Searching \ for '[EE]: light wands' in subject line. ()
Make payments with PayPal - it's fast, free and secure! Help us get a faster server
FAQ page: www.piclist.com/techref/index.htm?key=light+wands
Search entire site for: 'light wands'.

Exact match. Not showing close matches.
PICList Thread
'[EE]: light wands'
2002\08\16@134211 by Brendan Moran

flavicon
face
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Was browsing thinkgeek http://www.thinkgeek.com when I came across this neat
little device.  It seems to be a lightwriter, (I think I've heard
these discussed on the list before) but their description confuses me
a little.  I understand the concept in principle, it's pretty simple
to build something like this (i.e. Tony's propeller clock), but this
excerpt shows the problem I have with it:

"Fantazein has a rapidly oscillating wand carrying tiny lights
(LED's) at its tip that creates the rare display. As the wand whips
through space, the LED's shimmer at megahertz speed so that you see
their light but cannot see the wand"

Megahertz speeds?  From a mechanical oscillator?  How would the
stresses not tear it appart?  Or is this just miswritten?

Regards,
- --Brendan

-----BEGIN PGP SIGNATURE-----
Version: PGPfreeware 6.5.8 for non-commercial use <http://www.pgp.com>

iQA/AwUBPV05EgVk8xtQuK+BEQJgjwCg6L4rUyosVTb9EhySWedIVvqIyWwAmQFO
GADWNl/sgjsQhqTDsuQlnfs0
=uWku
-----END PGP SIGNATURE-----

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics


2002\08\16@134808 by Jim

flavicon
face
On the order of .0001 MHz (100's of Hz) is more like it.

Perhaps this is just a case of "create spec writing" ...

RF Jim

{Original Message removed}

2002\08\16@140317 by Wouter van Ooijen

face picon face
> "Fantazein has a rapidly oscillating wand carrying tiny lights
> (LED's) at its tip that creates the rare display. As the wand whips
> through space, the LED's shimmer at megahertz speed so that you see
> their light but cannot see the wand"
>
> Megahertz speeds?  From a mechanical oscillator?  How would the
> stresses not tear it appart?  Or is this just miswritten?

They probably refer to the speed at which the LEDs are switched to
create the image. Add a bit of sales talk (hey, this works like a TV,
right? A TV video signal is a few MHz, right? OK, I know what to write!)

Wouter van Ooijen

-- -------------------------------------------
Van Ooijen Technische Informatica: http://www.voti.nl
consultancy, development, PICmicro products

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics


2002\08\16@140542 by Hazelwood Lyle

flavicon
face
Could it be the difference between wand speed and LED
switching speed?
Whatever the wand sweep rate, the LED's would have to
be modulated at a minimum of sweep rate * 2(Back + Forth) * Horiz Res.
If you want to blank the dots in between as Olin suggested,
you can double the rate again.

Of course, the undertermined factor here is how fast you can
whip your wand.
Lyle H

>On the order of .0001 MHz (100's of Hz) is more like it.
>
>Perhaps this is just a case of "create spec writing" ...
>
>RF Jim

{Original Message removed}

2002\08\16@141124 by Brendan Moran

flavicon
face
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

> On the order of .0001 MHz (100's of Hz) is more like it.
>
> Perhaps this is just a case of "create spec writing" ...

My guess was more along the lines of "if you sum the blink rates of
all the LEDs together, then they blink at several MHz

I didn't believe that a piece of plastic could move at MHz without
failing rapildy.

- --Brendan

-----BEGIN PGP SIGNATURE-----
Version: PGPfreeware 6.5.8 for non-commercial use <http://www.pgp.com>

iQA/AwUBPV1AOAVk8xtQuK+BEQJuTQCfTTscCE4vSPuJaCEdXfxxfLk679IAn1b5
PrSQtP0swZbH9tU6f/nVcNjF
=t8hc
-----END PGP SIGNATURE-----

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics


2002\08\19@070459 by Michael Rigby-Jones

flavicon
face
{Quote hidden}

Well, it does say that "the LED's shimmer at MHz speed", not the plastic
wand.

Regards

Mike

--
http://www.piclist.com hint: To leave the PICList
piclist-unsubscribe-requestspamKILLspammitvma.mit.edu


2002\08\19@124946 by Brendan Moran

flavicon
face
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

> Well, it does say that "the LED's shimmer at MHz speed", not the
> plastic wand.

True enough, but it's still a bit misleading...

And, anyway, being a bit of a picster myself ;) If I want something
like that, I'll have a lot more fun building it than buying it :D

- --Brendan

-----BEGIN PGP SIGNATURE-----
Version: PGPfreeware 6.5.8 for non-commercial use <http://www.pgp.com>

iQA/AwUBPWEhggVk8xtQuK+BEQLyrQCfcJY8afvqRWuSWl9BSYK95rvteMUAoJBA
rHMqxEUjE28FVuiT0B+lL9sY
=SXku
-----END PGP SIGNATURE-----

--
http://www.piclist.com hint: To leave the PICList
.....piclist-unsubscribe-requestKILLspamspam.....mitvma.mit.edu


More... (looser matching)
- Last day of these posts
- In 2002 , 2003 only
- Today
- New search...