Two nights ago, I couldn’t find any sleep, so I figured I might as well put that time to use and build some laser barriers for my smarthome. As it turns out, I already built reed switch devices, and swapping the reed switch with a photoresistor was all I had to do hardware-wise. A software update and a freshly printed case later I’ve finished the project.
For the laser itself, I used a cheap chinese laser module soldered to one of my >30 5V power supplies that I had sitting around waiting for a purpose. I knew they’ll come in handy one day.
It’s even more fun combined with push notifications.