Subject:
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Polaroid trouble again
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Mon, 3 Aug 1998 14:11:45 GMT
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Original-From:
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Alf Kuchenbuch <alfk@eikon=spamless=.tum.de>
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Reply-To:
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alf.kuchenbuch@usa.SAYNOTOSPAMnet
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Viewed:
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632 times
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Hi!
I am having trouble with my Polaroid sonar:
When I keep my HB hooked up
to external power, I will only get correct readings up to 20 inches. As
soon as I use battery power without hooking it up to external power, the
readings are correct up to 6 feet, not more! This sound like EMI, I
guess. I tried all the capacitor tricks from HB mailing list, but in
vain. Do you know a fix that works?
Alf H. Kuchenbuch
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Message has 3 Replies:
 | | Re: Polaroid trouble again
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| I had this same problem when I got mine a few weeks ago. I ended up putting a capacitor from pin 1 to pin 3 on U2 of the sonar driver board. I also had to take out the 1k resistor from the BINH. It kept BINH at 1 V instead of Zero and that seamed (...) (26 years ago, 3-Aug-98, to lugnet.robotics.handyboard)
| | | Re: Polaroid trouble again
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| You may be trying to draw more current that your external battery can handle. The HB Nicd battery can supply alot of current, both surge abd continuous. This may be why it works in this case. If your external battery is not NiCd, it might cause a (...) (26 years ago, 3-Aug-98, to lugnet.robotics.handyboard)
| | | Re: Polaroid trouble again
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| (...) I haven't used the Polaroid module with my HB, but I have used them a lot with 68332 micro-processors. I does sound like you may have an electrical noise problem (not EMI, but noise conducted through the power bus). The only way I've got the (...) (26 years ago, 3-Aug-98, to lugnet.robotics.handyboard)
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