TT043: Maha Air Quality Sensor

Measures CO2, O2, and airflow.  Uses a TipTop1590G base with ToprCO2 and ToprO2Flow.

12V power.

First prototype used Rev00 TipTop1590G, which requires an ECO to bring out a second serial port.  Here's the marked-up schematic:

Any future protos will use Rev01, which doesn't need the ECO.

ToprCO2 is a simple transition board for the T6613 CO2 meter:

ToprO2Flow is another simple board, with the LOX-O2 meter and the Posifa PAV1015 flow meter:

Top view:  The USB connector should face down for the flow meter to register a rising air current.

Arduino code: