On Mon, 18 Feb 2002, David P. Harris wrote:

> There's a great one on the web--  consists of a 555 timer with an antennae
> feeding a PIC (So I can change the header!). The PIC calibrates to teh freqy
> when you turn it on, then reports changes in the freqy.  I have a bookmark
> somewhere...if anyone wants it.

I saw one like that on the PARTS web site (Portland Area robotics club), I
think.  Someone had adapted one for use as a proximity detector for
robots, very cool.

http://www.rdrop.com/users/marvin/other/otherprj.htm

Dale

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