Fritzing

This project shows how to connect, controland read an 4 wire computerfan,

INTRODUCTION.
This is the first one of several little projects that i
intend to upload, they explain the working of usual
or undocumented parts that i experimented with.

To power the fan you need an external powersource, in this case i used a 12 volt 1,5Amp DC Adapter.
But any other source that meet the requierements ofthe fan wil do.

Hardware:
  Arduino UNO-R3
  External powersource 12volt DC 1,5 Amp
  Potentiometer 1 KOhm.
  4 wire fan

Wiring:
The wiring colorcode for fan i used is as follows.

      Nidec TA350DC  Nidec TA450DC

+ 12 volt  Red                      Red
- 12 volt   Black                    Black
PWM       yellow                  White
Sensor    Blue                     Blue

Make sure that -12volt eg Gnd is connected to the Arduino Gnd.

Libraries.
No aditional libraries are needed.

Output:

The output of the code is just on the serial port.
So after flashing, open the serial monitor for
reading the values.

Potentiometer:
The potentiometer can easely be replaced by any sensor, as long as the output on the PWM port is converted to 0 to 255.
For example with an Temp. sensor you can control the cooling of your tablefan, or the cooling of your campervan fridge.

Good Luck, Jay