IR Remote with Arduino

What are infrared signals?

Video

What we are going to do?

• Connecting an IR receiver with Arduino UNO (you can use any Arduino).
• Using an example program to decode the IR signals from an IR remote.
• Save the decoded results and write code to perform a different operation from different IR signals

Hardware Needed

Components	Amazon.com	Amazon.in	Banggood	AliExpress
IR remote
IR receiver
Arduino UNO
Bread Board
Jumper Wires

IR Sensor Pinout

Circuit

Connect the circuit as follows.

Arduino	IR Receiver (TSOP 1738)
5v	VCC (2nd leg)
GND	GND (1st leg)
Digital Pin 11	OUT (3rd leg)

Note that there is a lot of different types of IR receivers so be careful when giving the connections, the pin(VCC, GND, OUT) might be shuffled in the model you are using.

Software & Libraries Needed

Softwares	Download
IR library for Arduino
Arduino IDE

• Download & Install The Library from here
• Then from Arduino IDE go to File -> Examples -> IRremote and open IRrecvDemo

Example Code

/*
 * IRremote: IRrecvDemo - demonstrates receiving IR codes with IRrecv
 * An IR detector/demodulator must be connected to the input RECV_PIN.
 * Version 0.1 July, 2009
 * Copyright 2009 Ken Shirriff
 * http://arcfn.com
 */

#include <IRremote.h>

int RECV_PIN = 11;

IRrecv irrecv(RECV_PIN);

decode_results results;

void setup()
{
  Serial.begin(9600);
  // In case the interrupt driver crashes on setup, give a clue
  // to the user what's going on.
  Serial.println("Enabling IRin");
  irrecv.enableIRIn(); // Start the receiver
  Serial.println("Enabled IRin");
}

void loop() {
  if (irrecv.decode(&results)) {
    Serial.println(results.value, HEX);
    irrecv.resume(); // Receive the next value
  }
  delay(100);
}

• Now go to tools and upload the code.
• Open the serial monitor and check if the decoded results are printing when pressing buttons on the IR remote.
• The output will be printed in HEX format as shown below

Now let’s connect an LED to one of the digital pins of Arduino and edit the above example to turn ON/OFF the LED using the IR remote.

Circuit With LED

Arduino	IR Receiver	LED
D9		Anode(+) via 220 Ohm resistor
D11	OUT
5V	VCC
GND	GND	Cathode(-)

Changes needed to make in the example code are:

• In the 29th line Serial.println(results.value, HEX); change HEX to DEC Serial.println(results.value, DEC);, because the decimal value is easy to work with while programming.
• Then upload the code and open the serial monitor and press any two buttons of your IR remote that you needed to function as the switch for the LED and note the values generated.
• Then we need to declare two integer constant called codeON and codeOFF for saving the values which we noted in the above step.
• Now declare a variable called code to save the live receiving values from the sensor.
• Then make the pin at which LED is connected as OUTPUT using the pinMode() function
• Then use an if else if block to check whether the received value is equal to the values saved in the constant codeON or codeOFF
• If the value in code is equal to the value in codeON then make the LED pin HIGH
• If the value in code is equal to the value in codeOFF then make the LED pin LOW

Code

/*
   IRremote: IRrecvDemo - demonstrates receiving IR codes with IRrecv
   An IR detector/demodulator must be connected to the input RECV_PIN.
   Version 0.1 July, 2009
   Copyright 2009 Ken Shirriff
   http://arcfn.com
*/

#include <IRremote.h>

int RECV_PIN = 11;

int codeON = 16744575;
int codeOFF = 16711935;

int code;

int LED = 9;

IRrecv irrecv(RECV_PIN);

decode_results results;

void setup()
{
  Serial.begin(9600);
  // In case the interrupt driver crashes on setup, give a clue
  // to the user what's going on.
  Serial.println("Enabling IRin");
  irrecv.enableIRIn(); // Start the receiver
  Serial.println("Enabled IRin");
  pinMode(LED, OUTPUT); digitalWrite(LED, LOW);
}

void loop() {
  if (irrecv.decode(&results)) {
    Serial.println(results.value, DEC);
    code = results.value, DEC;
    irrecv.resume(); // Receive the next value
  }

  if (code == codeON)
    digitalWrite(LED, HIGH);
  else if (code == codeOFF)
    digitalWrite(LED, LOW);

  delay(100);
}

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