I need to make a fan controller.

[shadow]

Originally Posted by Mad_Professor

Wow that's crazy.

Anyways,
I'm ordering my stuff from digikey.

But I don't know what kind of inductor I want?

I'm guessing the one I want is going to be "FIXED" but there are so many variables and types, Half the stuff in the columns doesn't make any sense to me.

Also does AREF need a ceramic cap?

I just checked the datasheet for the ATMega168 microcontroller. It is a bit confusing, however it says that analog reference voltage can be set to either AVCC, 1.1V or an external voltage connected to the AREF pin. For your case, I would suggest that AVCC is the most appropriate setting (and probably the default configuration). The datasheet does also say that you can connect AREF to ground using a small capacitor (the ceramic capacitor you are talking about) for greater noise immunity.

Therefore I would say it is up to you whether you place a capacitor there or not. I do not think it will greatly affect the operation of the circuit for your purposes.