Proximity sensor?

[Toby Paddock]

Passive infrared detector?  Like in one of those motion security lights.

Or from one of those plastic frogs that croak at you when you walk by.
Those really gave my kids the creeps.

 - -- -  Toby Paddock

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From: 	Andrew Schrock[SMTP:aschrock at cs.brandeis.edu]
Sent: 	Wednesday, September 29, 1999 2:53 PM
To: 	SynthFolk
Subject: 	Proximity sensor? 

Hi all, 

I am currently building a multimedia sculpture (video/sound). It is DIY
related, actually, since it will have primitive mixing facilities, parts
of a casio sk-5, parts of a speak&spell, and an analog filter. However, I
know how to do all that.. my question today is: what do you think is the
best way to implement a proximity sensor? I was thinking some sort of IR
switch, but I've always had a bit of trouble with those being reliable. I
need it to turn the sound on when somebody walks in front of it and go off
when they walk away. Seems fairly simple, but it has to be rock-solid. Oh,
did I mention cheap? :) 

Also, if anybody has one of those old Apple IIGS monitors, please let me
know. (the REALLY SMALL green kind which takes composite video input) I 
need one, and the week I decided to go through with this project somebody
bought the one I had my eye on at the salvation army. Bugger! 

later
Andrew

-| Andrew Schrock | aschrock at cs.brandeis.edu |-