Logitech M555B charging dock part 2

Voltage levels seems to be ok

PCB for the chraging circuit

3D view helps with the PCB design (for clearances)

Voltage drop over diode 1N4001 connected to base-emitter on BC549 lights the LED when docking mouse completes the circuit.

mock-up before making the PCB

Proof of concept for the voltage drop sensing BC549

PCB completed

the circuit fits snuggly inside the compartment