This Presentation is about Fire Alarm Circuit, covering up some basic concepts and advantages and disadvantages of Fire Alarm. Hope it will help you.

1. FIRE
ALARM
CIRCUIT
 Group Members:
 Aitazaz Qureshi CIIT/FA19-BCE-050/ISB
 Wasay Zafar CIIT/FA19-BCE-003/ISB
 Abdullah Mansoor CIIT/FA19-BCE-024/ISB

2. FIRE ALARM
INTRODUCTION COMPONENTS CIRCUIT DIAGRAM WORKING ADVANTAGES &
DISADVANTAGES
FUTURE SCOPE

3. INTRODUCTION:
A simple potential divider arrangement using
thermistor is capable of sensing the temperature,
(presence of fire) and alerting us with a warning
signal. This is suitable for our home security
systems.

4. Components Required:
Breadboard
Resistor
1k
Capacitor
10µF
1N4001 Diode LED
Potentiometer
10k
Thermistor
100K ntc
Buzzer &
9V Voltage
Source

5. Working:
The main parts of
this circuit are the
thermistor, diode
and the transistor.
When an external
heat is experienced
by the thermistor, its
resistance decreases.
The decrease in the
resistance allows a
small amount of
current to pass.

6. Working: (CONTINUED)
The current is derived through the diode towards the base of the transistor.
This allows the transistor to act as an open switch and current to pass through the collector and emitter of
the transistor.
This results in the execution of the output components, and the LED turns on the Buzzer starts to BEEP.

7. CIRCUIT DIAGRAM

8. PROJECT OVERVIEW

9. Applications:
Home Security
System.
School/College
Labs.
Industries. Research &
Development Cells.

10. Advantages:
Sensing of
fire(Heat) easily.
Simple Circuit. Low Power
Consumption.
Low Cost.

11. Disadvantages:
No longer use. Senses near by Fire(Heat)
only.
Requires continuous
Power Supply.

12. FUTURE SCOPE:
To overcome disadvantages and looking for
implementation of Automatic FIRE detection.
In the place of Thermistor we have to use
Sensors.
Uses of Speakers instead of Thermistor with
warning message of Audio alert signal.

13. The End.