> Got a new project to work on that requires a low cost air pressure
> sensor.  Expected pressure is quite low: 0 to 2" water column.

Does "air pressure sensor" mean is/isn't there or you need to measure
pressure in that range?

For the former (on/off) depending on your tradeoff between mechanical
and electrical costs you could use some form of bellows/diaphragm
arrangement and a microswitch or similar.

The truly Heath Robinson could also look at something similar with a
spring and pot depending on requisite resolution etc.

How many bits resolution do you need?
What is the order of maximum acceptable cost?



        Russell

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