Subject:
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RE: Polaroid sonar problems
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Tue, 2 Mar 1999 01:18:26 GMT
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Original-From:
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Ted Mylenbusch <amylen@worldnet.att=SayNoToSpam=.net>
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Viewed:
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3226 times
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I also found that my neon light in my magnifying lens lamp caused erroneous
readings. When I turned it off or moved it away the readings normalized
(gave the correct results). Shielding wasn't effective in this instance.
I did completely away with the ribbon cable supplied with the sonar kit. I
installed 9-pin D connectors at each end and ran shielded 4 pair cable
between the HB and the sonar board.
I provided a separate power supply for the sonar system (4 - 1.2 volt
cadmium) and located it close to the actual sonar. Thus eliminating the
high current pulse and resultant magnetic field through the 4 pair cable.
Hope this helps.
Ted Mylenbusch
amylen@worldnet.att.net
> -----Original Message-----
> From: Guy & Gad Berg [mailto:gberg@netvision.net.il]
> Sent: Monday, March 01, 1999 4:16 AM
> To: handyboard@media.mit.edu
> Subject: Polaroid sonar problems
>
>
> hi!
>
> Our group is still struggling with the polaroid sonar. We can't get any
> coherent reading, only readings that are in the range 470-515, which
> aren't effected by the measured distance.
> We have the capacitor and resistor installed as required.
> We tried using a 150ms delay (instead of 50) and we average our
> readings, we tried taking every tenth reading and displaying it, but
> nothing seems to work.
> We know there are people out there who have succeeded! PLEASE, tell us
> what you did.
> Thanks.
> Guy.
>
>
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Message is in Reply To:
 | | Polaroid sonar problems
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| hi! Our group is still struggling with the polaroid sonar. We can't get any coherent reading, only readings that are in the range 470-515, which aren't effected by the measured distance. We have the capacitor and resistor installed as required. We (...) (28 years ago, 1-Mar-99, to lugnet.robotics.handyboard)
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