http://www.apcc.tk/diy-projects/pwm-arduino
http://forum.arduino.cc/index.php?topic=204505.0
http://forum.arduino.cc/index.php/topic,96170.0.html
http://www.barnesian.com/arduino-powered-smart-fan-controller/
http://swingleydev.org/blog/p/1948/
http://arduinotemperaturecontrolledfan.blogspot.it/
...
...
dovreste impare a usare google prima di arduino
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ciao