GPIO
GPIO: General purpose input/output. We will introduce the specific feature of the pins on the Raspberry Pi
and what you can do with them. You can use them for all sorts of purposes. Most of them can be used as
either inputs or outputs, depending on your program.
When programming the GPIO pins there are 3 different ways to refer to them: GPIO numbering, physical
numbering, WiringPi GPIO Numbering.
BCM GPIO Numbering
Raspberry Pi CPU use BCM2835/BCM2836/BCM2837of Broadcom. GPIO pin number is set by chip
manufacturer. These are the GPIO pins as that computer recognizes. The numbers are unordered and don't
make any sense to humans. You will need a printed reference or a reference board that fits over the pins.
Each pin is defined as below:
For more details about pin definition of GPIO, please refer to http://pinout.xyz/
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