This is a stupid questions: is the HIGH voltage from the PWM pins on the Diecimila 5V or 3.3V?
I need to use it to control this: http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=Z906-ND, which take input voltage of 4-6V.
Thanks,
Zach
Reading the arduino site reallyhelps 
Yes it is 5V
David
Sorry, didn't see that part originally. So the 3.3V is just for providing power to external components?
mostly, but the digital pwm can read it so if you use the 3.3 V on the arduino to do somthing similar to this:
http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1228874758/11
remember that max DC Current for 3.3V Pin is 50 mA.
Do not exeed it!
David
Interesting. So I can use either the 3V or 5V pin with the digital pins in place of ground to set the max voltage?
So I can use either the 3V or 5V pin with the digital pins in place of ground to set the max voltage?
No the 3V3 output is simply a voltage output there is no control over it.