// Date: 08/12/2025
// Experiment No: 08
// Name: Rajaram Parida
// Redg: 2241016203
// Section: 224101028

// Objective 3


#include <SoftwareSerial.h>

SoftwareSerial BT(2, 3);  // RX, TX
int ledPin = 6;
String cmd = "";

void setup() {
  Serial.begin(9600);
  BT.begin(9600);

  pinMode(ledPin, OUTPUT);

  Serial.println("Bluetooth HC-06 Ready");
  BT.println("Hello! HC-06 connected.");
}

void loop() {

  // ******** RECEIVE FROM BLUETOOTH ********
  if (BT.available()) {
    char c = BT.read();
    cmd += c;

    if (c == '\n') {  
      cmd.trim();
      Serial.println("Received from BT: " + cmd);

      if (cmd == "ON") {
        digitalWrite(ledPin, HIGH);
        BT.println("LED TURNED ON");
      }
      else if (cmd == "OFF") {
        digitalWrite(ledPin, LOW);
        BT.println("LED TURNED OFF");
      }
      else if (cmd == "STATUS") {
        BT.println(digitalRead(ledPin) ? "LED=ON" : "LED=OFF");
      }
      else {
        BT.println("Unknown Command");
      }
      cmd = "";
    }
  }

  // ******** SEND DATA BACK TO PHONE ********
  if (Serial.available()) {
    BT.print("PC: ");
    BT.write(Serial.read());
  }
}