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Fire Alarm System

Er Yogendra Singh Rajput December 12, 2025
Fire Alarm System - Electrical Project
Safety Electronics Project

Fire Alarm
System

Build an automatic heat detection and warning system. Master Thermistors, Comparators, and Safety Logic Circuits.

Get Presentation Slides (PPT)

CIRCUIT LAB

SAFE

Heat Source

Thermistor

Buzzer

COOL (25°C) HOT (100°C)

Resistance

HIGH

Comparator

LOW

Output

OFF
Project Workflow

How It Works

1

Detection

The Thermistor (NTC) senses temperature. As heat rises, its resistance drops significantly.

2

Voltage Shift

A potential divider circuit translates the resistance change into a voltage drop.

3

Comparison

An Op-Amp/Transistor compares this voltage against a set threshold (Reference).

4

Alarm

When threshold is crossed, the circuit switches ON the Buzzer and Relay (for sprinklers).

Bill of Materials (BOQ)

Thermistor

10k NTC Sensor

Transistor/IC

BC547 or LM358

Active Buzzer

5V/9V Piezo

Potentiometer

10k Preset (Sensitivity)

Popular Search Terms

Fire Alarm Circuit Project Thermistor Heat Sensor Electrical Engineering Final Year Automatic Sprinkler System School Science Exhibition Model Safety Electronics PDF

Trending Hashtags

#FireAlarm #ElectronicsProject #SafetyTech #DIYCircuit #SensorIntegration #StudyForNext #EngineeringProject

EDUCATIONAL PURPOSE ONLY

This project is a prototype. It is not a replacement for certified industrial fire safety equipment. Always test circuits in a safe environment. Intellectual property belongs to Study For Next.

© 2024 Study For Next. Electrical Engineering Dept.
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