[uncle_bob]

You already used this "Stevenson Screen" with your previous weather station, or it was "developed" now for the WeatherDuino Pro2?

It was used on the old WS3081 as well. Though I had to change the mounting for the sensor mast as the gutter wasn't on the roof previously.

Are you using WeatherDuino Pro2 to control the fan? I suppose so.
Surely you noticed that in the TX unit software, you can change the on / off parameters for the fan. Perhaps you have to change default values, they ​​may not be appropriate for your location / instalation.
I believe default outside temperature value for turning the fan on, may be too high.

I saw the settings in the TX firmware for the fan, but I'm currently just running the fan off the output of the 7809 regulator. Really the only times I'd need the fan not running is when the sun isn't shinning. Maybe there's an idea for the now unused solar sensor off the WS3081

Anyway the "Stevenson Screen" seems to work fairly well as now my station appears to follow the other stations in my area quite well.

http://www.wunderground.com/personal-wea...D4#history

[werk_ag]

I saw the settings in the TX firmware for the fan, but I'm currently just running the fan off the output of the 7809 regulator. Really the only times I'd need the fan not running is when the sun isn't shinning. Maybe there's an idea for the now unused solar sensor off the WS3081

I saw you were using a big fan, that's why I asked that question.
Although the MOSFET transistor used to switch the fan on or off, support high currents, the 7809 regulator is limited to 1A.
When a fan is connected to the system, a heatsink in the 7809 is required.

The system has been designed to use fans with consumption of around 200mA, if the current draw of your fan (at 9V) is less than 200mA, it is safe to control it with WeatherDuino, but put in use your unused solar sensor, it's also a creative job.

Anyway the "Stevenson Screen" seems to work fairly well as now my station appears to follow the other stations in my area quite well.

http://www.wunderground.com/personal-wea...D4#history

Not bad I think. And other data are also similar to those of nearby weather stations.

[werk_ag]

Just a note, about why I have choose to power the fan with 9 Volt from the 7809 regulator, and not directly from the 12V power connector. Just a easy way to lower the fan speed and reduce noise. Small fans, like the one I use in my home made radiation shield (with white plastic dishes), tends to be noisy.

[uncle_bob]

Just a easy way to lower the fan speed and reduce noise. Small fans, like the one I use in my home made radiation shield (with white plastic dishes), tends to be noisy.

Before having to run 12vdc to the TX unit, I used to power the fan via 5vdc. It's a little nosier now at 9vdc, though easily bearable.

[uncle_bob]

Bit of a quick update.

We've had a good drop of rain today along with some wind and I must say the WeatherDuino is running superbly!

I'm more than happy with this weather station
Thanks Werk_AG and the secret alpha and beta testers!

[werk_ag]

I'm glad the WeatherDuino Pro2 meet your expectations.
The start of the meteorological day at 9am also seems to work well. I've been watching on your page...

Thanks Werk_AG and the secret alpha and beta testers!

Not so secret ... only discrete!

[uncle_bob]

RX v3 PCB is assembled and working
Note that I'm having to use an external 5V power supply reg (7805 on the stripboard). Normal users powering the unit via USB wouldn't need to do this.



Still no temp sensor yet.



Another view



Underside view

[werk_ag]

Nice job, uncle_bob!

Don't forget jumper between pin 2 and 3 on JP1.

[uncle_bob]

Just as a matter of interest, here's an updated, beefed up, modded sensor mast. Please excuse my stick welding

[uncle_bob]

I've now received and installed the SHT10 in the TX unit.
It took over a month for that to arrive from China. *Mental note to oneself* Do not buy from Dealsmachine again :/