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 20:35:13 GMT
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Original-From:
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Martin <martin@+StopSpam+mediax.com>
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Reply-To:
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martin@mediax^spamcake^.com
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Viewed:
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630 times
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John Barnes wrote:
> That reminds me. A while ago now, someone here suggested trying
> out the guts of one of those ball-less optical mice as the basis for
> a sensor to watch the floor go by under the robot. Did that get
> anywhere? Does anyone even know how those things work? Are
> they still $50?
Those cameras have a small, low-resolution CCD in them, and they take
snapshots of the mousing surface and compare them to detect the quantity
of motion.
If you were going to use one of those mice your best bet would be to put
together a sensor interface using a PIC chip to simply interface with
PS/2. Then you could also get some touch sensors out of it (IE, the
mouse buttons.) But the electronics on the inside are unlikely to give
you pulses back out, except in the form of serial port data (IE, PS/2,
which is more or less an RS-232 port at 5 volts rather than +12/-12.)
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Message has 2 Replies:
 | | Re: Another DIY sensor
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| (...) All optical mice use the HDNS-2000 (short: HD 2000) chip from Agilent Technologies. There are two output modes: the rs232 output and the quadrature output mode. The quadrature output gives the Delta X and Delta Y values (how much the x,y (...) (24 years ago, 17-Nov-00, to lugnet.robotics)
| | | Re: Another DIY sensor
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| (...) Oh, and I forgot to mention, you won't get rotation out of a PS/2 interface. It does (primarily) +x, +y, and however many button events. (24 years ago, 19-Nov-00, to lugnet.robotics)
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Message is in Reply To:
| | Re: Another DIY sensor
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| Umm. (...) No I didn't! My laptop has a glide point thingy so I don't have box full of dead mice! . But I should investigate! Thanks for the idea. (...) That reminds me. A while ago now, someone here suggested trying out the guts of one of those (...) (24 years ago, 16-Nov-00, to lugnet.robotics)
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