FET Switches

Both the pump and the vacuum solenoid valve are controlled by FET switches. Wire STD30NF06L FETs as follows:

FET

The control pin for pump is TinyG’s “Spin” and for vacuum, it is pin “Cool”.

I soldered the FET directly to the connector:

FET on connector

The FET selection is not critical, that is just my “go-to” low level logic FET. If you are building the machine without using the kit, any other FET that switches on with a 3.3V control signal should work.