This circuit was designed by Matthias
Stehr. The design uses a PIC16F877 to measure the output
of a temperature sensor and an absolute pressure
transducer to measure altitude. Specifically, the design
provides the following features:
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displays the current air-pressure
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displays the current temperature
-
calibration
-
saving and displaying the reference
pressure
-
calculating and displaying of the
relative altitude (resolution 7m)
-
saving of the altitude data in a 2k
EE-Prom in a interval from 1s-60s (result in a
recording time from 17min - max. 17h)
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can be powered by a 9V battery
(about 24h) or a 12V DC power supply unit
-
operation with 3 keys and LCD menu
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saved data can be transferred to a
PC with illustration and transfer handled by a C++
program
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data can be saved in a simple text
file
Click Here to View Schematic
Click Here to
View Output
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