Tutorial: Arduino IR sender and receiver

On this tutorial, we will show how to implement an IR sender and receiver with Arduino. To do this, you will need 2x Arduinos, 1x IR emitter, 1x IR receiver, 1x 200 ohm resistor, 1x push button, and 1x LED. You can use your TV remote as an IR transmitter.

First, you have to check the receiver pinout. Look at the datasheet, you should find something like that:

Connect your transmitter like the following picture:

Then, connect your receiver like that:

Before we get to the programming, download and install the IR library.

The sample program was extracted from the Arduino Cookbook book. Open your Arduino IDE and upload the following code:

/*
irSend sketch
this code needs an IR LED connected to pin 3
and 5 switches connected to pins 4 - 8
*/
#include <IRremote.h>
// IR remote control library
const int numberOfKeys = 1;
const int firstKey = 4;
// the first pin of the 5 sequential pins connected to buttons
boolean buttonState[numberOfKeys];
boolean lastButtonState[numberOfKeys];
long irKeyCodes[numberOfKeys] = {
    0x18E758A7, //0 key
};

IRsend irsend;
void setup()
{
    for (int i = 0; i < numberOfKeys; i++){
        buttonState[i]=true;
        lastButtonState[i]=true;
        int physicalPin=i + firstKey;
        pinMode(physicalPin, INPUT);
        digitalWrite(physicalPin, HIGH); // turn on pull-ups
    }
    Serial.begin(9600);
}
void loop() {
    for (int keyNumber=0; keyNumber<numberOfKeys; keyNumber++)
    {
        int physicalPinToRead=keyNumber+4;
        buttonState[keyNumber] = digitalRead(physicalPinToRead);
        if (buttonState[keyNumber] != lastButtonState[keyNumber])
        {
            if (buttonState[keyNumber] == LOW)
            {
                irsend.sendSony(irKeyCodes[keyNumber], 32);
                Serial.println("Sending");
            }
            lastButtonState[keyNumber] = buttonState[keyNumber];
        }
    }
}


Do the same with the receiver code:


/*

IR_remote_detector sketch
An IR remote receiver is connected to pin 2.
The LED on pin 13 toggles each time a button on the remote is pressed.
*/
#include <IRremote.h> //adds the library code to the sketch
const int irReceiverPin = 2; //pin the receiver is connected to
const int ledPin = 13; 
IRrecv irrecv(irReceiverPin); //create an IRrecv object
decode_results decodedSignal; //stores results from IR detector

void setup()
{
    pinMode(ledPin, OUTPUT);
    irrecv.enableIRIn();
}
boolean lightState = false;
unsigned long last = millis();

// Start the receiver object
//keep track of whether the LED is on
//remember when we last received an IR
void loop()
{
    if (irrecv.decode(&decodedSignal) == true) //this is true if a message has been received
    {
        if (millis() - last > 250) {
            //has it been 1/4 sec since last message
            lightState = !lightState;
            //toggle the LED
            digitalWrite(ledPin, lightState);
        }
        last = millis();
        irrecv.resume();
        // watch out for another message
    }
}

It's time to test! When you press the button, the LED on the other Arduino should switch on. When you press it again, the LED switch off.

References:

http://www.arcfn.com/2009_08_01_archive.html

http://arduino.cc/playground/

http://www.datasheetcatalog.org/datasheets/2300/301522_DS.pdf

Views: 35989

Tags: arduino, infrared, ir

Comment by Mitchell S. Lowther, Jr. on May 6, 2012 at 11:26pm

This is neat. I'm going to do this, but I need to purchase another 'duino first. 

Thanks for posting this!

Optional add-on:  if a speaker was added to the receiving unit as well, then you could have it emit a small tone in addition to lighting up the LED. Then a lower note when shutting off the led.  Just a thought...

 

Thanks!

Comment by lovakiranvarma on August 3, 2012 at 7:24pm

I think, this circuit range is less to detect the IR signal. To improve the range of the IR circuit, one should generate 38KHz signal as a carrier, I found in 

http://www.npeducations.com/2011/01/design-of-ir-transmitter-and-re...

off course you should need to increase the voltage required to drive the IR circuit

Comment by lunia on March 8, 2013 at 1:24am

hey..how about i just want to transmit data like 123 or abc..and i dont want to use irsend.sendSony because my project do not use remote

 

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