The pot is used to adjust the sensitivity. Pin 1 is VCC, Pin 2 is the GND, Pin 3 is the Digital out (Logic low when gas is detected.) and Pin 4 is the Analog output. However, the left image is a module-based MQ6 sensor for interfacing with the microcontroller unit, the pin diagram of the module is also shown in that image. The below image shows the MQ6 sensor pin diagram. Sensorīenzene, Toluene, Alcohol, Acetone, Propane, Formaldehyde gas, Hydrogen However, by using the same hardware and firmware other MQ series sensors can also be used without major modification in the code and hardware part. For the sake of this article, we will be using the MQ6 Gas sensor with PIC that can be used to detect the LPG gas presence and concentration. In this article, we will learn how to use these gas sensors with PIC Microcontrollers, to measure the PPM value of the gas and display it on a 16x2 LCD.Īs mentioned earlier, there are different kinds of MQ series sensors available in the market and each sensor can measure different types of gases as shown in the table below. We have already used these MQ gas sensors with Arduino to measure some harmful gases like Ammonia. These sensors are widely used in all Gas related devices like from simple Smoke Detectors to Industrial Air Quality Monitors. MQ series Gas sensors are very common types of sensors used in Gas Detectors to detect or measure certain types of Gases.
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