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: 55224

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

 

Comment

You need to be a member of GarageLab (arduino, electronics, robotics, hacking) to add comments!

Join GarageLab (arduino, electronics, robotics, hacking)

Latest Activity

Profile IconPablo Orellana S and Mr Abraham Akim joined GarageLab (arduino, electronics, robotics, hacking)
6 hours ago
GarageLab posted blog posts
12 hours ago
GarageLab posted a blog post

Drop runs through maze alone

A alcohol's drops seems to have gained life - or at least behave as if they know what they are…See More
Monday
Profile IconFrank H., KHUSHBOO AGARWAL, Christopher LaFave and 1 more joined GarageLab (arduino, electronics, robotics, hacking)
Monday
GarageLab posted a blog post
Jan 22
awet kidane commented on GarageLab's blog post Tutorial: Using GPS Shield as an Anti-Theft Device
"how can i simulate gps  in proteus "
Jan 21
GarageLab posted blog posts
Jan 21
Profile Iconawet kidane, Ken Cofer and Burula Oleg joined GarageLab (arduino, electronics, robotics, hacking)
Jan 21
GarageLab posted blog posts
Jan 19
Colin Green updated their profile
Jan 19
Profile Iconjack, soe, Colin Green and 1 more joined GarageLab (arduino, electronics, robotics, hacking)
Jan 19
Mafaz commented on Thulana Vimukthi's blog post GPS GUIDED AUTONOMOUS ROBOT
"Dear sir , I am doing a project on "Design and Development of Human Following Robot" . In…"
Jan 18
Shannon Bradley replied to Shannon Bradley's discussion Nikola Tesla
"http://www.edisontechcenter.org/tesladebunked.html Thank you Jilt, I'm not sure why my…"
Jan 16
GarageLab posted blog posts
Jan 15
jlt1945 replied to Shannon Bradley's discussion Nikola Tesla
Jan 14
Shannon Bradley posted a discussion
Jan 14
Mafaz is now a member of GarageLab (arduino, electronics, robotics, hacking)
Jan 14
Ron Reiserer replied to Raghuvir G's discussion Digital IO – PIR Sensor – Arduino for Beginners
"I'm not sure why the sketch for that project uses an analog read function. Most of those PIR…"
Jan 13
GarageLab posted blog posts
Jan 13
Profile IconDinesh S, Marcin Bilinski, Sauvik Ray and 2 more joined GarageLab (arduino, electronics, robotics, hacking)
Jan 13

© 2015   Created by Marcelo Rodrigues.

Badges  |  Report an Issue  |  Terms of Service