Forget printing circuits: how about drawing ’em instead? At least, that’s what you can do with this rollerball, which spews out conductive silver ink to let you doodle circuits all day long.

I have talked a bunch about some of the cool DIY stuff that I have seen around the web that geeks use Arduino to build. My favorite DIY stuff that people build using Arduino are robots like the ...

The Arduino magnetic drawing machine operates using an Arduino board mounted with a magnetometer. This setup, combined with node.js and socket.io, allows the machine to detect disturbances in the ...