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On Sat, Jun 09, 2007 at 09:58:04AM +0000, Peter P. wrote:
> I saw on your site that you implemented a clock using d'Arsonval analog meters,
> and the wandering laser spot clock. Your web page does not say if you used a 
> stepper or something else as a motor for the spot. I have these references from 
> that time:

If you take a look at the source code and electrical schematics for the
laser dot clock you'll see I went with the stepper solution. The
mechanics were a lot more simple and robust than any sort of moving
mirror. Interestingly the disadvantages of the stepper, slow slew rate
and visible steps, have turned out to be advantages. The owner actually
rather likes the way if you look real closely you can make out visible
steps, and the 10 second "march" back to the starting point at midnight.

Then again, the fragility and delicacy of a mirror would be a plus too
for the same reasons. Except, then I'd have to fix it every time it
broke or was damaged.

>   http://www.piclist.com/techref/postbot.asp?
>   by=time&id=piclist/2005/12/20/142136a&tgt=_top&key=25uA+and+pwm+&from=
> 
>   http://petertodd.ca/art/meter-clock/
> 
> (interestingly, your meter clock predates my idea in that thread by almost a
> year ...)

If you look into all the "Meter Clock" websites that have popped up,
they all popped up after I posted my meter clock to the web... I know
for sure the guy behind www.meterclock.com was inspired by me for
instance.

> Anyway, the source code for these projects is available on your site. Do you
> plan to make the totalizer code available too ?

Of course. Schematics and hardware drawings too. Just don't expect it
anytime soon, I was hoping it'd be a quick project, but it looks like
it'll be just complex enough that I'll have to put it off for a month or
two.  I've got a major art show coming up July 6th, and I got a major
grant to make art for it. The totalizer (actually going to be called
"Two Choices Hour Meter") is on the end of the list of art I promised 
to make for it...

- -- 
http://petertodd.org
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