This is a laser cut acrylic fixture I made to embed an arduino powered parking sensor in a standard low voltage electrical box in the wall of my garage. The acrylic I used was listed at 3mm thick, but the actual thickness is 2.5mm so be careful what you buy. The cut pieces will only fit together with a 2.5mm sheet. The arduino project .ino is also included in the files. The code is a little messy as I had to go through a few revisions to get it working correctly and I haven't done any refactoring yet.