#include <SoftwareSerial.h>
SoftwareSerial HC06(2,3);
int redLED = 6;
int yellowLED = 7;
int greenLED = 8;


void setup() {
 Serial.begin(9600);      // Start serial communication with the Serial Monitor
 HC06.begin(9600);
  // Initialize LED pins as output
 pinMode(redLED, OUTPUT);
 pinMode(yellowLED, OUTPUT);
 pinMode(greenLED, OUTPUT);


 // Turn off all LEDs at the start
 digitalWrite(redLED, LOW);
 digitalWrite(yellowLED, LOW);
 digitalWrite(greenLED, LOW);


 Serial.println("Bluetooth Controlled Traffic Light Ready");

}

void  loop() {
  // Check if data is available from the Bluetooth module
 if (BTSerial.available()) {
   char command = BTSerial.read();  // Read the incoming command
   Serial.print("Command received: ");
   Serial.println(command);


   // Control the traffic lights based on the command received
   if (command == 'r') {
     // Turn on Red LED, turn off others
     digitalWrite(redLED, HIGH);
     digitalWrite(yellowLED, LOW);
     digitalWrite(greenLED, LOW);
   }
   else if (command == 'y') {
     // Turn on Yellow LED, turn off others
     digitalWrite(redLED, LOW);
     digitalWrite(yellowLED, HIGH);
     digitalWrite(greenLED, LOW);
   }
   else if (command == 'g') {
     // Turn on Green LED, turn off others
     digitalWrite(redLED, LOW);
     digitalWrite(yellowLED, LOW);
     digitalWrite(greenLED, HIGH);
   }
   else if (command == '0') {
     // Turn off all LEDs
     digitalWrite(redLED, LOW);
     digitalWrite(yellowLED, LOW);
     digitalWrite(greenLED, LOW);
   }
 }
}


// HC-06 Bluetooth Module Connection: TX = 2, RX =3, and 5 V / GND
// In Arduino IDE Serial Monitor, set 'No Line Ending'
// Enter 'AT' to get 'OK' response, then
// Enter 'AT+NAMEBT1234' to set HC-06 Module Name to 'BT1234'
// Enter 'AT+PIN1234' to set HC-06 Module PIN to '1234'

// Recommended Smartphoe App for connection is
// Arduino Bluetooth Control by broxcode