Alt-BEAM Archive
Message #01295
To: BEAM LIST beam@corp.sgi.com
From: Chiu-Yuan Fang chiumanfu@home.com
Date: Thursday, March 04, 1999 9:29 PM
Subject: Re: capaciflector
>Actually. I've had that link in my bookmark file for aout a year now.
It's not
>new a new site, very old in fact. I've even tried to build one a while
back
>with absolutely no luck...maybe I was doing something wrong.
>
>Chiu
>
>Richard Caudle wrote:
>>
>> Hi,
>>
>> Sorry to say this, but I have been restricted from giving out any more
>> information about this sensor. My manager was on Chiu's site and saw
that I
>> shared the link. Deep CaCa! As soon as we get this stuff protected,
I'll
>> show you a sensor that'll knock your socks off! Until then, zippsky.
>>
>> Sorry again!
>>
>> Richard Caudle
>> richard@cqc.com
>> rwcaudle@hpamonon.com
>> Frankendaddy (ICQ#20105579)
>> _________________________
>>
>> "Guardians of The Sacred Words: Nee, Ptang, and Neewhon."
>>
>> -----Original Message-----
>> From: CBC
>> To: Richard Caudle
>> Date: Tuesday, March 02, 1999 8:14 AM
>> Subject: Re: capaciflector
>>
>> >Richard:
>> >
>> > Thanks again for all your thoughts. I'll go look for a few lm358s. I
also
>> >thought they would be good for obstacle avoidance for a robot. They'd
also
>> >be good for a long distance theremin if it's true they can detect from
many
>> >feet away.
>> > Good idea about using the driver cricuit as the sensor plate.
>> > I plan to use my Basic stamp (1) to read it. As I say I haven't had
much
>> >luck so far. I presume you use the pulsin command, but if you have any
>> >thoughts to the contrary let me know. I'm kind of shaky with this
stuff..
>> >
>> >
>> >
>> >Cheers and thank you VERY much for your help.
>> >
>> >
>> >MACQ
>> >
>> >'ll At 03:57 PM 3/1/99 -0500, you wrote:
>> >>I tried using 741's at first, but they never seemed to work right. Try
an
>> >>LM358 Dual Op Amp. That way you need only a single chip and four
>> resistors.
>> >>It's best to get a precision potentiometer to use in place of the 1M
>> >>resistors. I have been able to tune the sensor's frequency output up
to
>> >>over 250Khz.
>> >>
>> >>I have thought it would be a good circuit to use as a motor controller.
>> The
>> >>frequency output goes up as the sensor approaches an object. My
thought
>> was
>> >>that I could build in collision avoidance without using Nv's to do the
>> >>trick.
>> >>
>> >>It's also a good practice to use the actual driver circuit as the
sensor
>> >>plate. That way you cut down on spurious detections.
>> >>
>> >>Richard Caudle
>> >>richard@cqc.com
>> >>rwcaudle@hpamonon.com
>> >>Frankendaddy (ICQ#20105579)
>> >>_________________________
>> >>
>> >>"Guardians of The Sacred Words: Nee, Ptang, and Neewhon."
>> >>
>> >>-----Original Message-----
>> >>From: CBC
>> >>To: Richard Caudle
>> >>Date: Sunday, February 28, 1999 9:55 PM
>> >>Subject: Re: capaciflector
>> >>
>> >>
>> >>>Thanks Richard.
>> >>>
>> >>>I'd already found that site but wondered if you had a different
version.
>> It
>> >>>doesn't seem to work all that well for me (I'm using 741s) But the
>> >>>geometry clue is intriguing...
>> >>>
>> >>>thanks again.
>> >>>
>> >>>MAcQ
>> >>>
>> >>>
>> >>>
>> >>>The At 10:00 AM 2/28/99 -0500, you wrote:
>> >>>>Hello there,
>> >>>>
>> >>>>Try looking at http://cdr.stanford.edu/Touch/prox/cpcflctr.html
>> >>>>
>> >>>>I have had the best luck using the LM358. I have another version
that
>> is
>> >>>>vastly superior, but my company will not allow me to release
information
>> >>>>about it yet. The 'classic' capaciflector works well enough. Just
keep
>> >>in
>> >>>>mind that the geometry of the sensor is critical to it's performance.
>> >>>>
>> >>>>Richard Caudle
>> >>>>richard@cqc.com
>> >>>>rwcaudle@hpamonon.com
>> >>>>Frankendaddy (ICQ#20105579)
>> >>>>_________________________
>> >>>>
>> >>>>"Guardians of The Sacred Words: Nee, Ptang, and Neewhon."
>> >>>>
>> >>>>
>> >>>>
>> >>>>
>> >>>
>> >>>Cheers,
>> >>>
>> >>>MACQ
>> >>>
>> >>>
>> >>>
>> >>>
>> >>
>> >>
>> >>
>> >
>> >Cheers,
>> >
>> >MACQ
>> >
>> >
>> >
>> >
>
>--
>Chiu-Yuan Fang
>chiumanfu@home.com
>ICQ=5614919
>http://www.geocities.com/SouthBeach/6897/beam2.html
>
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