After a few months of competing priorities, I have finally cut the case and installed some of the bits and pieces. The correct buttons just arrived this morning, so I can take out the placeholder buttons and actually wire up the fully-functional Darktimer v1.

Minimal testing suggests the code works fine with the power-saving features turned on -- primarily turning off pieces of the processor which aren't being used. I haven't measured current consumption yet, but now that I"ve got the code blown onto the Arduino Pro Mini, I expect it to be much lower.

The project page is more or less done, and can be previewed here: http://dangerpants.com/labs/darktimer/

Once I have the prototype fully built up, I'll be taking pictures and finalizing the project page. Looks like v1 is code-complete, and the first prototype is only an hour or two from being finished.

Feature ideas for future versions:

• Temperature-aware timers for precise timing of development (this may be a completely different project, too)
• "Repeat" setting for timers when doing repetitive tasks
• Configurable timer series: one for developing film, one for developing paper, etc.
• Upgraded sounds: moving beyond the tone() function