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.