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Table Of Contents

15

The middle column is the pin names marked on the extension board, and the

corresponding pin names are provided on its left and right for numbering by BCM and by

wiringPi. The Name column is what the Raspberry Pi defines of the pin. "-" in two columns on

the same line indicates the pin number and name is the same for the two numbering

methods.

Besides, in Python, pins are usually defined by the physical position on the board. From top

to bottom and left to right, the pin is defined as 3V3 (1), 5V0 (2), SDA1 (3), etc., till GPIO21

(40). You'll get to more details in lessons later.