Am 19.10.2016 um 00:33 schrieb Peter Hollenbeck:
> I would like to count revolutions of an anemometer, perhaps this one:
> http://www.inspeed.com/anemometers/vortex_wind_sensor.asp
>
> I would appreciate suggestion on how to implement a counter.
>
You could use the DS2423, or some of the homebrewn DS2423 replacements
out there. As it has a reed switch, you need some debouncing on the input:
^ +5V
|
10kΩ
|
.-----+-------> DS2423 input
| |
o |
\ 100nF
\ |
o |
| |
=== === GND
These values give you ~1ms, which should be enough to debounce the
switch and which is fast enough for 500Hz (== 1250mph for this anemometer.)
Kind regards
Jan
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