----- Original Message -----
From: "Dr. Chris Kirtley" <kirtley@CUA.EDU>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Saturday, October 21, 2000 2:37 AM
Subject: [OT]: Inductive coupling


> Dear all,
>
> I still didn't get any replies about inductive coupling. Forget the bit
> about battery charging, if you like :-) - perhaps if I phrase it
> differently - how would you transmit an on-off switch signal a few feet
> without using RF? (no infra-red etc. please!).

I've lost track of the thread here, was this to detect if you're in range of
the base unit?

I don't know if you can get transducers small enough for your application,
but ultrasonic might be worth investigating.

Or for no battery power drain, bar-code the shoe and use a surplus POS
scanner.




.

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