Sat Feb 22 17:51:59 CET 2014

Simple load-modulated communication

Single bus, multiple senders using load modulation.  Can use any kind
of RF modulation technique to share bus.  Reception is tricky, but for
unidirectional sensor nodes it might not be a problem.

It's probably simpler to just use 1-Wire:

3 or 5 V, 5k (1k long distance - 300m)