Of all the ingredients making up a
local weather forecast, perhaps the
most important is knowing what the
current atmospheric pressure is
doing. "Highs" and "lows" and
especially rapid changes between
those extremes typically give a very
good indication of what's in store.
The barometer — a device dating
back to the time of Galileo — is used
to measure atmospheric pressure.
Until quite recently, barometers were
mechanical in nature, built of
siphons, glass cylinders or rubber
bulbs filled with water, mercury, or
air. Nowadays, we have electronic
equivalents which are not only easier
to use and more accurate, but also
less expensive. Best of all, a solid-state barometric pressure sensor can
be interfaced to a microcontroller for
automated data logging and analysis
of trends.
By Thomas Henry
48 August 2015
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