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

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

const int gasSensorPin = A0;
const int buzzerPin = 8;
const int gasThreshold = 400; // Adjust as needed

void setup() {
  pinMode(buzzerPin, OUTPUT);
  digitalWrite(buzzerPin, LOW);

  lcd.begin(16, 2);         // Corrected: requires rows and columns
  lcd.backlight();

  lcd.setCursor(0, 0);
  lcd.print("Gas Detector");
  delay(2000);
  lcd.clear();
}


void loop() {
  int gasLevel = analogRead(gasSensorPin);

  lcd.setCursor(0, 0);
  lcd.print("Gas: ");
  lcd.print(gasLevel);
  lcd.print("     "); // Padding to clear digits

  if (gasLevel > gasThreshold) {
    digitalWrite(buzzerPin, HIGH);
    lcd.setCursor(0, 1);
    lcd.print("!!! ALERT !!!   ");
  } else {
    digitalWrite(buzzerPin, LOW);
    lcd.setCursor(0, 1);
    lcd.print("Safe            ");
  }

  delay(500);
}