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Preface
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GPIO
GPIO: General purpose input/output. We will introduce the specific feature of the pins on the Raspberry Pi
and how you can utilize them in all sorts of ways in your projects. Most RPi Module pins can be used as either
an input or output, depending on your program and its functions. When programming the GPIO pins, there
are 3 different ways to reference them: GPIO numbering, physical numbering, WiringPi GPIO Numbering.
BCM GPIO Numbering
The Raspberry Pi CPU uses Broadcom (BCM) processing chips BCM2835, BCM2836 or BCM2837. GPIO pin
numbers are assigned by the processing chip manufacturer and are how the computer recognizes each pin.
The pin numbers themselves do not make sense or have meaning as they are only a form of identification.
Since their numeric values and physical locations have no specific order, there is no way to remember them,
so you will need to have 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
Summary of Contents for Raspberry Pi 2 Model B
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