Arduino Fire Detector with Siren and LED | Step-by-Step Guide

Learn how to build a DIY fire alarm system using an Arduino, a flame sensor (HW-072), a piezo buzzer, and an LED! In this beginner-friendly tutorial, we’ll show you step-by-step how to connect and program the HW-072 flame sensor to detect fire and trigger a realistic two-tone fire truck siren using the tone() function. This project is perfect for school experiments, home automation safety prototypes, or learning how sensors work with Arduino. What You’ll Learn in This Video: How the HW-072 flame sensor works Understanding the IR photodiode and potentiometer Flame detection using the LM393 chip How to simulate a fire truck siren using Arduino Complete code walkthrough with LED and buzzer Tips for adjusting flame detection sensitivity and direction Components Used: Arduino Uno HW-072 Flame Sensor Module Piezo Buzzer LED Jumper Wires & Breadboard