I found this video on YouTube, and I want to try doing the same, the problem is that I dont know how much voltage the GPIO18 has.

Link of the video: https://www.youtube.com/watch?v=86x6NweQsdY

I've been searching for information on google but I'm still not sure about it. It can be a 3.3V or 5V, but I don't know if I can choose, or not.

Any help will be apreciated.


The Raspberry Pi GPIO header has 40 pins. There are two 5V pins, two 3V3 pins, some ground pins, and the rest are general purpose - you can use them as input or output pins. These general pins are variable 3V3 - if you set up a pin as an output pin and set it high, it will give out 3V3 (3.3 volts). See https://pinout.xyz for a reference guide.

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