Arduino boards support output supply voltage of:
a. 5V only
b. 3.3 V only
c. 9 V only
d. 5V, 3.3V
Answers
d. 5V, 3.3V
U can trust this I am an arduino programer
Answer:
Concept:
Either an external power source or a USB connection can be used to power the Arduino Duemilanove. The power source is automatically chosen.
Explanation:
Either a battery or an AC-to-DC adapter (wall-wart) can provide external (non-USB) power. A 2.1mm center-positive plug can be used to connect the adapter by inserting it into the board's power connector. The Ground and Vin pin headers of the POWER connection can accept battery leads.
The board can be powered by a 6 to 20-volt external supply. The 5V pin, however, may deliver less than five volts if supplied with less than seven volts, and the board may become unstable. The voltage regulator could overheat and harm the board if more than 12V is used. The suggested range is 7–12 volts.
A 3.3 volt supply generated by the on-board FTDI chip. Maximum current draw is 50 mA.
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