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Combining code from both the IR decoding and creating a virtual USB keyboard learning sections provides the core pieces of code to create the Pro Trinket Dup Pop IR to USB reciever.   A final listing of code using these core pieces is shown below.  

The trick in making sure the functionality of the IR decoding and the USB keyboard worked together was to make sure the necessary polling associated with the USB keyboard was located within the proper IR scanning loop.  
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/* Pro Trinket Duo Pop Receiver IR decoder sketch!
 
 This sketch/program uses the Arduino and a Duo Pop Receiver IR board to 
 decode IR received data from 4 of the Poppers and translate the received data
 into keystrokes. 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.  This sketch leveraged tutorials from www.ladyada.net and adafruit.com.
 
 Created by: www.itaparcade.com
 Twitter: @iTapArcade
 e-mail: [email protected]
 Date created: 9/20/2014
 Date updated: 9/20/2014
 
 For preassembled Duo Pop kit information, contact us at [email protected]
 
 */
//#include <SendOnlySoftwareSerial.h>
#include "UsbKeyboard.h"

// 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      PINC
#define IRpin          PINC5  // Connect to A5 on Pro Trinket

#define ledPin         13 

// the maximum pulse we'll listen for - 1 milliseconds based on Duo Pop pulses

#define MAXPULSE 1000

// 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 

#define FUZZINESS 45

// 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

// Red Code

int DUOPOPsignalRed[] = { // ON, OFF (in 10's of microseconds) 
140, 50, 
100, 50, 
100, 100, 
50, 50, 
100, 50, 
100, 50, 
100, 100,  
50, 50,  
100, 50,  
100};

int DUOPOPsignalBlue[] = { // ON, OFF (in 10's of microseconds) 
140, 50, 
100, 50, 
100, 50, 
100, 100, 
50, 50, 
100, 50, 
100, 50,  
100, 100,  
50, 50,  
100};


int DUOPOPsignalYellow[] = { // ON, OFF (in 10's of microseconds) 
140, 
100, 50, 
50, 100, 
100, 50, 
50, 100, 
100, 50, 
50, 100, 
100, 50, 
50, 100, 
50, 100};

int DUOPOPsignalGreen[] = { // ON, OFF (in 10's of microseconds) 
140, 
50, 100, 
100, 50, 
50, 100,
100, 50, 
50, 100, 
100, 50, 
50, 100, 
100, 50, 
50, 100};

//SendOnlySoftwareSerial Serial(0);

void setup(void) {
    // initialize the LED pin as an output.
 // Serial.begin(9600);
 // Serial.println("Ready to decode IR!");  
  pinMode(ledPin, OUTPUT);
  digitalWrite(ledPin, LOW);
  pinMode(IRpin, INPUT); 
//  pinMode(Pwrpin, OUTPUT);
//  digitalWrite (Pwrpin, HIGH);
 // Serial.begin(9600);
 // Serial.println("Ready to decode IR!");

 
   // Disable timer0 since it can mess with the USB timing. Note that
  // this means some functions such as delay() will no longer work.
  TIMSK0&=!(1<<TOIE0);

  // Clear interrupts while performing time-critical operations
  cli();

  // Force re-enumeration so the host will detect us
  usbDeviceDisconnect();
  delayMs(250);
  usbDeviceConnect();

  // Set interrupts again
  sei();
}

// What percent we will allow in variation to match the same code \\ #define FUZZINESS 20
 
void loop(void) {
   
  int numberpulses;
    
  numberpulses = listenForIR();
 
//  Serial.print("Heard ");
//  Serial.print(numberpulses);
//  Serial.println("-pulse long IR signal");
  if (numberpulses == 10)
  {  
   // Serial.println("Received IR!"); 
   // digitalWrite(LED, HIGH);
   //   delay(50);
    //  digitalWrite(LED, LOW);
  if (IRcompare(numberpulses, DUOPOPsignalRed)) {
  //  Serial.println("RED Buzzed In");
 // UsbKeyboard.sendKeyStroke(KEY_A);
//    digitalWrite(ledPin, LOW); // Toggle status LED
  //  delayMs(500);
    UsbKeyboard.sendKeyStroke(KEY_1);
    digitalWrite(ledPin, HIGH); // Toggle status LED
    delayMs(500);
  }
  if (IRcompare(numberpulses, DUOPOPsignalBlue)) {
   // Serial.println("BLUE Buzzed In");

  UsbKeyboard.sendKeyStroke(KEY_3);
     digitalWrite(ledPin, HIGH); // Toggle status LED
    delayMs(500);
  }
    if (IRcompare(numberpulses, DUOPOPsignalYellow)) {
   // Serial.println("Yellow Buzzed In");
     UsbKeyboard.sendKeyStroke(KEY_2);
     digitalWrite(ledPin, HIGH); // Toggle status LED
    delayMs(500);

  }
   if (IRcompare(numberpulses, DUOPOPsignalGreen)) {
   // Serial.println("Green Buzzed In");
     UsbKeyboard.sendKeyStroke(KEY_4);
     digitalWrite(ledPin, HIGH); // Toggle status LED
    delayMs(500);

  }
  }
  // Show Trigger Status via LED
digitalWrite(ledPin, LOW); 
 
}

int listenForIR(void) {
  currentpulse = 0;
 
  while (1) {
  
    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)) {
     while (IRpin_PIN & _BV(IRpin)) {
       
       // Need to poll USB periodically while waiting for popper responses
       UsbKeyboard.update();
       
       // 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)) || (currentpulse == 10)) {
         return currentpulse;
       }
    }
    // 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)) || (currentpulse == 10)) {
         return currentpulse;
       }
    }
    pulses[currentpulse][1] = lowpulse;
 
    // we read one high-low pulse successfully, continue!
    currentpulse++;
  }
}


boolean IRcompare(int numpulses, int Signal[]) {
 
  for (int i=0; i< numpulses-1; i++) {
    int oncode = pulses[i][1] * RESOLUTION / 10;
    int offcode = pulses[i+1][0] * RESOLUTION / 10;
 
    
 //   Serial.print(oncode); // the ON signal we heard
 //   Serial.print(" - ");
 //   Serial.print(Signal[i*2 + 0]); // the ON signal we want 
    
 
    // check to make sure the error is less than FUZZINESS percent
    if ( abs(oncode - Signal[i*2 + 0]) <= (Signal[i*2 + 0] * FUZZINESS / 100)) {
  //    Serial.print(" (ok)");
    
      
    } else {
  //    Serial.print(" (x)");
      // we didn't match perfectly, return a false match
      return false;
    }
 
    
 //   Serial.print("  \t"); // tab
 //   Serial.print(offcode); // the OFF signal we heard
 //   Serial.print(" - ");
 //   Serial.print(Signal[i*2 + 1]); // the OFF signal we want 
    
 
    if ( abs(offcode - Signal[i*2 + 1]) <= (Signal[i*2 + 1] * FUZZINESS / 100)) {
  //    Serial.print(" (ok)");
    } else {
  //    Serial.print(" (x)");
      // we didn't match perfectly, return a false match
      return false;
    }
 
   // Serial.println();
  }
  // Everything matched!
  return true;
}

/**
 * Define our own delay function so that we don't have to rely on
 * operation of timer0, the interrupt used by the internal delay()
 */
void delayMs(unsigned int ms)
{
  for (int i = 0; i < ms; i++) {
    delayMicroseconds(1000);
  }
}
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This guide was first published on Sep 22, 2014. It was last updated on Sep 22, 2014.

This page (Program) was last updated on Sep 08, 2014.

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