I am trying to locate a schematic for the Adafruit motor shield v2.3. It has many ports and currently I have found little to no explanation of what is on the board. I located this picture which highlights the motor ports, servo ports, and Arduino Pins. But what about everything else?
What are the pin holes above and below the Arduino pins? Are they secondary positions for the pins? What is the PWMs 0,1,14,15? How is the big empty board in the center setup?