// Pin Definitions
const int tempSensorPin = A0;      // Analog pin for temperature sensor (e.g., LM35)
const int pirSensorPin = 2;        // Digital pin for PIR motion sensor
const int relayPin = 8;            // Digital pin for relay control (bulb ON/OFF)

// Variables
float temperature = 0.0;           // To store temperature value
bool motionDetected = false;       // To store PIR motion status

void setup() {
  pinMode(pirSensorPin, INPUT);    // PIR sensor input
    pinMode(relayPin, OUTPUT);       // Relay output control
      Serial.begin(9600);              // Start serial monitor
      }

      void loop() {
        // Read Temperature Sensor (e.g., LM35 gives 10mV/°C)
          int tempSensorValue = analogRead(tempSensorPin);
            temperature = (tempSensorValue * 5.0 / 1023.0) * 100.0;  // Convert analog value to °C
              
                // Read PIR Motion Sensor
                  motionDetected = digitalRead(pirSensorPin);
                    
                      // Print values to Serial Monitor
                        Serial.print("Temperature: ");
                          Serial.print(temperature);
                            Serial.print(" °C | Motion Detected: ");
                              Serial.println(motionDetected ? "YES" : "NO");

                                // Logic to Control the Bulb
                                  if (temperature > 25 && motionDetected) {
                                      digitalWrite(relayPin, HIGH);  // Turn ON the bulb
                                          Serial.println("Bulb ON");
                                            } else {
                                                digitalWrite(relayPin, LOW);   // Turn OFF the bulb
                                                    Serial.println("Bulb OFF");
                                                      }
                                                        
                                                          delay(500);  // Small delay for stability
                                                          }