Thanks for your insights. I was planning to use mmWave (LD2410?), PIR, BLE tracer and luminance sensor with custom 3D printed case.

Basically, what EverythingSmartHome proposes but ideally, cheaper. And I’ll be able to updates parts of it as technology evolves (i.e. mmWave).

Thanks for your reply. I missed the fact that the Olimex supports 5V, that makes it the best option so far! I’m planning at least 14 sensors so I’m trying to keep it cheap. Everythingsmarthome version of ESP looks nice but as I’m not in the UK, their import taxes make it really expensive for me.