MQ131 Gas Sensor Module is meant to enable LPG detection interface to Microcontroller without ADC Channels. It allows to work out when a preset LPG gas level has been reached or exceeded. Interfacing with the sensor module is completed through a 4-pin SIP header and requires One I/O pin from the host microcontroller.
The onboard microcontroller provide initial heating interval after powerup then starts to meassure LPG sensor output.If it found the LPG contents above setted value, it'll inform the Host controller by pulling the Output Pin to High and Starts to blink aonboard status LED. The sensor module is especially intended to supply a way of comparing LPG sources and having the ability to line an alarm limit when the source becomes excessive.
A basic gas sensor module has 6 terminals during which 4 terminals (A, A, B, B) acts input or output and therefore the remaining 2 terminals (H, H) are for heating the coil. of those 4 terminals, 2 terminals from all sides are often used as either input or output.
These modules contains the gas sensor and a comparator IC. Now let’s see the pin description of the gas sensor module which we'll generally use with an Arduino. The gas sensor module basically consists of 4 terminals:Vcc – Power supply and GND – Power supply. Digital output – This pin gives an output either in logical high or logical low (0 or 1) meaning it displays the presence of any toxic or combustible gases near the sensor.
Analog output – This pin gives an output continuous in voltage which varies supported the concentration of gas that's applied to the gas sensor.
Sensitive material of MQ131 gas sensor is O3 SnO2, which with lower conductivity in clean air. When Ozone gas exists. The sensor’s conductivity is more higher along side the gas concentration rising. Please use simple electro circuit, Convert change of conductivity to correspond output of gas concentration. MQ131 gas sensor has high sensitivity to Ozone, also sensitive to O3 CL2, NO2, etc.
