Build an ESP32 IR Learning Remote Demo

// ESP32 IR receive-and-send learning demo
// Learn codes from your own remote before transmitting.
#include <IRremote.hpp>

const int IR_RECV_PIN = 15;
const int IR_SEND_PIN = 4;

uint16_t learnedAddress = 0;
uint16_t learnedCommand = 0;
decode_type_t learnedProtocol = UNKNOWN;
bool hasLearnedCode = false;

void setup() {
  Serial.begin(115200);
  IrReceiver.begin(IR_RECV_PIN, ENABLE_LED_FEEDBACK);
  IrSender.begin(IR_SEND_PIN);
  Serial.println("IR demo ready. Point a safe consumer remote at the receiver.");
}

void loop() {
  if (!IrReceiver.decode()) return;

  Serial.println("IR signal received");
  Serial.print("Protocol: ");
  Serial.println(getProtocolString(IrReceiver.decodedIRData.protocol));
  Serial.print("Address: 0x");
  Serial.println(IrReceiver.decodedIRData.address, HEX);
  Serial.print("Command: 0x");
  Serial.println(IrReceiver.decodedIRData.command, HEX);

  if (IrReceiver.decodedIRData.protocol == NEC) {
    learnedProtocol = NEC;
    learnedAddress = IrReceiver.decodedIRData.address;
    learnedCommand = IrReceiver.decodedIRData.command;
    hasLearnedCode = true;
    Serial.println("Stored NEC code. Send it back by opening Serial Monitor and typing s.");
  } else {
    Serial.println("This sketch retransmits NEC only. Use raw examples for other protocols.");
  }

  IrReceiver.resume();

  if (Serial.available()) {
    char c = Serial.read();
    if ((c == 's' || c == 'S') && hasLearnedCode && learnedProtocol == NEC) {
      IrSender.sendNEC(learnedAddress, learnedCommand, 2);
      Serial.println("Sent learned NEC command.");
    }
  }
}