User Manual

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actual pins are corresponding to the Physical on the right. There are 40 pins in total from left
to right. The columns near Physical are the V (voltage), Mode (Input or Output), Name
(original name), wPi (wiringPi, C language based on), BCM (Python based on) of the pins.
Besides the original name of the pins, there are other three ways of naming including physical,
wiringPi and BCM. If you see a pin being defined as 0 in the C language, its original name is
GPIO 0. I n Python code, it’s 17 (BCM) or 11(physical). So you need to know the name,
physical, w iringPi and BCM of a pin.
Extension Board
The function of the extension board is to lead out pins of the Raspberry Pi to breadboard by
GPIO Extension Board to avoid GPIO damage caused by frequent plugging in or out. For
plugging convenience, we designed it in T-shape and name it T-Shape Extension Board.
40-pin GPIO Extension Board
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