How about sticking a small magnet on that board and then attaching a hall effect sensor or reed contact on the other side. One as "zero reference" or one at each PIR location so you can use this to know when you're pointing in that direction.
How about sticking a small magnet on that board and then attaching a hall effect sensor or reed contact on the other side. One as "zero reference" or one at each PIR location so you can use this to know when you're pointing in that direction.