My treadmill broke down and I want to design a controller and LCD display using PIC16F88. I started on the power for the DC Motor that is being controlled by a mosfet with the current sense circuit in case it is overloaded. My concern is the current sense which I get from this forum is of a different ground potential from PIC. My question is, can it sense even if of different ground potential and what is the reference if you measure it? Please find the attached drawing for your reference.