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Fire Alarm Using BC547 Transistor: Yejju Veera Vamsi 20BEE0219

This document describes a fire alarm circuit designed by students using a BC547 transistor and infrared sensor. The circuit detects infrared radiation from fire and triggers a buzzer. It can detect different types of fires. When the infrared sensor detects fire, a voltage change turns on the transistor and allows current to flow to the buzzer. An automatic exhaust fan was also added to the design to evacuate smoke and reduce casualties in the event of a fire. The students successfully simulated the required circuit using PROTEUS software.

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4K views5 pages

Fire Alarm Using BC547 Transistor: Yejju Veera Vamsi 20BEE0219

This document describes a fire alarm circuit designed by students using a BC547 transistor and infrared sensor. The circuit detects infrared radiation from fire and triggers a buzzer. It can detect different types of fires. When the infrared sensor detects fire, a voltage change turns on the transistor and allows current to flow to the buzzer. An automatic exhaust fan was also added to the design to evacuate smoke and reduce casualties in the event of a fire. The students successfully simulated the required circuit using PROTEUS software.

Uploaded by

freeretdocs
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
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Name: Yejju Veera Vamsi Reg No: 20BEE0219

FIRE ALARM USING


BC547
TRANSISTOR

GROUP MEMBERS

Yejju Veera Vamsi - 20BEE0219


Akash Dey - 20BEE0169
Sahisnu Manna - 20BEI0042
ABSTRACT:
 In this project our objective is to design a simple and inexpensive
fire alarm circuit by using a transistor BC547 and an IR receiver
sensor.
 This Fire circuit alert through buzzer sound whenever any kind of
fire detected in the air or an environment.
 We are able to simulate the required circuit using PROTEUS

INTRODUCTION
In this project we have design a Simple and inexpensive fire alarm
circuit by using a transistor BC547 and an IR receiver sensor. This
Fire circuit alert through buzzer sound whenever any kind of fire
detected in the air or an environment. It can detect any kind of fire
such as radiation, heat, etc. Depending on the types of sensor that
matches an application is selected. In the market, most of the circuits
are expensive and difficult to buy. An Infrared Light sensor, on the
contrary, is sensitive and very easy to use.

TECHNICAL SPECIFICATIONS

COMPONENTS USED FOR SIMULATION:

1. FLAME SENSOR (Infrared IR LED)


2. LED-BIRY (LED for Indication)
3. NPN (Transistor BC547)
4. LOGICSTATE
5. BATTERY
6. RES (Resistor)
7. Wire for connections
8. Speaker
9. Motor
DESIGN APPROACH
 In this fire alarm circuit, we have used an infrared detector LED. The
infrared emitted from the fire is detected by the infrared LED and voltage
across the infrared led changed.
 The Anode of the infrared LED is connected with the base of the BC547
NPN transistor.
 Due to the positive pulse in the base, the transistor turns on and current can
flow in through buzzer –> Collector –> Emitter.
 If there is no fire then no positive pulse fed to the transistor base so the
BC547 transistor remains in off mode. So that time current cannot flow
through the buzzer.

ADDITION OF AUTOMATIC EXHAUST SYSTEM


 The exhaust system should be taken into consideration with the fire alarm
system.
 When the system detects fire, the motor will rotate the blades of the exhaust
fan. Since, it is connnected parallel to the speaker/buzzer.
 This is necessary as this would allow the system to evacuate the heat and
smoke from the fire.
 The exhaust system will significantly reduce the number of casualties from
asphyxiation/suffocation. Hence, it can act as a life saver.
CONCLUSION:
The fire alarm is a very useful device at home or industries to avoid
fire hazards. In this project we have successfully designed the fire
alarm circuit using the software PROTEUS. The addition of exhaust
system will significantly increase the efficiency of the fire alarm.

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