Im looking to build a 12v DC fan controller with a temp sensor to dictate when and how fast the fan spins and cant see any reason why I wouldn't be able to just use a cheap DC Motor shield from ebay to drive the fan and control its speed.
As far as im aware a PC FAN is just a Brushless DC motor which operates at 5-12v with a relationship between Voltage supplied and the RPM of the fan. I would be using small fans drawing .09A each (between 6 and 8 of them wired together with a total current draw of around .72A)
Can anyone confirm that this is a plausible solution before I go ahead and order a motor shield from ebay? Can anyone foresee any problems I would encounter doing this?
I would be using something el'cheapo like this - - - > http://www.ebay.com.au/itm/Motor-Drive-Shield-Expansion-Board-L293D-For-Arduino-Duemilanove-Mega-UNO-/280844181299?pt=LH_DefaultDomain_15&hash=item41639e1f33&_uhb=1