Here is a nifty weekend project. It's a 2-stage shutter remote for my Canon T2i DSLR. The red push button is a full press and the arcade button is a half press. Since it requires less force to push the arcade button than it does the red push button, it functions exactly as the cameras built-in shutter switch. I got the inspiration for this project from a guide on diyphotography.net.
Hardware, software, and just general tinkering