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Title: SMOKE DETECTOR
Description: how to built a smoke detector by using mq2 sensor
Description: how to built a smoke detector by using mq2 sensor
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Smoke Detector:
A Smoke Detector is a
smoke sensing device that indicates fire
...
Smoke Detectors
are very useful devices as the damage caused by fire accidents is
catastrophic
...
In
this project, we are implementing a simple Smoke Detector Circuit
using simple hardware
...
The article is
divided intoinformation about Smoke sensor, circuit diagram and
working
...
Optical or photoelectric
smoke detectors and Ionization smoke detectors
...
The photocell conducts as long as the light falls on it
...
1
Ionization smoke detectors consists of two electrodes and an
ionization chamber filled with ions
...
In the presence of smoke, the chamber is filled with smoke and
interrupts the movement of ions
...
Depending on the type of sensor and manufacturer, the
conductivity conditions may change but the idea remains the same
...
The sensor used in this project is MQ-2 Gas/Smoke sensor
...
It has two electrodes made of Aluminum Oxide (Al2O3) and a
heating element made of Tin dioxide (SnO¬2) which acts as the
main sensing layer
...
Components Required
MQ-2 Sensor
Project Title: Smoke Detector
LM358
10KΩ
Project Title: Smoke Detector
330Ω
LED
Project Title: Smoke Detector
0
...
Working:
Smoke Detectors are amazing devices as
they are small, cheap yet very useful
...
We used a Smoke Sensor MQ-2 as the main sensory device
...
LM358 acts as a comparator in this circuit
...
The output of LM358 is given to an LED as an indicator although
a buzzer can be used as an alarm
...
Initially, when the air is clean, the conductivity between the
electrodes is less, as the resistance is in the order of 50KΩ
...
The indicator LED is OFF
...
Project Title: Smoke Detector
This provides a higher input at the non-inverting terminal of
comparator than the inverting terminal and the output of
comparator is high
...
Note:
The heating element in the Smoke Sensor must be preheated
before it can sense any smoke or gas
...
The sensitivity of the circuit to different concentrations of
smoke can be adjusted by using the POT
...
The End
Project Title: Smoke Detector
Title: SMOKE DETECTOR
Description: how to built a smoke detector by using mq2 sensor
Description: how to built a smoke detector by using mq2 sensor