I am a robotics, electronics, and machining enthusiast. Most of my projects are documented on http://www.robotroom.com/ -- which led to two books: Robot Building for Beginners and Intermediate Robot Building.
Professionally, I write application software, such as Mac games (TaskMaker, MacSki), police and firefighter communication (TxMessenger), predictive analytics, and now linguistic tools. Recently, I self-published the PCB layout tool Copper Connection.
To try to win the HackADay prize!
Sandwich is a line-following robot targeted at beginners. It uses a simple comparator for a brain and uses a plastic sandwich container for a body.