Subject:
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Re: Ball-less mice (was :Re: FW: Another DIY sensor)
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 30 Nov 2000 14:57:34 GMT
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Viewed:
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1016 times
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Oh. I sort of figured that you took the stuff out of the mouse (i just went
back and read all the messages ;), it just that I have an optical mouse and i
wouldn't want to take it apart. if the rcx could read the outputs from the
mouse directly, then you wouldn't have to take hte mouse apart. All you would
have to do is hook up a ps/2 or usb connector to a lego connetor brick (what
ever they are called). Then when you wanted to use the mouse with the rcx, all
you would have to do is plug it in to the previce device and plug that into the
rcx. When you where done, you could plug the mouse back into your computer.
That way you could use the mouse as both a mouse and as a rcx sensor!
Jason
John Barnes wrote:
> Jason wrote:
>
> > Doing a little research, I found out that, when
> > used with ps/2, mice are supplied 5 volts dc and have two data outputs, • for a total
> > of 4 wires. I'm not sure how much power the rcx supplies, but optical • mice should
> > be able to work with the rcx. The only problem is getting the rcx to • understand the
> > inputs and what to do with them...
>
> I was the one doing the experiment. But my investigation is not to use the
> mouse as
> is, but to use the parts, which I have done. There are two optical shaft
> encouders per
> mouse in the ball type. Each one can be built into a brick* with an LM393
> to square
> up the A and B channels to give outputs that the RCX can use, just as if it
> were reading
> from a Lego rotation sensor. I get 144 counts per rev, which is quite an
> improvement
> on 16 if you need increased precision. (You do have to be careful you don't
> turn it too
> fast otherwise the firmware skips/misses counts.)
>
> (*The "brick" in my case is 2x4 x3 high, slightly taller than the Lego
> rotation sensor
> but not bad.)
>
> I haven't managed to get my hands on one of those ball-less ones yet, but
> someone
> posted the url for the Agilent data sheet for the key part and I note that
> it can run in
> quadrature mode, which means that it too can probably be interfaced
> directly with
> the RCX. If and when I get to try it, I'll let you know.
>
> JB
>
> ps: I am teaching myself "front page". When I get a bit better at it, I
> plan on making
> some of the sensor designs I have been working on more accessible via my
> web page.
> www.borg.com/~pinkmice. Of course, that means I'll need a digital camera to
> take all
> the pictures with, and with Christmas coming .. umm there's a plan.
>
> So please be patient.
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Message is in Reply To:
 | | Re: Ball-less mice (was :Re: FW: Another DIY sensor)
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| Jason wrote: >Doing a little research, I found out that, when >used with ps/2, mice are supplied 5 volts dc and have two data outputs, for a total >of 4 wires. I'm not sure how much power the rcx supplies, but optical mice should >be able to work (...) (24 years ago, 30-Nov-00, to lugnet.robotics)
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