The LCD in the middle is the simplest one. It is a shield with LCD and buttons all in one. The A1-A5 just leads out appropriate pins from Arduino board. They can be analog but also digital. It depends on setting.
The LCD in the middle is the simplest one. It is a shield with LCD and buttons all in one. The A1-A5 just leads out appropriate pins from Arduino board. They can be analog but also digital. It depends on setting.