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Topic: Voltage of the pins on Arduino Uno  (Read 16129 times) previous topic - next topic


 I would like to know what voltage is outputted on digital pins of the Uno.  Can this output be directly connected to the anode of one of the provided leds?

thanx in advance for your answers


Hello IamFirstSecond,

Thank you for posting in Arduino Forum.

The output of the digital pins of Arduino UNO is 5V. As this board operates in 5V, logical high output is 5V. So, yes, you can connect this to an LED anode with a 220 Ohm resistor in between to not allow so much current that could damage the LED.

I hope this helps!
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