This file is from the board that I have, someone can make a "list" of which number I put to access for example the A3, or 9~, etc ...
On my board have 3 leds in it, to tinker with they are the 0, 1 and 2, so I do not know which is the 7, A0.
0 to 13 are digital only pins. A0-A5 are 14 to 19, but can used as analog input also.
There 4 LEDs - power, L (which can be driven on and off with a low or high on 13), and th Rx and Tx lights, which are controlled by the USB/Serial interface. Your sketch cannot control them.
RickMortinson312:
This file is from the board that I have, someone can make a "list" of which number I put to access for example the A3, or 9~, etc ...
On my board have 3 leds in it, to tinker with they are the 0, 1 and 2, so I do not know which is the 7, A0.