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Subject: Re: to know about sensor for detect obstacles like wall

Date: 09/13/01 at 1:19 AM
Posted by: Dennis Gibson
E-mail: dennis.gibson@anu.edu.au
Message Posted:

In Reply to: to know about sensor for detect obstacles like wall posted by azman yaakub on 08/26/01 at 12:26 PM:

Probably the easiest would be ultrasonics.
Most electronics suppliers stock 40kHz
transmitters and receivers cheap. You can detect
close objects by "pinging" the transmitter and
looking for reflections followed a short time
later. Sound travels at about 300m/s so you
should be looking about a milli second later for
about a foot return distance. Similar technology
is used in ultrasonic measuring tapes.

Good luck,

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