Scribd
Upload
41 views3 pages

Fire Alarm Project EEE Final

The document outlines a project to design a low-cost fire alarm system that detects heat or fire using an infrared receiver, buzzer, and LED. It details the required components, working principle, setup procedure, and testing method. The project serves as an educational tool for beginners in electronics, demonstrating the use of transistors and IR sensors in alert systems.

Uploaded by

mdrifatjahan03
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
41 views3 pages

Fire Alarm Project EEE Final

The document outlines a project to design a low-cost fire alarm system that detects heat or fire using an infrared receiver, buzzer, and LED. It details the required components, working principle, setup procedure, and testing method. The project serves as an educational tool for beginners in electronics, demonstrating the use of transistors and IR sensors in alert systems.

Uploaded by

mdrifatjahan03
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
You are on page 1/ 3

Fire Alarm Project

Objective

To design a simple and low-cost fire alarm system that can detect the presence of heat or fire and provide an

alert using a buzzer and LED.

Components Required

1. BC547 Transistor (NPN) - 1 piece

2. Infrared Receiver LED - 1 piece

3. 220-ohm Resistor - 1 piece

4. 5mm LED - 1 piece

5. DC Buzzer - 1 piece

6. 5V DC Power Supply or 9V Battery

7. Breadboard

Working Principle

This fire alarm circuit works based on the interruption of infrared (IR) signals. The IR receiver detects

changes in temperature caused by fire (or flame), which alters the voltage across the components. This

change activates the transistor, triggering the buzzer and LED to alert the user.

Procedure

1. Circuit Setup: Place all components on a breadboard according to the circuit diagram (optional if you want

to include one later). Connect the IR receiver LED so that it can detect any flame/heat source.

2. Connect the Resistor & LED: Use the 220-ohm resistor in series with the LED to limit current. Connect the

LED so that it turns ON when the fire is detected.

3. Transistor Configuration: Connect the BC547 transistor in common emitter mode. The IR receiver's output

is connected to the base of the transistor.

4. Buzzer Integration: Connect the DC buzzer to the collector of the transistor. When a fire is detected, the

transistor conducts and the buzzer sounds.

5. Power Supply: Use a 5V DC supply or a 9V battery to power the circuit.

6. Testing: Bring a flame (like a lighter) near the IR receiver. The buzzer should start ringing and the LED will

glow, indicating the presence of fire.


Fire Alarm Project

Result

When the circuit detects a flame or significant heat, it activates the buzzer and LED, successfully alerting the

presence of fire.

Conclusion

This project demonstrates a basic fire detection system using minimal components. It is suitable for

beginner-level electronics students and helps understand the practical application of transistors, IR sensors,

and alert systems.


Fire Alarm Project

Fire Alarm Circuit Diagram

You might also like