I have a bathroom in which every once in a while there is a smell of sewer gas, which I cannot pinpoint the origin of. I am thinking of installing some sort of device which will monitor for it and turn on fan when it is detected. Supposedly, I need to monitor for H₂S and CH₄ concentration. Does anybody have any recommendations what could be used for that purpose? Generic air monitoring devices such as AirGradient or AirThings do not monitor for these specific gases. I wonder if I could conjure something using ESP32 board and some detector? Throw ideas at me please
You could try with general VOC sensor. If that doesn’t work Dfrobot has inexpensive gas sensor modules:
SEN0565_Fermion_MEMS_CH4_Sensor_breakout
SEN0568_Fermion_MEMS_H2S_Sensor_breakout
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