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PICList Thread
'propeller clock update'
1997\01\26@031608 by Bob Blick

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I've made some changes to allow the use of old disk drive motors in the
propeller clock, check it out if you're interested:

http://www.bobblick.com/bob/projects/mclock.html

-bob

1997\01\26@053930 by Mike

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>I've made some changes to allow the use of old disk drive motors in the
>propeller clock, check it out if you're interested:
>
>http://www.bobblick.com/bob/projects/mclock.html
>
>-bob

Hi Bob,

Fantastic idea, I wonder if any one with a helicopter would consider putting
(ultra-high brigth) LEDs on the edges of the blade and flying over the
city at night ?? Or even on the leading edge of a bi-plane - now that would
be interesting calculating the on time against air velocity ?

Incidentally your pictures of the Tandon motor etc are great - very clear
and readable on Netscape 3.0, I'm considering getting a digital camera - what
camera or scanner input did you use ?

Rgds


Mike

Socrates once gave the advice to "by all means get married... If you
get a good wife you will become happy, if you get a bad one you will
become a philosopher."

Become an Engineer and avoid making this problematic decision.

1997\01\26@064249 by Clyde Smith-Stubbs

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Thus spake Mike (spam_OUTerazmusTakeThisOuTspamWANTREE.COM.AU):

> Fantastic idea, I wonder if any one with a helicopter would consider putting
> (ultra-high brigth) LEDs on the edges of the blade and flying over the
> city at night ??

I doubt it - unless they had a death wish. But there is a skywriting outfit
in California that uses several planes in formation (line abreast, I think)
and the smoke generators on each plane are turned off and on under computer
control so that they fly across and draw raster type letters, rather than
the stroked letters conventional skywriting produces.

--
Clyde Smith-Stubbs    | HI-TECH Software,       | Voice: +61 7 3354 2411
.....clydeKILLspamspam@spam@htsoft.com      | P.O. Box 103, Alderley, | Fax:   +61 7 3354 2422
http://www.htsoft.com | QLD, 4051, AUSTRALIA.   |
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1997\01\26@090611 by Walter Banks

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Mike ,
>
> Fantastic idea,

Let me add my congradulations as well.

> I wonder if any one with a helicopter would
> consider putting (ultra-high brigth) LEDs on the edges of
> the blade and flying over the city at night ?? Or even on
> the leading edge of a bi-plane - now that would
> be interesting calculating the on time against air
> velocity ?

It might be even more interesting just trying to sort out the
areo-dynamics and load changes. Something as simple as two
18" strips of masking tape on the leading edge of the wing
roots of a J3 (cruise speed about 65MPH) had a sigificant
effect on the airplane.

I have seen a couple of variations on the moving LED scheme which
are interesting.

1) The exploratorium in San Francisco has a interesting variation
to the moving LED's . It is fixed leds and when you move your head
you see a pattern.

2) A few years ago Mike Gore who works at Byte Craft built a
LED display that turned on when you waved it through the air
it had a sping loaded pendulum with two contacts
that made contact only when it was accellerated. It could
determine the direction of the accelleration and then spell
out a word forward or backwards. It uses a NMOS 6805 that
should tell you how old it is.

The code was written in C and should work on PIC's with minimum
changes. If anyone wants a copy send me a direct email.

Walter Banks
http://www.bytecraft.com

1997\01\26@094602 by Tim Kerby

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Hi
anyone been to Madlab.  They started at the Edinburgh Science Festival and
now do world tours.  They have many PIC projects including "The Spaceflag".
This is seven leds on portb of a 54 with an ir tx, rx and 2 switches on
porta.  You wave it about and it displays messages which you program with
the switches.  Unfortunally you don't get the PIC code.  I use the circuit
to do simple light effects by chasing along the leds etc - spaceflag gets
boring after a few years!!! I seem to remember seeing it in New Scientist
once too.  Have a look at the madlab pages on http://www.madlab.org  A pic
section is comming soon.

Tim



At 09:01 26/01/97 -0500, you wrote:

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