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I was wondering how much my Arduino I/O pin can output when it is set at Output and is at High.

I am using an Arduino Uno R3.

Thanks in Advanced.

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5

40.0mA.

The Arduino UNO Digital IO pins are connected directly to the IO pins on the ATMEGA328P processor.

From page 299 of the data sheet for that processor...

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Note that there is also a total current limit for all output pins combined, and that the voltage starts to drop as the current goes up.

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    You should probably note that it's never a good idea to go anywhere near the "Absolute Maximum Ratings". Perhaps include the notice that's referred to by the asterisk on that page in the datasheet. – Roger Rowland Jan 8 '16 at 5:23

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