I'm using this 12 channel MOSFET shield and running into some issues related to duty cycle when I turn multiple FETs on at the same time. I think I've narrowed the problem down to the shield not using any resistors with the FETs.
When I digitalWrite(FET, LOW) to one of my FETs, it doesn't fully turn off my drain. See pic below. That ripple is when I pull the pin to LOW. Is this normal, or am I able to fully turn off the FETs? These are the MOSFETS installed on the shield: PSMN3R4-30PL