common ground

I’m creating a Kicad PCB design to replace a breadboard circuit I’ve built that helps drive three stepper motors controlled by an ESP32, TMC2208 controllers and a 4x4 keypad. The breadboard setup works well. I’m now on to designing the ground fill zone and reading tutorials etc I’m become...

that title is quite a bit clunky, hope I'll do better job explaining what my problem and requirement is here: I have a circuit that has two PSUs: one for MOSFET driver chip (PS2); one for Raspberry pi (like) board (PS1). The driver is driven by the LTV-3120 driver which has it's input...