Camera Intervalometer
Here is a project that I have pend thinking about building using a PIC. This designer used an AVR but almost any processor could handle this task.
http://kalshagar.wikispaces.com/ardTimeLapse
The pin out for the plug is pretty simple. When time permits I will have to throw some parts on a bread board. I will likely used some fixed time values that are selectable vs. using pots.
