On Thursday, February 9, 2017 at 9:21:16 AM UTC-8, wrote:
Speaking of technology I just watched a seminar by Infineon - they make sensors. In the pressure transducer they make for exercise trackers can have high definition to tell that someone is climbing or descending stairs or help determine what kind of activity they are doing.
They can sense a air pressure difference of 50mm/2 inches!!!

These were energy efficient for use with battery powered systems of course.

Chris

I remember being told that the sensors used in the LXNAV equipment measure 1cm or altitude 100 time per second.

Richard
www.craggyaero.com