If you've got a 1-wire net (e.g. for measuring panel temps) you could
also see: http://www.btinternet.com/~jon00/electmon.shtml
I've bought a HobbyBoards 1-wire counter (http://www.hobby-boards.com/store/products/Dual-Counter.html)
for when I do my elec/gas meters though can't quite remember how I was
going to detect the red LED - a photodiode plus op-amp perhaps. Probably a
winter project (not specifying *which* winter of course!).
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