What you need: 3 crocodile-clip wires 9V battery LEDs Assorted resistors Asparagus THE candle. It is a simple technology, and a good one. The electronic version is also simple to make, and is a ...

If you want an easy project to complete in a day or so, or something to introduce kids to the world of robots and electronics, make this light-following robot your weekend project.

To make your own, you’ll need some wires, a small slide switch, and know how to solder. Beyond that, the rest of the build is comprised of pieces from an old 9v battery.

Since I’m starting to use more 9V rechargeable batteries, I thought it would be a good idea to build a simple 9V rechargeable battery for my friendly guitarist instead of having to urge him to look ...