIR(440);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(400);
  pulseIR(440);
  delayMicroseconds(1240);
  pulseIR(460);
  delayMicroseconds(1220);
  pulseIR(460);
  delayMicroseconds(1240);
  pulseIR(440);
  delayMicroseconds(400);
  pulseIR(440);
  delayMicroseconds(400);
  pulseIR(440);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(400);
  pulseIR(440);
  delayMicroseconds(400);
  pulseIR(440);
  delayMicroseconds(400);
  pulseIR(440);
  delayMicroseconds(400);
  pulseIR(440);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(400);
  pulseIR(440);
  delayMicroseconds(1240);
  pulseIR(440);
  delayMicroseconds(1240);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(1220);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(1240);
  pulseIR(440);
  delayMicroseconds(400);
  pulseIR(440);
  delayMicroseconds(400);
  pulseIR(460);
  delayMicroseconds(1220);
  pulseIR(460);
  delayMicroseconds(1220);
  pulseIR(460);



  delay (1000);



  //Daikin OFF
  Serial.println("OFF");

  pulseIR(460);
  delayMicroseconds(1240);
  pulseIR(440);
  delayMicroseconds(400);
  pulseIR(440);
  delayMicroseconds(1240);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(440);
  delayMicroseconds(400);
  pulseIR(440);
  delayMicroseconds(400);
  pulseIR(440);
  delayMicroseconds(400);
  pulseIR(440);
  delayMicroseconds(400);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(1220);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(1220);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(1240);
  pulseIR(440);
  delayMicroseconds(400);
  pulseIR(440);
  delayMicroseconds(1240);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(1220);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(1220);
  pulseIR(460);
  delayMicroseconds(1240);
  pulseIR(440);
  delayMicroseconds(1240);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(1220);
  pulseIR(460);
  delayMicroseconds(1240);
  pulseIR(440);
  delayMicroseconds(400);
  pulseIR(440);
  delayMicroseconds(400);
  pulseIR(440);
  delayMicroseconds(400);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(440);
  delayMicroseconds(400);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(440);
  delayMicroseconds(400);
  pulseIR(440);
  delayMicroseconds(400);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(460);
  delayMicroseconds(380);
  pulseIR(440);
  delayMicroseconds(400);
  pulseIR(440);


}

system · March 26, 2015, 5:34pm

You don't appear to ever write to the pin the LED is connected to.

Also, before you wear-out your keyboard, please find out about arrays and loops.

JimboZA · March 26, 2015, 5:38pm

The function pulseIR() is empty... so although you're calling it, it does nothing.

void pulseIR (long microsecs)
{
}

Have a look at this example at adafruit. About half-way down, you'll see code inside that function that creates a 38kHz carrier. If yours isn't 38kHz (some aren't), then you just adjust the delayMicroseconds() for the high ands lows.

MarkT · March 26, 2015, 5:39pm

Perhaps this:

void pulseIR (long microsecs)
{
}

should be a bit more like:

void pulseIR (long microsecs)
{
  digitalWrite (IR_led, HIGH) ;
  delayMicroseconds (microsecs) ;
  digitalWrite (IR_led, LOW) ;
}

jochenv · March 26, 2015, 9:52pm

Thanks very much all of you for your comments. Seems I have a lot to learn:-)

jochenv · March 26, 2015, 9:54pm

Although, until now, I thought the PulsIR function was talking to the LED. As I said, a lot to learn...

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infrared LED doesn't seem to light up

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