Subject:
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Re: Another DIY sensor
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 16 Nov 2000 19:25:15 GMT
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Original-From:
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Stephen J Baker <sjbaker@link#nospam#.com>
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Reply-To:
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(sjbaker@)avoidspam(link.com)
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Viewed:
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863 times
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> So I decided to investigate DIY
> rotation sensors. The first two or three simply didn't work. Then
> I hit upon the magic recipe;
>
> I made a slotted disk using overhead transparency material in the
> laser printer. A simpe disk with 25 black segments.
>
> Then I found that digikey sell an Omron dual optical interrupter
> module.
Did you consider buying a $5 computer mouse and gutting it?
That will give you not one but TWO slotted disks and TWO
dual optical detectors. It's hard to imagine another
solution for $2.50 per sensor!
IIRC, most cheap mice are ~200 clicks per inch - but there is
considerable 'gearing'. The difference between the diameter
of the mouse ball and the cylinder it rolls against is large
- so I guess the shaft encoder has got to be worse than 200
counts per revolution - or even the 100 counts per rev that you
are getting.
I've never tried this...someone should!
What would be really cool would be to find a way to get the
RCX to read RS-232 - then you could just duct-tape the whole
mouse underneath your robot!
The baud rate on a mouse is probably pretty low - I wonder
if you could read the serial data stream in software?
----
Steve Baker (817)619-2657 (Vox/Vox-Mail)
L3Com/Link Simulation & Training (817)619-2466 (Fax)
Work: sjbaker@link.com http://www.link.com
Home: sjbaker1@airmail.net http://web2.airmail.net/sjbaker1
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