MQ2 gas sensor operates on the principle of detecting various gases by measuring their resistance changes in response to the presence of those gases in the environment.
It is capable of detecting a wide range of gases including LPG, propane, hydrogen, methane, alcohol, smoke, and various other combustible gases.
The sensor's sensitive material is tin dioxide (SnO2) which has high sensitivity towards gases, making it suitable for detecting even low concentrations of certain gases.
MQ2 provides analog output voltage that varies in proportion to the concentration of the detected gas, allowing for easy interfacing with microcontrollers or analog-to-digital converters.
It contains a built-in heating element which helps in achieving a stable operating temperature for the sensor, ensuring accurate and consistent readings.
The sensor requires a preheat time before it can provide accurate readings, typically around a few minutes. This preheat time allows the sensor to reach its optimal operating temperature.
MQ2 gas sensor is commonly used in gas leak detection systems in homes, industries, and automobiles to provide early warning of potential gas leaks, thereby preventing accidents.
These sensors are relatively inexpensive and readily available in electronic component stores, making them accessible for hobbyist projects as well as commercial applications.
While MQ2 sensors are effective for detecting a range of gases, they may not be highly selective and can sometimes give false readings in the presence of certain environmental factors.
Learn how to use MQ2 gas sensor using Arduino Uno