Hey guys, I have an arduino Nano board and I power it via USB/computer. When I measure the 5V output pin using a multimeter, it reads 4.74 volts instead of 5.0 volts... Can anyone explain? I also measured 3.3volt output pin, and it showed 3.34 (which is much better than the 4.74 volts).

5 volt output is actually 4.75 volts

system November 4, 2010, 3:23am 2

The USB port does not provide 5V precisely. The specification says it can be as low as 4.4V.

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