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I have heard Mark van Steen talk about something similar but wireless. A bit more tricky but much more interesting. Devices sleeping most of the time waking up once per minute to send and receive. The programming gets really tricky I guess

Yes, siphoning bit of ambient radiation until a capacitor is full enough to fire off a single packet.

Finally you'll never lose your keys again.

This is RFID on steroids.

edit: Don't you mean Maarten van Steen ?

Linky please?

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