Alt-BEAM Archive
Message #07079
To: beam@sgiblab.sgi.com
From: jester96beam@iname.com
Date: Mon, 25 Oct 1999 20:31:57 -0400 (EDT)
Subject: [alt-beam] Re: Pager Motors & Walkers
> ~~~~~
> this space intentionally left blank
> ~~~~~
Are you trying to mock Dave? ;-)
Chris
---------------------------------------------------
Get free personalized email at http://www.iname.com
7080 Mon, 25 Oct 1999 17:47:06 -0700 [alt-beam] Re: LDR same as CDS cell? "'beam@sgiblab.sgi.com'" Wilf Rigter YES
Wilf Rigter mailto:wilf.rigter@powertech.bc.ca
tel: (604)590-7493
fax: (604)590-3411
> -----Original Message-----
> From: Rik [SMTP:mutant@gate.net]
> Sent: Monday, October 25, 1999 7:44 PM
> To: beam list
> Subject: LDR same as CDS cell?
>
> just wibdering if LDR's are the same thing as CDS cell?
>
> Thanks
> -Rik
>
> www.geocities.com/mutantb0y
7081 Mon, 25 Oct 1999 18:09:48 -0700 [alt-beam] Re: Laser pointers "'beam@sgiblab.sgi.com'" Wilf Rigter The little hand laser pointers are semiconductor lasers similar to LEDs but
lasers can be focused to a very small spot. That is what makes lasers so
dangerous as anyone should know who has ever used a magnifying lens to
concentrate sun light. There are some ultra bright LEDs which can also be
focused on a nearby "target" and are safe to use. Actually it is better to
mount a broad beam "flood" LED on the head which illuminates a reflective
object (like a hand) causing the head to try to center the light on the
object and track the object when it moves. A combination of a IR flood LED
and a focused red LED in the center gives the best effect.
Wilf Rigter mailto:wilf.rigter@powertech.bc.ca
tel: (604)590-7493
fax: (604)590-3411
> -----Original Message-----
> From: James Wilson [SMTP:jameswilson11@home.com]
> Sent: Monday, October 25, 1999 4:39 PM
> To: beam@sgiblab.sgi.com
> Subject: Re: Laser pointers
>
> The LASER (Light Amplification through Stimulated Emissions of Radiation)
> output is of a particular feequency or "WAVE LENGTH" of light. For this
> reason I would expect that the laser pointer that is currently on the
> market
> which uses a HeNe (Helium Neon) gas mixture emmits a visible red light or
> (realy stretching the memory banks here but) 450 nm wave length. If you
> look at the spec sheets for your PD's or LDR's you will see the expected
> response to specfic frequencies of light. But this does bring up an
> interesting design idea. If you could make a receiver that was sensitive
> to
> the emission from the pointer you would have yet another means for making
> bots "talk" to each other.
>
> James :-))
> ----- Original Message -----
> From: Brad Guillot
> To:
> Sent: Monday, October 25, 1999 6:38 PM
> Subject: Laser pointers
>
>
> > i am hopefully going to set up a laser pointer on my solar head bot that
> > will "point"at the brightest source of light.(on a different se to save
> > power)
> > before i do this i need to know if the light will affect the
> > photoresistors, i'd try it myself but i don't have any.
> > the laser doenen't seem to affect the photodiodes on either of my
> > photopoppers, but i realize the case may be diferent on the
> > photoresistors.
> >
> > if no one knows than thanks anyway, when they come in the mail i'll try
> > it out for myself.
> >
> > P.S. for those keeping track i belive this is question #3
> >
> > Brad
> > __________________________________________
> > NetZero - Defenders of the Free World
> > Get your FREE Internet Access and Email at
> > http://www.netzero.net/download/index.html
7082 Mon, 25 Oct 1999 21:34:20 EDT [alt-beam] Re: oscilloscopes beam@sgiblab.sgi.com Blumojo13@aol.com I would also be interested in learning more about oscilloscopes.I just bought
a Tektronix type 316 at a yard sale. Thanks for any help. :)
blumojo13
7083 Mon, 25 Oct 1999 18:43:48 -0600 [alt-beam] Re: Pager Motors & Walkers beam@sgiblab.sgi.com Senior LOL
jester96beam@iname.com wrote:
>
> > ~~~~~
> > this space intentionally left blank
> > ~~~~~
>
> Are you trying to mock Dave? ;-)
>
> Chris
>
> ---------------------------------------------------
> Get free personalized email at http://www.iname.com
7084 Mon, 25 Oct 1999 21:46:51 EDT [alt-beam] New Web page beam@sgiblab.sgi.com Blumojo13@aol.com What's the address for your page?
Blumojo13
7085 Tue, 26 Oct 1999 12:00:34 +1000 (EST) [alt-beam] Re: Laser pointers alt-beam@egroups.com Benjamin Edward Hitchcock I'm not normally one to dismiss safety concerns, but the 'keyring' style
laser pointers are pretty safe. Here in Australia, they're regulated to
about 1 mW, which to do damage would mean that you would have to stare
into the beam for over 15 minutes.
I have a 5mW laser pointer which is now illegal to sell in Australia,
because it can do damage to your retina if you stare into the beam for a
sustained period of time.
My friend has a 10 mW pointer, which I wouldn't look into.
I put a laser pointer on another friend's Playstaion gun, to aim the gun
when playing various games. This hasn't resulted in any damage, because
of the low wattage (1mW).
I wouldn't be too worried by this. If you're concerned, then lower the
output strength (There's usally a little pot on the circuit board).
Just make sure its a 1 mW pointer.
Ben
> Brad Guillot wrote:
> >
> > i am hopefully going to set up a laser pointer on my solar head bot that
> > will "point"at the brightest source of light.
>
> Be VERY careful, OK. Those things can blind you. If the beam points
> directly into your eye and strikes the retina, it can do permanent
> damage, leaving you with (literally) a blind spot. I've heard of a few
> cases lately where the laser reflected off a mirror into someones' eyes.
>
> Regards,
> Bruce
>
> ------------------------------------------------------------------------
>
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--
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7086 Mon, 25 Oct 1999 22:04:01 EDT [alt-beam] Re: My Bots beam@sgiblab.sgi.com Blumojo13@aol.com I think your have some cool bots. they remind me of water striders.
blumojo13
7087 Tue, 26 Oct 1999 00:48:27 EDT [alt-beam] BEAM Screen Saver beam@sgiblab.sgi.com "Rik Marshall" since im a multimedia designer .... i figured i would ask how many of you
out there would be interested in a BEAM screen saver? ...
of course it would be free of charge!!!
im thinking ....everyone send in 1pic of their favorite bot ...and then i'll
make a screen saver!
anyone interested???
** please dont send pics yet...im just putting the idea out there...i'll let
ya know what the response is..and when to send me the pics! **
-Rik
www.geocities.com/mutantb0y
______________________________________________________
7088 Mon, 25 Oct 1999 22:08:47 -0600 [alt-beam] Re: BEAM Screen Saver beam@sgiblab.sgi.com Senior I do prohpesy the election lights on it,
You have my dying vote
Rik Marshall wrote:
>
> since im a multimedia designer .... i figured i would ask how many of you
> out there would be interested in a BEAM screen saver? ...
>
> of course it would be free of charge!!!
>
> im thinking ....everyone send in 1pic of their favorite bot ...and then i'll
> make a screen saver!
>
> anyone interested???
>
> ** please dont send pics yet...im just putting the idea out there...i'll let
> ya know what the response is..and when to send me the pics! **
>
> -Rik
>
> www.geocities.com/mutantb0y
>
> ______________________________________________________
>
7089 Tue, 26 Oct 1999 15:39:16 +1000 [alt-beam] Re: BEAM Screen Saver beam@sgiblab.sgi.com Elmo I'm sorry, my universal translator must be malfunctioning again.
Would you mind repeating that.....perhaps in another language :)
Elmo
Senior wrote:
>
> I do prohpesy the election lights on it,
> You have my dying vote
>
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