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PICList Thread
'a project for you all'
1997\01\07@014854 by Bob Blick

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For work-avoidance therapy over the holidays I amused myself by building a
clock. You might want to take a look at it, it's fairly novel, and it uses a
16c84.

Unfortunately my web server is changing addresses, so the link may not
resolve properly. If you have trouble, just try again in a couple of days.

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

-Bob

1997\01\07@020403 by Shel Michaels

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Bob Blick wrote:

<< For work-avoidance therapy over the holidays I amused myself by building a
clock. You might want to take a look at it, it's fairly novel, and it uses a
16c84. >>

Check-it-out, crew!  His "propeller" clock is really nifty!!  Nice writeup,
too, Bob.

Shel Michaels
Massachusetts, USA

1997\01\07@114301 by myke

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FROM: M.A. Predko, (416)448-4793, Tie Line 778-4793, FAX x5998
*** Resending note of 01/07/97 10:13
Advisory Engineer - OEM Test Engineering
System Board and Advanced Systems Business Units
Subject: a project for you all

Wow Bob!

Really Sexy and Clever Project.

Just out of curiosity, how long does the Supercap (47 uF) stay charged
when the motor isn't running?

myke

For work-avoidance therapy over the holidays I amused myself by building a
clock. You might want to take a look at it, it's fairly novel, and it uses a
16c84.


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

-Bob


"There are only three kinds of economists in the world.  Those who can count
and those who can't." - Eddy George, governor of the Bank of England

1997\01\07@121033 by David Tait

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Thanks to Bob for a really fun project.  If you are interested in
another "persistence of vision" clock, the UK magazine Everyday
Practical Electronics (Sept '96) had an article on such a thing.  It
was called the PICTOCK and the LEDs were attached to a pendulum.
You'll have to get the article for the constructional info but the
16C84 program that goes with it can be found here:

ftp://ftp.epemag.wimborne.co.uk/pub/PICS/PICtock/

Actually, I'm not so keen on digital clocks and much prefer an
"analogue" display.  When I find some time to waste I'll have to
modify Bob's stuff so that a string of spinning LEDs show clock
hands.  I'll add it the growing list of such projects - sigh.

David
--
http://www.man.ac.uk/~mbhstdj

1997\01\07@153743 by Bob Blick

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>Just out of curiosity, how long does the Supercap (47 uF) stay charged
>when the motor isn't running?
>

I never really timed it, but definitely at least a minute or so before the
chip locks up. With a 1 mA load, a 47000uf cap should take 47 seconds to
lose one volt, but supercaps are weird, and seem to have a large amount of
self-discharge above about 4 volts.

Thanks to everyone for the nice comments, this was my second PIC
program(though the first one was over two thousand lines), so it's nice to
get a pat on the back from those with more experience. No one commented on
my programming style, so I guess it was ok. PICs are a lot more fun than
some other microprocessors, and make assembly language programming a breeze.

Of course I have the PICLIST contributors to thank for some of the nicer
little bits of code buried in there(like Scott's edge detection scheme, sweet).

David, thanks for providing the link to the PICTOCK clock, I looked at it.
Talk about a different style of programming, eh?

-Bob

1997\01\07@223026 by Prashant Bhandary

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Many moons ago Elektor came out with an issue which contained nothing but
projects using empty soft drink cans. Among the assorted circuits in there
was one where the can had a column of LEDs mounted and was rotated using a
motor. An LM3914(or one of those chips which drive an LED bargraph based
on a voltage input) chip was connected to these LEDs and the result was
an oscilloscope! The time sweep is adjusted by changing the speed of the
motor.

Memories of the issue are pretty dim now... One of the projects was a can
with a battery driving a motor with an off-centre weight on it. A mic
circuit in the can then responded to hand claps and would roll the can when
that happened.

Regards

Prashant
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1997\01\08@061853 by Harry B. Morton III

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At 02:31 PM 1/8/97 +1100, you wrote:
{Quote hidden}

I think that project was in Nuts and Volts. I also think that I may still
have the back issue of it.

Harry
hmortonspamKILLspamwnis.com

1997\01\08@092917 by Wireless Scientific

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At 2:31 PM 1/8/97, Prashant Bhandary wrote:
>Many moons ago Elektor came out with an issue which contained nothing but
>projects using empty soft drink cans. Among the assorted circuits in there
>was one where the can had a column of LEDs mounted and was rotated using a
>motor. An LM3914(or one of those chips which drive an LED bargraph based
>on a voltage input) chip was connected to these LEDs and the result was
>an oscilloscope! The time sweep is adjusted by changing the speed of the
>motor.

That cokescilloscope would probably be hard to trigger.

1997\01\08@120551 by Conor O'Rourke

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> Many moons ago Elektor came out with an issue which contained nothing but
> projects using empty soft drink cans. Among the assorted circuits in there

Whoa! That's a staggeringly long time ago - circa 1979 I believe.

[snip]
> Memories of the issue are pretty dim now... One of the projects was a can
> with a battery driving a motor with an off-centre weight on it. A mic
> circuit in the can then responded to hand claps and would roll the can when
> that happened.
>
> Regards
>
> Prashant

Didn't they build a train engine (unpowered, unrollable!) by getting all
these junk components and gluing them on to a Coke can? Looked quite
well as far as I remember. There was also a competition to identify the
most components glued to the 'train'!!

Conor.

-------------------------------------
Conor O'Rourke. .....corourkeKILLspamspam.....ccvax.ucd.ie

1997\01\08@145633 by Andrew Errington

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I have that Elektor magazine!  The topic was 'cantronics' and each
project had to make use of a soft drink can (I won't say Coke can, for
fear of reprisals from Pepsi drinkers).  The spinning oscilloscope could
easily be adapted for a message display or clock.

Anyway well done Bob, you seem to have hit a happy note.

Andy (the other one)

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