Subject:
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Re: Beginner's questions...
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Wed, 10 Feb 1999 18:20:25 GMT
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Original-From:
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William Bain <willbain@cs.*nomorespam*umt.edu>
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Viewed:
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904 times
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On Tue, 9 Feb 1999, Robert J. Kelly wrote:
> How do I use the matched pairs of infared interrupter switches as a means of
> controlling speed of both wheels?
You'll need slotted disks mounted on the axles positioned between the
emitter and the detector. I recommend using ones from a dead computer
mouse.
> As it is now, it appears that all the
> power goes through one motor and the "leavin's" go to the other motor. I can
> understand some inherent differences in two different motors, but I have to
> set the "fast" one at about half power to match the speed of the "slow" one
> at full power.
You ought to check for wiring problems and excessive friction in the gears
and axles. That seems like a huge difference in power settings. Try
different pairs of motor ports, too.
> Also, are there infared detectors available cheaply (as in a couple bucks)
> that will detect objects at least a few inches away rather than the very
> short distances provided by the Quality Tech QRB1114?
I heard of such things, but don't have specifics. Sorry.
> By the way, I've tried this and though the
> LED is working, the detector I'm using (detector part of a pair of RS part #
> 276-142) doesn't seem to detect anything (out of the light spectrum
> possibly?).
It could be the wrong wavelength of IR, but more likely is that the
detector is expecting modulated IR (pulsed at maybe 40kHz or so to avoid
being affected by ambient radiation--e.g. sunlight). Best of luck to you.
--Will
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Message is in Reply To:
 | | Beginner's questions...
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| Hello again all, Well, I've got an HB, HB Expansion board, geared motors (motors from Gleason, gears from HVW, "mashed" to fit), some good batteries and a downloader. I've also got sensors such as QRB1114 infared detectors, some General Electric (...) (26 years ago, 10-Feb-99, to lugnet.robotics.handyboard)
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