Newsgroups: comp.robotics
Path: brunix!sgiblab!swrinde!cs.utexas.edu!uunet!decwrl!decwrl!csus.edu!netcom.com!nagle
From: nagle@netcom.com (John Nagle)
Subject: Re: Polaroid(tm) Sensor Update
Message-ID: <nagleCD0pGE.942@netcom.com>
Organization: NETCOM On-line Communication Services (408 241-9760 guest)
References: <1993Sep7.164326.23820@merlin.dev.cdx.mot.com> <26itga$sum@unix1.cc.uop.edu>
Date: Wed, 8 Sep 1993 04:21:50 GMT
Lines: 11

hughes@napa.uop.edu (Ken Hughes) writes:
>On this last note; has anyone using the ranging module been able to get
>the blanking to work?  I tried driving the signal as per the documentation
>in order to detect objects closer than 1.5 feet but couldn't get it to work.
    
      Don't expect much; you have to allow some time for the transducer to
stop ringing.  If you want range down to 0, you need separate transmit
and receive transducers.  Most industrial robots with ultrasonic sensors
use two transducers; otherwise, a blocked sensor looks like open space.

					John Nagle
