Need a good excuse to duck out on the family over the holidays and spend a few hours in your shop? [Jens] has just the thing. He built a color-mixing toy that looks great and we’d bet you have ...

Some readers may recall building a line-following robot during their school days. Involving some IR LEDs, perhaps a bit of LEGO, and plenty of trial-and-error, it was fun on a tiny scale. Now imagine ...