Hello, I'm trying to switch a 12v voltage with my Arduino. I've built a fan controller with PWM, and now I want to be able to switch them completly off, cause I've got a watercooling loop. For some reason, if I switch the ground of the fans, they still run. (My guess is thats because of the voltag…

SOLVED: Optoisolator output 1v instead of 12v

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