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AN #14 - How to implement a flow meter using the 80552 |
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How to implement a flow meter using the 80552
The following application note was donated by Mike Crean
The program shows how to use the A/D converter of the 80552.
The sensor for this flow meter was made from a turbine (fan) with
2 * magnets mounted on it seperated by 180deg's opposite polarity's
out.
A Hall sensor that switches on with one polarity and of with the other
was mounted on the out side of a pice of polly pipe.
This signal is then fed to a 4018 chip running in / by 10 mode, it's output is sent to
P4.0 as the input signal for the 80C552.
If this setup was to be used in another application it would be wise to
use / switches on the 4018 to allow for more calibration.
This code is far from complete or bug free, but it might be usefull to you.
Ps. The flow rate is output on the LCD or to a terminal when requested.
Four buttons allow you to scroll menu's on the LCD
Download source code in .BAS
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