tim... wrote:

Andy Burns wrote:

https://youtu.be/9WiJJgIi3W0

whilst "un packaged" devices is the form that is required, I do still
need them to be on a board that can be wired into a 240 volts circuit
and not 5 volts (I think)

I can see stand-alone radar occupancy sensors from CPC, but I suppose
you need to be careful with any mains voltage, bare board, DIY retrofit
in a shared space within a block of flats.