Appendix - GPIO Pins
The GPIO pin charts below are for the Raspberry Pi 3 Model B V1.2
You have a choice of two numbering systems in Python. Import the RPi.GPIO
module:
Or:
The GPIO.BOARD
mode uses the numbers in the gray rectangles from 1 to 40.
The GPIO.BCM
refers to the pins by the "Broadcom SOC channel" number.These are the numbers after the "GPIO" in the coloured rectangles. These numbers changed between model B versions of the Raspberry Pi.
It is safer if you use GPIO.BOARD
numbers in your Python programs, especially if you have an older Raspberry Pi model.
For general input output circuits we suggest you only use the pins with the orange outline around the grey boxes.
GPIO Diagram without Pi
GPIO Diagram with Pi
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