You Do Not connect it to the Arduino, the odds are high that will fry your Arduino and the fan will be OK but not run. Use an external power supply and a DC switch or MOSFET to turn it on/off.
You Do Not connect it to the Arduino, the odds are high that will fry your Arduino and the fan will be OK but not run. Use an external power supply and a DC switch or MOSFET to turn it on/off.