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In lugnet.robotics.handyboard, Richard Giuly writes:
> I just hooked up a polaroid sonar module with the suggested capacitor, and it
> does work for the most part. Unfortunately about every 5th value (using the
> display_sonar function) is markedly different that the others, half the reading
> or so. Is this expected behavior or is there something I can do to fix it?
In my experiments I have found that in using the Polaroid boards you have to be
very careful of ground loops and making sure you give adequate time for the
board to reset and that cap on the power line to recharge. I used to get a
weird value exactly every third pulse sent out - I traced it to a ground loop in
my power circuit. Make sure all of your grounds come together in the same place
and that you don't have multiple ground locations coming from your controller
board. This is what happened to me. It also showed up as a limitation in my
max range because my ground seemed to "float" up. I could only ping out about
31 inches. After I cleaned up my ground circuits my ranges started coming in
plus or minus 1 inch and went out to 15+ feet.
DLC
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Message is in Reply To:
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| I just hooked up a polaroid sonar module with the suggested capacitor, and it does work for the most part. Unfortunately about every 5th value (using the display_sonar function) is markedly different that the others, half the reading or so. Is this (...) (24 years ago, 12-Nov-00, to lugnet.robotics.handyboard)
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