[werk_ag]

FineOffset wind direction and speed sensors are cheap and easy to replace but not particularly accurate. Particularly the one that points the wind direction is known to be very "jumpy" (perhaps because it's too light) while simultaneously not picking the fine intermediate cardinal points as often as it would be statistically expected (meaning for instance than in the N-E quadrant it tends to accumulate readings in N - NE - E while NNE and ENE almost ever show up). There's a detailed study about this somewhere, I believe in SandaySoft forum, but it only takes a look at a daily windrose of readings to notice it.

This is a know issue with Fine Offset weather stations. The WeatherDuino Pro 2 does not solve this issue but you can greatly improve this behavior, with a very careful adjustment of R8 on the TX unit. Normally adjusting R8 to 10K will work, but you can do better... before install the wind vane in it's definitive place, connect it to your TX unit, manually rotate it and check that all cardinal points are detected. Then slightly adjust R8 in a way that the readings from the vane don't change from one positions to another with just a very small movement. This procedure also reduces the bouncing with low wind speeds.

My question then is: where to find a suitable replacement?

There is of course the Davis 6410, which I believe (correct me if I am wrong) can fit the WeatherDuino TX unit phone like jack without any modifications. It's nevertheless somewhat expensive (117 euros + 10 euros postage in the the linked offer) and according to a post somewhere in this forum not as durable as one would expect.

Does this leave us without options?

Currently the system does not support the Davis wind measuring instruments.
The mode of operation of the Davis wind direction sensor, though based on the same principle, is different from the Fine Offset sensors.
It is possible that at some point, I will add support for them. Is not technically very difficult, the major problem is that I don't have any of those instruments to test.

If support for other wind sensors were solely dependent on my will, it already existed, but ... good quality wind sensors, are few, and are expensive. I have already contacted with some manufacturers, for units to test, but even with their goodwill and some discounts, prices go beyond my means.

Anyway, I don't give up easily, in future I really want to add support, at least for some kind, of high quality wind instruments (speed and direction).