4 layers85 × 56 mm

Boards in 2 GitHub repositories, designed in KiCad, that use the BC848B by Nexperia (-65℃~+150℃ 1 NPN 100MHz 100mA 200 200mV 250mW 30V 5V 5uA NPN SOT-23 Bipolar (BJT) ROHS). See how each wires it, with its parts, size, README and files; the BC848B’s symbol, footprint and pinout are on its own page.


stephaneamans/app-home_automation
The general principle is based on a centralised ECU (Raspbery Pi) with an optional coprpocessor (STM32) used to manage low speed IO.