// Define pin numbers
const int gasSensorPin = A0;  // Analog pin for gas sensor
const int gasDetectionLedPin = 7;  // Digital pin for gas detection LED
const int servoControlPin = 9;  // Digital pin for servo motor control
const int servoMovementLedPin = 8;  // Digital pin for servo movement LED

// Define threshold for gas concentration (adjust as needed)
const int gasThreshold = 500;

#include <Servo.h>

Servo myServo;  // Create a servo object to control the servo motor

void setup() {
  // Initialize serial communication for debugging
  Serial.begin(9600);

  // Attach servo to the control pin
  myServo.attach(servoControlPin);

  // Set LED pins as output
  pinMode(gasDetectionLedPin, OUTPUT);
  pinMode(servoMovementLedPin, OUTPUT);
}

void loop() {
  // Read analog value from gas sensor
  int gasConcentration = analogRead(gasSensorPin);

  // Print gas concentration for debugging
  Serial.print("Gas Concentration: ");
  Serial.println(gasConcentration);

  // Check if gas concentration exceeds the threshold
  if (gasConcentration > gasThreshold) {
    // Gas detected
    digitalWrite(gasDetectionLedPin, HIGH);  // Turn on gas detection LED

    // Move servo motor to simulate valve opening
    myServo.write(180);  // Adjust the angle based on your servo's specifications

    // Turn on servo movement LED
    digitalWrite(servoMovementLedPin, HIGH);
  } else {
    // No gas detected
    digitalWrite(gasDetectionLedPin, LOW);  // Turn off gas detection LED

    // Move servo motor to simulate valve closing
    myServo.write(0);  // Adjust the angle based on your servo's specifications

    // Turn off servo movement LED
    digitalWrite(servoMovementLedPin, LOW);
  }

  // Optional: Implement a delay before closing the valve after gas is no longer detected
  delay(5000);  // Adjust the delay time as needed
}