Dear Don,

Thanks for your patience!

size limitations - that's the most important. It has to fit in a shoe,
so I'm aiming for about an inch square or so and very thin - about 3-4
mm. It has to fit inside an insole. My circuit (PIC, EEPROM, telemetry
transmitter) fits this criteria at the moment, but as I say I am using a
switch to tell it when it is within range. I'd like this to be
automatic.

cost - < $100

limitations - it has to be inside the shoe - well, I'm starting to think
about mounting it under the instep, which might permit infra-red

approvals required - let's not worry about that for the moment :-)

hobby or commercial - well, university research - somewhere in between

power available at each side - plenty at the receiver (it's a PC - the
reciver - a Linx LC - goes into the RS232), about 10 mA max at the
transmitter

reliability requirements - I'm flexible at the moment, but clearly this
would have to be good in the long run

Note that I am not trying to send the data this way - I already have a
conventional RF transmitter. I just need something to tell it that it's
in range of the receiver.

So, are you saying that an RFID tag wouldn't cover much distance?

Chris
--
Dr. Chris Kirtley MD PhD
Associate Professor
HomeCare Technologies for the 21st Century (Whitaker Foundation)
NIDRR Rehabilitation Engineering Research Center on TeleRehabilitation
Dept. of Biomedical Engineering, Pangborn 105B
Catholic University of America
620 Michigan Ave NE
Washington, DC 20064
Tel. 202-319-6247,  fax 202-319-4287
Email: kirtley@cua.edu
http://engineering.cua.edu/biomedical

Clinical Gait Analysis: http://guardian.curtin.edu.au/cga
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