const int ldrPin = 34;   
const int relayPin = 2; 
const int ledPin = 25;  
int ldrThreshold = 40;  
bool manualMode = false; 

void setup() {
  
  pinMode(ldrPin, INPUT);
  pinMode(relayPin, OUTPUT);
  pinMode(ledPin, OUTPUT);

 
  digitalWrite(relayPin, LOW);
  digitalWrite(ledPin, LOW);

  
  Serial.begin(115200);
  Serial.println("Smart Light Control System Initialized");
  Serial.println("Enter 'AUTO' for automatic control or 'ON'/'OFF' for manual control");
}

void loop() {
 
  if (Serial.available()) {
    String command = Serial.readStringUntil('\n');
    command.trim(); 

    if (command == "ON") {
      manualMode = true; 
      digitalWrite(relayPin, HIGH); 
      digitalWrite(ledPin, HIGH);
      Serial.println("Light is ON (Manual Mode)");
    } else if (command == "OFF") {
      manualMode = true; 
      digitalWrite(relayPin, LOW); 
      digitalWrite(ledPin, LOW); 
      Serial.println("Light is OFF (Manual Mode)");
    } else if (command == "AUTO") {
      manualMode = false; 
      Serial.println("Switched to Automatic Mode");
    } else {
      Serial.println("Invalid command. Use 'ON', 'OFF', or 'AUTO'.");
    }
  }

  
  if (!manualMode) {
    int ldrValue = analogRead(ldrPin);
    Serial.print("LDR Value: ");
    Serial.println(ldrValue);

    if (ldrValue < ldrThreshold) {
      digitalWrite(relayPin, HIGH);
      digitalWrite(ledPin, HIGH);
      Serial.println("Light is ON (Automatic)");
    } else {
      digitalWrite(relayPin, LOW);
      digitalWrite(ledPin, LOW);
      Serial.println("Light is OFF (Automatic)");
    }

    delay(1000); 
  }
}