Here we have used Buzzer as a Smoke alarm, which is driven by BC547 NPN transistor. We have previously built Smoke Detector Arduino Shield using MQ2 Gas Sensor, which not only sense the smoke in the ...

LCD displays "FIRE HIGH" or "SMOKE HIGH". GSM module sends an SMS alert to emergency contacts. System resets when no fire/smoke is detected. Code File 📂 Filename: fire_alarm_system.ino 📌 Language: ...