#include <Servo.h>

#define MQ2_PIN A0
#define BUZZER_PIN 7
#define SERVO_PIN 6

int gasThreshold = 400; // Adjust based on simulation
Servo myServo;

void setup() {
  pinMode(MQ2_PIN, INPUT);
    pinMode(BUZZER_PIN, OUTPUT);
      myServo.attach(SERVO_PIN);
        myServo.write(0); // initial position
          Serial.begin(9600);
          }

          void loop() {
            int gasValue = analogRead(MQ2_PIN);
              Serial.print("Gas Level: ");
                Serial.println(gasValue);

                  if (gasValue > gasThreshold) {
                      digitalWrite(BUZZER_PIN, HIGH);  // Turn buzzer ON
                          myServo.write(90);               // Rotate servo to 90°
                              Serial.println("⚠️ Gas Detected! Alarm ON + Servo Rotated");
                                } else {
                                    digitalWrite(BUZZER_PIN, LOW);   // Buzzer OFF
                                        myServo.write(0);                // Reset servo to 0°
                                          }

                                            delay(500);
                                            }