![ir sensor](https://misapuntesde.com/images/2013/08/ir.jpg)
The site *Fresy Metal* presents to us another tutorial. This time to make a laser alarm, because he can't found anyone that work properly.
As always, on its website.
Link: [fresymetal.com](http://www.fresymetal.com/como-hacer-una-alarma-laser-con-raspberry/)