Recording/Decoding IR codes of IR remote using Arduino/ESP8266

To control appliances/devices with Arduino through IR Transmitter it is necessary to know the code of each button of IR remote and its protocol. This is discussed in this Article [[toc]]

Introduction

To control an appliance with Arduino through IR Transmitter, we have to first record IR codes of a remote and which protocol it uses. To do so its rather simple *(You know library makes everything EZ PZ) *. This simple -

1. Just Connect 3 terminal IR Sensor to Arduino or ESP8266 or NodeMCU
2. Upload IR Recorder Code
3. Note down code different codes corresponding to different buttons on a remote.
4. Also, Note its Protocol.
5. Now use that codes to control your favorite (maybe not) appliances.

IR Sensor /Reciever

An IR sensor catches any IR signal or radiation that incident on it, it will give only garbage data.To make it usable, one of the units/IC called "Band pass filter " is attached to it, it groounds / rejects every signal other than 32 kHz(in this article we will be using 38Khz IR Reciever Module). Other things are also connected, like below //ir4 pic
So to make an IR receiver module is hard as saving Gotham city from bane (Yes, Bane). So the use of the module is recommended.

Components Required

1. Arduino or NodeMCU
2. IR Receiver module (Any 38Khz module) , recommended -TSOP382 ,TSOP1738 CHQ1838

Recording IR Codes

Wiring

TSOP382

Vcc -- 5V
GND -- GND
Data to pin 11 (Only Arduino, For ESP8266/NodeMCU it can be defined in sketch)

Code

Open Example IRremote -> IRrecvDemo

#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);
}

Then open serial monitor

Note this data and put in IR Transmitter Sketch.

IR transmitter, Control your TV/ AC etc with Arduino/ESP8266