Re: DIY darkroom timer project

My interest would be as follows,

I would probably want to purchase a PCB, could also get by with wire wrap.
I am in the US and have limited electronics knowledge but love to do it
yourself. I have dones some electronics projects from scratch with plans.
For me the joy is in making it work not in doing all the steps in the
process. If I needed to make my own PCB the options would be to physically
lay out the traces and pads by hand. Very tedious and prone to mistakes or
purchase a kit to photographically create the board from a electronic
distribution. The purchase of the starter supplies for the photographic
process make it almost cost prohibitive. By the time supplies were
purchased and components I could purchase a used digital timer from ebay.

I currently own a digital timer Beseler Digi-timer. The improvements over
this unit I would like are.
1) Rotary switch to set time. One direction would increment the time up the
other direction would increment the time down.
2) I find the top time of 99 seconds to be to small when working with bitter
enlargements.
3) It would be nice to be able to have tenths of a second as well as double
digit exposure. Not a limit of 9.9 seconds in tenths mode.

I have currently written a software for the palm pilot that works as a
darkroom timer. There is a relay arrangement that I connect to the serial
port that switches the enlarger. This currently is my favorite timer. It
has overcome the limitations above and also gives me a automated test strip
printer for even intervals or fstop intervals.

"Martin Riddle" <(E-Mail Removed)> wrote in message
news:ZtUNa.83621$(E-Mail Removed) thlink.net...
> There was some interest in such a project.
> My question is how many here are willing to construct their own?
> Would you prefer a thru-hole design over a surface mount design?
> Would you fabricate your own PCB, purchase it, or wire wrap?
> Are there any specific models of timers that you would like to copy?
> Wall or desk mount case??
>
> These are just some fabrication issues, and may even be chosen based on
part availability in your
> area. So if you don't mind just note where your from US, UK, etc...
>
> Currently I have some ideas, but nothing is drawn up yet.
>
> Cheers
> Martin
>
>





Ron Shenk

Ron,

is that software for Palm and way of connecting to enlarger publicly
available?

"Ron Shenk" <(E-Mail Removed)> wrote in message news:FsePa.6091
>
> I have currently written a software for the palm pilot that works as a
> darkroom timer. There is a relay arrangement that I connect to the serial
> port that switches the enlarger. This currently is my favorite timer.


--
-richo-
http://piskoftak.sk/