Example Code for Arduino-Infrared Remote Communication

Hardware Preparation

• DFRduino UNO R3 x2
• IO Expansion Shield x2
• Digital IR Receiver x1
• IR Transmitter Module x1

Software Preparation

• Arduino IDE
• Get Arduino library Arduino-IRremote and install it

Wiring Diagram

• IR Transmitter: same as above, Notice: Arduino-IRremote only supports D3 as transmitter.
• IR Receiver: connet it to D11 port.

Step by Step

• Open Arduino IDE
• Upload code to the UNO connected with IR Transmitter:

 #include <IRremote.h>

 IRsend irsend;

 void setup()
 {
 }

 void loop() {

     irsend.sendRC5(0x0, 8); //send 0x0 code (8 bits)
     delay(200);

     irsend.sendRC5(0x1, 8);
     delay(200);
 }

• Upload code to the UNO connected with IR Receiver:

 #include <IRremote.h>

 const int RECV_PIN = 11;
 const int LED_PIN = 13;

 IRrecv irrecv(RECV_PIN);

 decode_results results;

 void setup()
 {
   Serial.begin(9600);
   irrecv.enableIRIn(); // Start the receiver
 }

 void loop()
 {

   if (irrecv.decode(&results))
   {
     if ( results.bits > 0 )
     {
       int state;
       if ( 0x1 == results.value )
       {
         state = HIGH;
       }
       else
       {
        state = LOW;
       }

       digitalWrite( LED_PIN, state );
     }

     irrecv.resume();        // prepare to receive the next value
   }
 }

Result

The "L" LED of the shield connected with IR Receiver will blink when IR Receiver faces to IR Transmitter.