[Adrian_Hudson]

Hello! This looks a great project.

I currently have a Davis VP2 but am disappointed with the quality of the sensors, especially the anemometer (although the latest revision of the anemometer is much better but still not great). My plan is to build the Weatherduino system over the next few months and eventually replace the Davis system.

Is there a list of sensors that are compatible with this project - I can see that it works with fine offset wind sensors but I wonder what else it is compatible with. I assume the anemometer is a momentary contact per revolution so that shouldn't be too difficult to replace with another make but an alternative wind direction sensor is likely to be different from the Fine Offset.

Thanks!

[werk_ag]

Theoretically the system can work with any anemometer that can output impulses. You just need to know the wind speed, corresponding to a revolution per second.
For instance, for Fine Offset anemometers, this value is 0.666 m / s (2.4 km / h).
Knowing this value you just need to change this line in the TX unit software:

// --- Wind ------------
#define WIND_FACTOR 0.666667

Relative to the wind direction sensor, it can be a little more difficult, but not impossible. Typically the output is an analog voltage, which is then read by an ADC.
Please refer to this doc to see how the system work with the Fine Offset wind vane.

After you have done a table with wind directions and corresponding ADC readings, on TX code, change values in vaneValues array according to your table (vaneDirections array is possible wind directions times 10).

// --- Vane -----------
const int vaneValues[] PROGMEM={66,84,92,127,184,244,287,406,461,600,631,702,786,827,889,946};
const int vaneDirections[] PROGMEM={1125,675,900,1575,1350,2025,1800,225,450,2475,2250,3375,0,2925,3150,2700};

Hope this info may help you.
Thank you for your interest in this project.

[Adrian_Hudson]

Thank you! That is very interesting.

Regards
Adrian

[werk_ag]

May I ask you, what wind speed sensor have you in mind?

Regards
Werk_AG

[Adrian_Hudson]

Ahh, sorry, nothing specific as yet. Professional anemometers are *expensive* but I just installed my fourth Davis anemometer - they just wear out. Perhaps I will use the Davis anemometer with Weatherduino initially and look to replace it with a better one when it wears out.

Do you have any of the circuit boards available to purchase and if so how do I go about that please?

[werk_ag]

Yes, I still have some RX and TX boards available. You have a PM.

[werk_ag]

Ahh, sorry, nothing specific as yet. Professional anemometers are *expensive* but I just installed my fourth Davis anemometer - they just wear out. Perhaps I will use the Davis anemometer with Weatherduino initially and look to replace it with a better one when it wears out.

Although WeatherDuino Pro2 system has been conceived to be built at low cost (and so will continue), I am considering the option of adding also support for measurement instruments of higher quality, especially anemometers and wind vanes.
I am already in contact with some manufacturers for specifications and prices, but certainly there will be many more that I do not know.

Do you have any information or list of such equipment that you could provide me links to the manufacturers websites?

Thanks