GPIO Extension Board
When we use RPi to do the project, we had better use GPIO, which is more convenient to extend all IO ports
of RPi to the bread board directly. The GPIO sequence on Extension Board is identical to the GPIO sequence
of RPi. Since the GPIO of different versions of RPi is different, the corresponding extensions board are also
different. For example, a GPIO extensions board with 40 pins is connected to RPi as follows:
Practicality picture of connection: