Introduction: Clone a Remote With Arduino

About: My name is Randy and I am a Community Manager in these here parts. In a previous life I had founded and run the Instructables Design Studio (RIP) @ Autodesk's Pier 9 Technology Center. I'm also the author of t…

I recently needed to use the Arduino to control a stereo system, so rather than hack open the remote and wire into it, I decided to simply clone the signal. This was incredibly easy to do. Basically, I read the signal from the remote with a 38khz receiver, and then played it back with an IR LED.

To start, I went to the IR Sensor Tutorial on and loaded the following script onto my Arduino:
/* Raw IR decoder sketch!
 This sketch/program uses the Arduno and a PNA4602 to 
 decode IR received. This can be used to make a IR receiver
 (by looking for a particular code)
 or transmitter (by pulsing an IR LED at ~38KHz for the
 durations detected 
 Code is public domain, check out and
 for more tutorials! 
// We need to use the 'raw' pin reading methods
// because timing is very important here and the digitalRead()
// procedure is slower!
//uint8_t IRpin = 2;
// Digital pin #2 is the same as Pin D2 see
// for the 'raw' pin mapping
#define IRpin_PIN      PIND
#define IRpin          2
// the maximum pulse we'll listen for - 65 milliseconds is a long time
#define MAXPULSE 65000
// what our timing resolution should be, larger is better
// as its more 'precise' - but too large and you wont get
// accurate timing
#define RESOLUTION 20 
// we will store up to 100 pulse pairs (this is -a lot-)
uint16_t pulses[100][2];  // pair is high and low pulse 
uint8_t currentpulse = 0; // index for pulses we're storing
void setup(void) {
  Serial.println("Ready to decode IR!");
void loop(void) {
  uint16_t highpulse, lowpulse;  // temporary storage timing
  highpulse = lowpulse = 0; // start out with no pulse length
//  while (digitalRead(IRpin)) { // this is too slow!
    while (IRpin_PIN & _BV(IRpin)) {
     // pin is still HIGH
     // count off another few microseconds
     // If the pulse is too long, we 'timed out' - either nothing
     // was received or the code is finished, so print what
     // we've grabbed so far, and then reset
     if ((highpulse >= MAXPULSE) && (currentpulse != 0)) {
  // we didn't time out so lets stash the reading
  pulses[currentpulse][0] = highpulse;
  // same as above
  while (! (IRpin_PIN & _BV(IRpin))) {
     // pin is still LOW
     if ((lowpulse >= MAXPULSE)  && (currentpulse != 0)) {
  pulses[currentpulse][1] = lowpulse;
  // we read one high-low pulse successfully, continue!
void printpulses(void) {
  Serial.println("\n\r\n\rReceived: \n\rOFF \tON");
  for (uint8_t i = 0; i < currentpulse; i++) {
    Serial.print(pulses[i][0] * RESOLUTION, DEC);
    Serial.print(" usec, ");
    Serial.print(pulses[i][1] * RESOLUTION, DEC);
    Serial.println(" usec");
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