Hello I'm working on a arduino project that uses a 3.3v pro mini. I don't know if this is a problem or not. But On the Blue pin of a 4 pin fan there is a Speed controller using a PWM signal. On a Arduino Uno board I can control it with no problem on 5v Signal. But Sense I would like to use a Pro mini board and it is 3.3v tolerant Not sure that i would be getting Full Speed out of the fan. I haven't tempted it yet i thought i get some help first before i do.
I need some help can someone help me on figuring this out please? Thank you.