There's also a nasty gotcha in the Pi Pico pinout. Pins 1-20 are listed from top to bottom, in the same order they appear in the board image. Pins 21-40 are lis

There's also a nasty gotcha in the Pi Pico pinout. Pins 1-20 are listed from top to bottom, in the same order they appear in the board image. Pins 21-40 are listed in a second column, also from top to bottom; unfortunately, this is the reverse of their physical position in the board image.