enlarger timer!

[Jadedoto]

so i am a bit of a geek and needed a new enlarger timer... i wanted a nice digital one, but those are pricey even used, so i made my own. basically it is an arduino and a relay, power supply and a cut up extension cord... i have been planning it for a few weeks, and took me about five hours to slam together tonight and it works like a charm

http://jadedoto.net/index.php/2010/12/09/diy-enlarger-timer/ has all the pics, schematics and code if you are interested. whaddaya think?

it is programmed to either count up or down, in half second increments... with a focus button. of course, since it is software, i can change the time increments, but for me half a second is plenty good resolution....

[br1078lum]

Fine looking unit Vince.  Have you installed Steve's revision yet?

PF

[Jadedoto]

Thanks

I haven't had the time to play with it. I had to write a paper for class else I was risking my grade... I will probably do that before I use it for an extended darkroom session, as performance without the diode isn't particularly risky, and I just happen to have more 2222's than I can shake a stick at...

Another big modification that didn't even strike me was I might finally be able to have a timer with a foot pedal! My, wouldn't that be nice for a change! I also need to make an on/off switch for it. The last big modification I'd like is to move it to a dedicated microprocessor so it isn't hogging up my whole arduino... Though I did make it modular enough where I just pull out the arduino (it isn't hard-wired or soldered to anything)...