PIR sensor case with universal mount (HC-SR501 )

thingiverse

I wanted a fairly small PIR case with a mounting arm that could be used for something else as well. You can add more links if you want or need more flexibility. There is also openings on the case for adjusting the time and sensor on the PIR. I also used 4mm screws for the swivels but gave the base of the case a extra screw point should you want to use self tapping screw to mount the case to the mounting bracket. I printed the bracket upright with supports as this seemed to be the best way to clean off supports afterwards.