Images are an in-wall occupancy sensor next to a factory Simply Automated US140, a motor unit that sits on the end of a window shade, and a coupla external occupancy sensors, one using an AM312 IR sensor, the other using an LD2410 radar sensor, and finally the insides of the shade motor unit.

In other words, all COTS hardware with an ESP32 inside. Lot of 3D printed bits, some magic indistinguishable from technology, but all Make-able.