Check out the followin for IR, capacitive, and sonar ranging applications:
http://www.nwlink.com/~kevinro/guide/infrared.html
http://www.hamjudo.com/sonar/
http://incolor.inetnebr.com/bill_r/polaroid%20sonar%20mod.htm
http://www.rdrop.com/users/marvin/parts/issue14.pdf

SO.....Whaddya REALLY  want??

Carl R, McIver  (usually)
or the wife (Janet) and kids

Pull your head out to send me e-mail!
jncmcivryourhead@gte.net

-----Original Message-----
From: Justin Grimm <reaper@SOUTHWEST.COM.AU>
To: PICLIST@MITVMA.MIT.EDU <PICLIST@MITVMA.MIT.EDU>
Date: Thursday, May 14, 1998 8:29 AM
Subject: [OT] InfraRed Sensors


> Hi all
> Im in the process of building a walking robot and I want to
> use infra red emmiters and sensors to detect the distances to objects.
> Does anyone have any circuit diagrams for this application,
> or information on how this principal works?
>
> Thanks in advance
> Justin Grimm
> reaper@southwest.com.au