April 2011
Intermediate to advanced
312 pages
9h 32m
English
Content preview from Interfacing PIC Microcontrollers
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exposed to atmosphere, while the pressurised system is connected to the other
side. Small deviations from atmosphere caused by meteorological variation are
more difficult to measure accurately.
It is suggested here that one side of the gauge is connected to a closed tube rep-
resenting 1 atmosphere, while the other is exposed to the varying meteorologi-
cal pressure. Careful calibration will be required, with temperature compensation
for its effect on the fixed volume of air. This temperature measurement is avail-
able from sensor input described above.
Low-cost pressure sensors use a strain gauge bridge made up of laser-
trimmed piezo-resistive elements ...