MQ Series are a set of gas sensors that are used to identify different types of gases. They are very useful in measuring the gas concentration and can be used in sensitive areas such as chemical industries. Each type of MQ sensor is designed to detect specific gases. We’ve a lot of MQ sensors. Some most commonly used ones are:-
A MQ sensor has 4 pins and many other components, depicted in the image below :
| Sensor | Used in the detection of |
| MQ-2 | Combustible gas, smoke |
| MQ-3 | Alcohol |
| MQ-4 | Methane, propane, butane |
| MQ-5 | Natural gas, LPG |
| MQ-6 | Propane, LPG |
| MQ-7 | Carbon monoxide |
| MQ-8 | Hydrogen |
| MQ-9 | Carbon monoxide, methane |
| MQ-135 | Ammonia sulfide, benzene vapour |
A MQ sensor has 4 pins and many other components, depicted in the image below :
How to use
Tutorial –
https://randomnerdtutorials.com/guide-for-mq-2-gas-smoke-s
Common Applications
1. Used in factories to monitor chemical exposure level.
2. Used in smoke detectors.
3. Used to check alcohol levels.
Some example projects that students can try out in the ATL Lab
1. Checking alcohol level using MQ-2 and Arduino (https://www.youtube.com/watch?v=yWKfuP9BhhI)
YouTube Video
Safety Measures to follow
1. Don’t release poisonous gases in excess just for the sake of testing them.
Important Links
1. A brief intro on MQ sensors (https://youtu.be/XHoOtEGetJc)
YouTube Video
2. How to make a smoke detector alarm (https://youtu.be/RsVhuZXOv_c)
YouTube Video
