#include <Wire.h>
#include <LiquidCrystal_I2C.h>

#define MQ2_PIN 35  // Analog pin for MQ-2 sensor
#define GAS_THRESHOLD 300  // Adjust threshold as needed

// Initialize LCD (I2C address 0x27, 16 columns, 2 rows)
LiquidCrystal_I2C lcd(0x27, 16, 2);

void setup() {
    Serial.begin(115200);
    lcd.init();
    lcd.backlight();

    lcd.setCursor(0, 0);
    lcd.print(" MQ-2 Gas Sensor ");
    delay(2000);
    lcd.clear();
}

void loop() {
    int gasValue = analogRead(MQ2_PIN);  // Read MQ-2 sensor value
    Serial.print("Gas Value: ");
    Serial.println(gasValue);

    lcd.setCursor(0, 0);
    lcd.print("Gas Level: ");
    lcd.print(gasValue);

    // Alert if gas level exceeds threshold
    lcd.setCursor(0, 1);
    if (gasValue > GAS_THRESHOLD) {
        lcd.print("ALERT! HIGH GAS");
    } else {
        lcd.print("SAFE           ");
    }

    delay(1000);  // Update every second
}