For a complete list of all the Air Quality Sensors test on the World Air Quality Index project, check our sensor overview page.
This experiment is based on a modified Shinyei sensor, where the analog readings is taken before the schmidt trigger which converts the analog signal into the 0/1 LPO.
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.
Note that TP7 is just used for refence and hardware debugging, and not used in this experiment.
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