Newsgroups: comp.robotics
Path: brunix!news.Brown.EDU!qt.cs.utexas.edu!cs.utexas.edu!uwm.edu!linac!att!bgsuvax!rlee
From: rlee@andy.bgsu.edu (Bob Lee)
Subject: Re: Mobile plataform simulation
Message-ID: <C2v1vI.Aoq@andy.bgsu.edu>
Keywords: robot navigation, path planning, map building, obstacle avoidance
Organization: Bowling Green State Univ.
References: <al281279.729971832@academ01>
Date: Mon, 22 Feb 1993 17:28:28 GMT
Lines: 22

In article <al281279.729971832@academ01> al281279@academ01.mty.itesm.mx (Joaquin Salas Rodriguez) writes:
>?WE are planning to build a programm to simulate de the transit of a mobile robot throught a know, closed and specular world. The robot is spected to have sonar sensors directed to planar surfaces composed by walls, corners and edges. 
>With this model we plan to study themes like path planning, obstacle avoidance and sonar obstacle detection. But before touch any key, woe would like to ask you if any one of you have built a model like the one described here. Any information will be ap
preciated.
>
>
>sincerely,   joaquin salas
>email :  jsalas@sigma.mty.itesm.mx
>

I'm currently building a mobile robot from an old Big Trak. I'm using an
IR emitter/detector pair as a proximity detector that will be read by a
6801 microcontroller. The emitter is pulsed at 30Hz and the detector is
fed into a bandpass filter and a schmitt trigger. The final output floats
at 0V and snaps up to 4V at 30Hz when an object gets near it. The active
bandpass filter takes care of filtering out all ambiant conditions,
including direct sunlight. The field of view is very narrow and the range
is about 6-12 inches depending on the type of material the signal is
bouncing off of.

-BOB

