I have another little project, I'm sure it's probably simple. However, I've searched and searched. I simply want to control a 5v fan with a switch. The Arduino Nano will also be controlling a NeoPixel. The fan will be connected to an external power source. I would just like a little guidance on how to wire up the fan, and how to turn it on and off using a pushbutton and the Nano. Nothing fancy, no variable speed or temperature control. Just on and off.
Thanks!
Show us an image of the fan.
Not the PWM one... the 3 Pin one.
This will probably be a 12V fan.
Yellow RPM
Red +12V
Black 0V
Connect Red to 12V.
Black to a logic level N MOSFET to GND (0v)
Or Black to a relay contact then to GND.
If this makes sense, you probably have the skills to see if the wiring will work.
The kickback diode shouldn’t be needed.
It's a 5v fan. Here's the link https://a.co/d/g07cwnx
You can actually run this fan with a USB connected to your computer. 
The same circuit will work, use 5V instead.
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