Hello! I am following the class. I am using a Node MCU and I have followed your steps wiring the led in the matching pins of my board because they are not the same. So my PIN13 is something called SD2 that according to different pinout images equals to PIN13.
What's more, your PIN4 is called D0 in my board but it actually equals to PIN4 too. So basically I have made the same connections (having in mind that my board has them in a different part but basically they are the same). So my problem is that when I upload the code, the led lights up and the onboard led flashes very fast at a low brightness and whenever I push the button it lights up with normal brightness.
What can cause this problem?
Thanks in advance!