Alt-BEAM Archive
Message #01291
To: BEAM LIST beam@corp.sgi.com
From: Chiu-Yuan Fang chiumanfu@home.com
Date: Thu, 04 Mar 1999 18:16:39 -0800
Subject: [alt-beam] 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
------------------------------------------------------------------------
eGroup home: http://www.eGroups.com/list/alt-beam
Free Web-based e-mail groups by eGroups.com
Home