Closed lailomah closed 3 years ago
The sensors have always 6 pins but only 4 are really used. I don't have the documentation of your module. So, it is difficult to know the parameters of the breakout module. Do you have some doc?
The result of the sensor is a resistance ratio. The resistance ratio is computed based on the sensitivity curves of the sensor as defined in the datasheet. The formula are in the Excel sheet (https://github.com/ostaquet/Arduino-MQ131-driver/blob/master/extras/datasheet/Sensitivity_curves.xlsx).
I believe that lailomah is talking about this board:
Which can be understood by this circuit diagram:
Where the R2 is 1KOhm.
Best Regards,
Jose Damico
Thankyou for an organized tutorial about MQ-131 I have few questions if someone could answer it will be so helpful.
1: Instead of using all 6 pins of heater and sensors Can we use this Sensor with the module that has 4 pins (VCC,GND, A0. D0) ?
2: How the library is calculating PPM? is it converting the analogue values into ppm?