From the schematics below, the idea is to take the raw ouput of the diode directly after the first filter (TP6). However, since the frequency is still very high at TP6, which would require an high CPU DAC running at several hundreds of Mzh, we we getting the analog data from TP4.
Raw analog readings
Regular LPO readings
For the list of all air quality sensors, check the Sensor Overview page
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