Subject:
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Re: Help!! Polaroid problem!!!
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Wed, 22 Apr 1998 07:32:30 GMT
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Original-From:
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Thomas Hauri <HAR@ihatespamTWI.CH>
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Viewed:
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750 times
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well....I might be the way you are powering the sensors ???
Maybe luck ????
:))))))
Actually I don't why you don't need any of those supporting parts.
A short question ...For what range are you using the sensors (are you using the
binh signal) ??
We never had any problems using the sensors with a range above 40 cm. But as soon
as we tried to measure down
to 15 cm (using binh) we had false echo signals.
One strange thing to this story...about 15 month ago, when I first built an
interface to those sensors they worked just fine. Then suddenly after rebuilding
the interface (using bigger caps and a interfaceboard instead of a breadboard)
they didn't work anymore....I don't know anymore wether I also changed the
sensorboards or not.
So I ended up with the problem not to be able to use the sensors with binh.
After adding the caps as discribed in an earlier mail they just worked fine.
So if anyone can track those problems down to one cause please let mie know....
Thanks
Tom
> Why does it seem like everyone except me needs a pullup resistor and
> perhaps a capacitor somewhere to operate the Polaroid? I've never had any
> problems without any of these components. ???
>
> The first time I connected the sensor, it worked perfectly.
> Maybe I my Handy Board happens to have better components? :-/
>
> -----------
> ericson mar
> Master of Engineering Candidate
> Project: Mobile Robotics
> mar@cooper.edu
> (212)353-4356
>
> Department of Mechanical Engineering
> The Cooper Union for the Advancement of Science and Art
> -------------------------------------------------------
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Message has 1 Reply:
 | | Re: Help!! Polaroid problem!!!
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| When it first worked for me, I used the HB NiCd. I grounded binh and it worked. I used binh to measure like 7 inches and it worked fine too. ---...--- ericson mar Master of Engineering Candidate Project: Mobile Robotics mar@cooper.edu (212)353-4356 (...) (27 years ago, 22-Apr-98, to lugnet.robotics.handyboard)
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Message is in Reply To:
| | Re: Help!! Polaroid problem!!!
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| Why does it seem like everyone except me needs a pullup resistor and perhaps a capacitor somewhere to operate the Polaroid? I've never had any problems without any of these components. ??? The first time I connected the sensor, it worked perfectly. (...) (27 years ago, 22-Apr-98, to lugnet.robotics.handyboard)
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