Hi there. I tried to search the forum, but couldn’t really find anything about it.
I have recently dusted off my old Arduino NG. I Have created a cooling controller for a small server rack. It’s constructed with a resistor (receiving a PWM signal) to control the fans.
Worked fine with my small test fan (powered from the arduino), but i want to connect 4 high-power ones for final install. I fed the transistor/fan power from my bench-supply, and the arduino still from the USB cable.
I know the arduino and the benchsupply need common ground. But how do i do that exactly? Do you just connect one of the Gnd pins on the arduino to the “-” on the power supply?
Im sorry if this have already been answered before…