Sensor of smoke
Download as PPTX, PDF5 likes2,161 views
This document describes a simple smoke detector circuit that uses a MQ6-MQ2 smoke/gas sensor to detect smoke or fire. The circuit triggers a buzzer alarm when smoke is detected near the sensor. It uses a BC547 NPN transistor to drive the buzzer. When smoke is sensed, the sensor's resistance decreases, causing the voltage at the transistor's base to increase above 0.7V, turning the transistor on and activating the buzzer alarm. The circuit was built on a breadboard and its workings are explained.
![Regents Biology 2015/2016
[ Smoke Sensor ]
Mohamed M.Elsaied
2017/2018
Supervised by :- Dr. Mohamed Ismail Badwey
Allied Medical Science
Medical equipment technology](https://image.slidesharecdn.com/sensorofsmoke-180106142503/85/Sensor-of-smoke-1-320.jpg)
Sensor of smoke
- 1. Regents Biology 2015/2016 [ Smoke Sensor ] Mohamed M.Elsaied 2017/2018 Supervised by :- Dr. Mohamed Ismail Badwey Allied Medical Science Medical equipment technology
- 2. Introduction Mohamed M.Elsaied 2017/2018 Smoke Detectors are very useful in detecting smoke or fire (GAS) in buildings, and so are the important safety parameters. In this project, we are going to build a Simple Smoke Detector Circuit without using any Microcontroller. This circuit triggers the Buzzer whenever it detects Smoke or fire near by it. This circuit mainly uses MQ6-MQ2 Smoke/Gas sensor to detect the level of smoke. MQ6 –MQ2 gas sensor is also sensible to LPG, Alcohol, and Methane etc. Here we have used Buzzer as a Smoke alarm, which is driven by BC547 NPN transistor.
- 3. Circuit Diagram Mohamed M.Elsaied 2017/2018
- 4. Components Required Mohamed M.Elsaied 2017/2018 BC547 Smoke Sensor (MQ2/MQ6) 1K 10k POT Power Supply LED Buzzer Connecting wire Jumper wire
- 5. Mohamed M.Elsaied 2017/2018 Smoke Sensor (MQ2/MQ6)
- 6. Mohamed M.Elsaied 2017/2018 Smoke Sensor (MQ2/MQ6)
- 7. Smoke circuit in Bread Board Mohamed M.Elsaied 2017/2018
- 8. General Explanation: Mohamed M.Elsaied 2017/2018 Working of this Smoke Detector Alarm Circuit is easy. In this project, we have used transistor operating properties to work this circuit as a smoke detector. As we already know that we have used a BC547 NPN transistor which will turn on whenever it gets least 0.70v at its base terminal. So we have applied a Voltage Divider Circuit at its base .
- 9. Mohamed M.Elsaied 2017/2018 But before using this circuit, we need to calibrate it by using pot. In calibration, we have applied voltage just below than 0.70v at transistor base. Whenever smoke sensor senses smoke, it reduces its resistance and due to this decrease in resistance, voltage across the base of the transistor increases. Working Explanation:
- 10. Mohamed M.Elsaied 2017/2018 Now when the voltage at the base terminal of transistor become more than or equal to 0.70v then transistor turns on and LED lights up and buzzer also starts beeping. And when there is no Smoke, both the indication components turns off as the voltage across base terminal of transistor goes below the 0.70v.
- 12. Mohamed M.Elsaied 2017/2018 Video to explain that