On Mon, Nov 23, 2015 at 09:22:03AM +0200, embedded systems wrote:
> Only if will be able to collect just the 50/60Hz hum and our
> microcontrollers will run for free.

Thing is, the typical hum isn't free.  Collecting it, even with an earth
loop, consumes power.

Perhaps what you are really after is collecting it before it is
metered.

Not equitable, and not scalable.  ;-)

(I've a 22 kV 50 Hz transmission line through my farm.  It is 7 m above
ground with two conductors separated by 2 m, and 750 m in length.  My
house is the only load.  So I guess any loss due to cattle fenching in
parallel should be proportional to house load?)

--=20
James Cameron
http://quozl.linux.org.au/
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