Andy Burns wrote:
Graham. wrote:

wrote:

Just came across the MK Echo wireless switch system.

Interesting that the transmitter works without batteries by
"harvesting energy". I wouldn't have expected it to work.

This is the underlying technology ...

http://www.enocean-alliance.org/en/enocean_technology/


And here is where it was invented

http://vps.templar.co.uk/Cartoons%20...7322.strip.gif