Changing 5V to 3.3V on the mq131.cpp readRS()function about arduino-mq131-driver

[ostaquet]

Hi @alf-esp32,

Thanks for the feedback on the 1.5.0. I merge the pull request without checking in details... It is my fault and it is now fixed in 1.5.1.

There are two power lines to the MQ131 sensor. The heater circuit needs 5V to be sure that you're burning the gas particle and have the right chemical reaction. The sensor circuit could be powered by a 3.3V line (instead of the 5V line) as the sensor is acting as a resistor that vary depending on the gas concentration. So, by changing the 5V into 3.3V should work ;-)

[Olvera-Orozco-Miguel-Angel]

Hello,

I tested the code you shared with Arduino (I mean this https://github.com/ostaquet/Arduino-MQ131-driver) , and it works perfectly. However, I need to use an ESP32 now, and I'm not sure how to connect the MQ131 sensor to the ESP32. Could you please provide some guidance?

Thank you!