This section describes the GPIO numbering for each type of board. 

For **Raspberry Pi 3 & 4** and **Orange Pi Boards**, we are using **Board Numbering System**. In board numbering system, the gpio numbers are base on the order of GPIO pins on the board.

For other boards (generic ARM boards), the numbering system is base on **BCM**. In **BCM Numbering System**, the gpio number are those after **GPIO** keyword. For example, if the pin is named GPIO7, the pin number is **7**.

Please refer to [[https://raspberrypi.stackexchange.com/questions/12966/what-is-the-difference-between-board-and-bcm-for-gpio-pin-numbering | this discussion]] to know the difference between board and BCM GPIO numbering system.


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====== Raspberry Pi 3/4 ======
{{ :4.0.0-beta.1:rpi-gpio-guide.jpg?direct&600 |}}
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====== Orange Pi One ======
{{ :4.0.0-beta.1:orange-pi-one-gpio.jpg?direct&600 |}}
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====== Orange Pi PC ======
{{ :4.0.0-beta.1:orange-pi-pc-gpio.jpg?direct&600 |}}
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====== Orange Pi Zero ======
{{ :4.0.0-beta.1:orange-pi-zero-gpio-pins.jpg?direct&600 |}}