My latest clock

[Morris Odell]

Hi all,

I don’t have a great output of clocks what with work and all but here’s one I just got going.

http://youtu.be/KiJ3dhK6-Ws

It uses a AVR Mega32 as the processor, a Motorola Oncore VP timing receiver and has  PIR switch to turn off the display when nobody’s there (very Zen). The most interesting bit of design was the random number generator used to index into the dictionary. It uses a zener noise source and feedback circuit to ensure symmetrical distribution of 1’s and 0’s. There’s a Von Neumann algorithm in the firmware to iron out any residual asymmetry.

It’s amazing how the four letter word hypnotizes people who can’t wait to see what it’ll say next…..

Morris

 

[Jon D.]

Very nice. Is this an open source design?  I would be interested in design details like the schematic and source code/firmware if you're sharing.  If not, thanks for posting and nice build.

[threeneurons]

Morris,

Its good to see that you're still at it. Nice job ! Always like hearing about people random number schemes. I think my clock output is on par with yours. I haven't made one since ~2010, and before that ~2006. 

[greg...@hotmail.com]

Are those 7971 tubes ? Sure wish I had a few of them.....OK, I confess, I wish I had tons of them.....

[robin bussell]

Nice!
I like the PIR idea, for extra Zen points it should also always be
in rude mode while the display is blanked ;)

Cheers,
Robin.

On 13/09/2013 10:45, Morris Odell wrote:
> Hi all,
>

> I don�t have a great output of clocks what with work and all but here�s

> one I just got going.
>
> http://youtu.be/KiJ3dhK6-Ws
>
> It uses a AVR Mega32 as the processor, a Motorola Oncore VP timing

> receiver and has PIR switch to turn off the display when nobody�s there

> (very Zen). The most interesting bit of design was the random number
> generator used to index into the dictionary. It uses a zener noise

> source and feedback circuit to ensure symmetrical distribution of 1�s
> and 0�s. There�s a Von Neumann algorithm in the firmware to iron out any
> residual asymmetry.
>
> It�s amazing how the four letter word hypnotizes people who can�t wait
> to see what it�ll say next�..
>
> Morris
>
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