We can use them to cut things, create laser light shows, and also as a rangefinder.[Ignas] wrote in to tell us about [Berryjam’s] AMAZING write-up on creating an Arduino based laser rangefinder.

Building an Arduino speed detector using IR technology to measure the speed of a moving object is much more cost-effective, ...

And then you need the actual working knowledge and experience to wield a tool, be it a hammer, laser ... build include a printed circuit board that serves to break out the connections on an ...