9.8: 40 Pin GPIO
- Page ID
- 470295
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A GPIO pin has two values, high (3.3V) or low (0V). Any GPIO pin can be designated by software as input or output.
There are two Pin Numbering Systems the Broadcom (BCM) and the physical BOARD numbering. The BCM is based on the broadcom chip and used in most libraries. There are also two common libraries that are used with Raspberry Pis to control the GPIO pins, the RPi.GPIO and the GPIO zero library.
To find out what your pin assignments are you can go to the command line and type
pinout
Figure \(\PageIndex{1}\): Output of pinout command in the command line of a Raspberry Pi (Belford CC-0.0)This will give you the following output, and you can find more information at https://pinout.xyz/
https://www.raspberrypi.com/documentation/computers/raspberry-pi.html#raspberry-pi-4-model-b