Lasers are some of the coolest devices around. 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 ...

He’s using an Arduino Uno and an Ethernet breakout board to hook it up to the network. This allows him to send text messages to himself when the alarm system is armed, disarmed, or triggered.

Sure, it might look like an overly complex system on screen ... Powered by an Arduino Uno, this laser tripwire alarm project works much like those in movies. There's a tripwire — made up ...