The analog pins are digital pins too. So on a Uno for example you can do digitalRead() and digitalWrite() using the Ax pin names (A0 etc) and also refer to them by the numbers above 13. (So Uno A0 is the same as calling it 14, A1 is 15 etc.)
The analog pins are digital pins too. So on a Uno for example you can do digitalRead() and digitalWrite() using the Ax pin names (A0 etc) and also refer to them by the numbers above 13. (So Uno A0 is the same as calling it 14, A1 is 15 etc.)