[AllyCat]

Do you think in the future about some low low Tx unit for roof measurement ? (wind, mayby sun and UV) Low Low power I mean average consumption about 200uAmps, 3V.
Is it possible to connect some produced outside units directly to Rx via RF ?

Hi,

I believe that the main problem is that the "off the shelf" Arduino (Nano) is not at all designed for low power consumption. 

I have a long term aim to develop a much lower-power transmitter "compatible" with the Weatherduino receivers.  But this will need (or at least I plan to use) a different "micro-power" (PIC) controller which (AFAIK) is not compatible with the Arduino Development Environment.  Maybe not 200uA, but certainly less than 1 mA average, so compatible with power from a very small PV panel.

My first stage of the project will use the Auriol (duino) protocol (which is well documented) for Rain and/or Wind sensor(s).  Later, maybe add the protocol for Temperature and Humidity but unfortunately there does not appear to be a protocol for Solar UV and W/m2.  It might be possible to "invent" one, or the Solar support might have to wait for a later stage:

Ultimately, I would hope to support the "normal" Weatherduino protocol  (Radiohead)  but I am neither comfortable nor proficient with C(++) programming (yet). 

Cheers,  Alan.