Pin layouts

Chapter 1 • ATmega boards

Another difference between Pro Mini boards is in the positions and layout of the connection pins. Fortunately, the variations are limited. Here are a couple of popular examples:

The pin layout for the upper and lower rows is identical for all Pro Mini boards. On the right side, the connections (seen here with a pin header attached) are for the serial-toUSB adapter. The analog inputs, A4 to A7, are on the left side of this board.

Here, pins A4 to A7 are located on the inner part of the board. The rest of the pinout is identical. Fig. 1.1b

Fig. 1.1c