Electronic Altimeter This circuit was
designed by Matthias Stehr (http://home.t-online.de/home/Matthias.Stehr/projecte.htm).
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 |
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calibration |
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saving and displaying the reference
pressure |
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calculating and displaying of
the relative altitude (resolution 7m) |
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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 |
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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 |
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PIC
Source in C (PCM
PIC C Compiler by CCS) |
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illustration program source
in Borland Builder 4.0 C++ |
![altimiter.gif (42800 bytes)](altimeter_small.gif)
Click the above thumbnail to view the schematic
![illustrate.gif (28552 bytes)](illustrate_small.gif)
Click the above to see a sample output from the Illustration
Program
Disclaimer
How to save and view
schematics
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