/* 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 www.ladyada.net and adafruit.com

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

// http://arduino.cc/en/Hacking/PinMapping168 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.begin(9600);

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 & (1 << IRpin)) {

// pin is still HIGH

// count off another few microseconds

highpulse++;

delayMicroseconds(RESOLUTION);

// 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)) {

printpulses();

currentpulse=0;

return;

}

}

// 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

lowpulse++;

delayMicroseconds(RESOLUTION);

if ((lowpulse >= MAXPULSE) && (currentpulse != 0)) {

printpulses();

currentpulse=0;

return;

}

}

pulses[currentpulse][1] = lowpulse;

// we read one high-low pulse successfully, continue!

currentpulse++;

}

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");

}

// print it in a 'array' format

Serial.println("int IRsignal[] = {");

Serial.println("// ON, OFF (in 10's of microseconds)");

for (uint8_t i = 0; i < currentpulse-1; i++) {

Serial.print("\t"); // tab

Serial.print(pulses[i][1] * RESOLUTION / 10, DEC);

Serial.print(", ");

Serial.print(pulses[i+1][0] * RESOLUTION / 10, DEC);

Serial.println(",");

}

Serial.print("\t"); // tab

Serial.print(pulses[currentpulse-1][1] * RESOLUTION / 10, DEC);

Serial.print(", 0};");

}