Thanks one and all.
I always search DK first- musta overlooked it.
This outta do it
http://rocky.digikey.com/WebLib/Motorol ... SERIES.pdf
Next is to interface it to a PIC ADC I guess.
The idea is to control a 120VAC compressor motor with a pic
And hense the airflow to the device.
It would be a simple matter with a triac.
But a stepper motor connected to the pot shaft is a little too Rube Goldberg.
Any ideas ?
Oh, one other thing. I found an old blood pressure monitor in the junkbox. It has a pressure transducer in it and appears conected to a 74HC02, Quad 2-input NOR gate. Only 2 connections to it and there is no change in voltage ref to gnd or across the pins as the cuff pumps up. And it works. Strange.