Project Banao Fire & Smoke Detection Robot Model Project Kit | Arduino UNO MQ-2 Gas & Smoke Sensor with LCD Display, Buzzer & DIY Electronics Components | STEM Science Project for School Students

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

LiquidCrystal_I2C lcd(0x27, 16, 2); // Some LCDs use 0x3F
const byte gasPin = A0;
const byte buzzerPin = 8;
const int alertThreshold = 400; // Example only; tune safely

void setup() {
pinMode(buzzerPin, OUTPUT);
digitalWrite(buzzerPin, LOW);
Serial.begin(9600);
lcd.init();
lcd.backlight();
lcd.setCursor(0, 0);
lcd.print(“Fire/Smoke Demo”);
lcd.setCursor(0, 1);
lcd.print(“Sensor warming”);
delay(2000);
}

void loop() {
int gasValue = analogRead(gasPin);
bool alert = gasValue >= alertThreshold;
Serial.println(gasValue);

lcd.clear();
lcd.setCursor(0, 0);
lcd.print(alert ? “ALERT: CHECK AIR” : “Status: NORMAL”);
lcd.setCursor(0, 1);
lcd.print(“Sensor: “);
lcd.print(gasValue);

digitalWrite(buzzerPin, alert ? HIGH : LOW);
delay(500);
}