John Wagner from Team Droid writes:
This is just the thing you need to have in your camera bag. I have one that I bought online but if your not in a rush and have the skills to solder this would be a clever little device to have around. Very handy for tripping the shutter when your doing macro work or your doing long exposures where camera vibration is a bad thing.
Check out the plans, source and schematic included!
Via MAKE Blog
Well, John Wagner is the guy that came up with the project, I just blogged about it. We share the same first name.