[werk_ag]

According to the measurements I was able to make (with a voltmeter) the supply voltage supplied by the VP2 on the steering potentiometer is not constant: it is only present every 3s approximately. It cannot therefore be used to power the hall effect sensor.
This modification works in any case with a WearderDuino TX card which supplies 5V.
I wonder how they do at Davis with their new anemometers with hall effect sensor which seem to be compatible with the older.
So unfortunately I have to replace a reed switch because the anemometer that I am repairing is that of my Davis VP2.

Sometimes the KISS* concept of WeatherDuino reveal its advantages.
Not having been projected to be operated by small batteries, give us some facilities.
Indeed, the Davis ISS gives power to the sensors just for a very small period of time. Perhaps the hall effect sensor used doesn't work with the low voltage provided by Davis (not sure, but I think it is around 2.5 to 3V), other option may be trying to use a small supercap to keep the sensor always powered.


*KISS, an acronym for "keep it simple, stupid" or "keep it stupid simple", is a design principle noted by the U.S. Navy in 1960.[1][2] The KISS principle states that most systems work best if they are kept simple rather than made complicated; therefore, simplicity should be a key goal in design, and unnecessary complexity should be avoided.