Subject:
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Re: Navigation using landmarks (Was: Re: lasers and RCX)
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Newsgroups:
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lugnet.robotics
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Date:
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Wed, 10 Jul 2002 07:13:05 GMT
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Original-From:
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Steve Baker <sjbaker1@airmail.ANTISPAMnet>
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Reply-To:
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SJBAKER1@stopspamAIRMAIL.NET
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Viewed:
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1038 times
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John Barnes wrote:
> I was hoping, since the thread was already onto how to modify and mount the
> mouse guts, that it would have been preceeded by a successful attempt to
> interface the little beast. Since I already know quite a lot about how
> tedious it is to get data into and out of the RCX, I was becoming
> increasingly intrigued by how that might have been done. Guess I'm going to
> have to wait some more, or else have a bit of a go myself ;)
I don't think anyone has actually *tried* this yet - but it's still worth discussing
the *other* issues since we wouldn't want to go to the hassle of ripping apart mice
until it's evident that it *could* work.
The data stream from the mouse is basic serial port stuff at 1200 baud. One
way to interface to that would be to wire it into one of the input pins on the
RCX's CPU and decode the serial protocol in software. That ought to work OK
in LegOS or something - but there isn't enough performance to do it in NQC or
whatever.
Another approach is to hijack the IR input's serial port - changing the baud
rate to 1200 and either generating an IR signal from the mouse chip or again
hacking into the RCX and wiring it up directly.
There are obviously ways to do this - whether these are *good* ways or not
remains to be seen.
> I'm a laptop user at home and a trackball user here at work so my experience
> with rodentia is somewhat limited :)
Trackballs are just upside-down mice - the interface is identical.
----------------------------- Steve Baker -------------------------------
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