Alt-BEAM Archive
Message #01142
To: "Beam List" beam@corp.sgi.com
From: John Leo Zimmer jlz@novia.net
Date: Mon, 01 Mar 1999 21:58:43 -0600
Subject: [alt-beam] Re: Edge Detector
I'm working on an edge sensor for a tracked version of my
push-me-pull-you. It involves a washer over the front axle just inboard
of the wheel. The hole is large enough that when it reaches the edge the
washer falls forward and down, dropping it out of the slot of a
led-photodiode pair and thus triggering a reverse of that track. (Using
the track adds stability since sticking the leading end over the edge of
the table won't lead to disaster until the center of gravity goes
over.)
alarm ____o o
off-->____|. . o
o . . o
o .*. o * axle The actual drive wheel would be
outboard
______________o___o____ of this
\
|
alarm ____ o o
on--> ____|o . . o
o .* . o
______________________o . . o
\o o
|
"Details at eleven" :-)
jlz
At 19:24 01 03 99 -0700, Jason De Jong wrote:
>>>>
... I am tring to get my bot to stop at the edge of a
table or other object before fall off. My current edge Detector is a
basically a regular sensor (the one found at
<<http://www.beckingham.com/>http://www.beckingham.com/)that
must be
touching the table for the bot to move. The problem is that for this to
work I need to lean the bot against the sensor which means when this bot
reaches an edge the bot still falls off the edge because it no longer has
that support. (Without making the bot lean on the sensor it tend to lift
of a suface and stop the bot in the middle of a table.)
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