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What is the output voltage of arduino uno's 9, 10, 11 gpio pins?

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By Guest
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I'm trying to power a RGB Led but it won't even come on so I can only assume I used to much resistance because I didn't know the output voltage. I thought it was 5v but I guess not. So what is the output voltage of arduino uno's 9, 10, 11 gpio pins?

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im pretty sure its 5v or 3.3v. depending on which pin you wire to your breadboard.  gpio pins only are for data in my experience correct me if i'm wrong.

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It should be 5V.

 

Edit: There is a pull up resistor for sourcing voltage. This means that it's output has a limited current. The output voltage will also be tied to the supply voltage of the arduino.

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