[engolling]

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.

In principle it is no problem to develop a low power system based on a Atmel mcu like the Mega328, it also has sleep modes pushing the consumption down upto to a few µA.
But you will have to lower your thoughts…

- No nicely lighting LEDs consuming nearly as much power as the whole MCU.
- No voltage regulators - at least no linear ones - the MCU might be directly powered by a Li-Ion Battery (3-4,2V)
- No onboard UART to USB converter just a interface to connect it externally for flashing and debugging
- A reduced update rate that you will get a low duty cycle (you may miss a wind gust)

This might be interesting for some special applications but I think a weather station needs a fan and a heating (in the locations where temperatures can get below zero) making low power difficult .

Nevertheless if my stuff is all online and running properly I could imagine contributing to a low power TX board.

Regards,
engolling