MQ-4 Natural Gas Sensor Module For Methane(CNG) gas Detector Module

Package Includes:

• 1 x MQ4 Gas Sensor Module

Specifications:

• Datasheet

1. What are gas sensors? How do they work?

• Gas sensors (also known as gas detectors) are electronic devices that detect and identify different types of gasses. They are commonly used to detect toxic or explosive gasses and measure gas concentration. 
  Gas sensors detect the presence or concentration of gases in the atmosphere. Based on the concentration of the gas the sensor produces a corresponding potential difference by changing the resistance of the material inside the sensor, which can be measured as output voltage. Based on this voltage value the type and concentration of the gas can be estimated.

2. How to use the MQ4 Gas Sensor?

• As soon as the module is powered, the power LED lights up. The MQ-4 works by sensing the methane concentration in the air. The analog pin of the sensor then generates an analog signal proportional to the amount of CH4 in the air. We can measure the analog output of a sensor with an ADC microcontroller. The microcontroller then converts the measured analog voltage into Methane concentration in the air. Based on this measurement, we can take proper actions such as alarm triggering, etc. 
  Similarly, the same goes for the digital output pin of the MQ4 methane sensor. When methane gas is detected, the digital pin goes HIGH and the Digital output inbuilt led glows up. This digital pin can also be used for different activities being commanded by a microcontroller.

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