Arduino micro power supply

Projects General Guidance
1

I plan to use an arduino micro to control the 12v fan in my PC case by monitoring the temperature. I will use a mosfet to control the the fan, and use the PCs ATX power supply to drive the fan/arduino.

I'm a little confused around the power supply requirements for the arduino, as I believe the arduino can be powered from 7v-20v, yet also can be powered by USB. Preference from what I've seen is not to exceed 12v.

As I have 12v & 5v available from the ATX, I'm in doubt as to whether to use the 12v supply (which could exceed 12v) or the 5v - not sure how this would be connected or if it would be enough?

2

Use the 5V put into the 5V pin of an Uno development board.

The 7 to 12V is ran to a regulator on an Uno to bring it down to 5V. USB is 5V and is directly used to power the uno instead of being converted to 5V by the regulator.

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3

Excellent, thanks for your help.
I will try using the 5v supply.

4

Hi,
Do you want to just turn the fan ON and OFF or want to vary its speed?

Tom... :grinning: :+1: :coffee: :australia:

5

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