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.

Using laser distance meters as sensors is one of the great quests ... The only option seemed to be using the Arduino to simulate button presses on the 390B’s front panel. In an update to ...

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