U of S | Mailing List Archive | alt-photo-process-l | Re: Interval mechanism

Re: Interval mechanism

How accurately 4 hours does it have to be?

If it doesn't have to be that accurate, I'd consider astable
multivibrator oscilatting at say 9Hz, and use a
asynchronous counter to scale it by 1/131072 and then trigger
the shutter with the pulse edge. Another (more modern) way may
be to use a PIC or similar cheap programmable chip.

Either way, you want to find a cheap camera with electronic
shutter and motor winder.

If you don't understand what it is, I may suggest to find a
competent electronics enthusiast or amateur radio operator in
your neighborhood and offer something nice.

Ryuji Suzuki
"People seldom do what they believe in.  They do what is convenient,
then repent." (Bob Dylan, Brownsville Girl, 1986)

From: "zeesme@gmail.com" <zeesme@gmail.com>
Subject: Interval mechanism
Date: Sat, 27 Sep 2008 17:14:37 -0400

> Sorry, I know this is a bit off topic but you guys are by far the best
> source of misc camera information... plus the images will be printed in
> salt!
> I'm building a floating a vessel with a 35mm built into it, I need to make
> the camera automatically take a picture every 4 hours. There is a good
> chance this camera will never come back to me so I'm trying to build it on a
> budget, I figure theres plenty of cheap plastic automatic 35s out there
> these days but making it fire that slowly is beyond me. Does an interval
> mechanism like this exist? Any thoughts?
> Thanks so much,
> -Zev