The pi either uses a 40 pin or 26 pin depending on the model and it is important to understand how those pins are arranged and labelled. Wiringpi is an attempt to bring arduino wiring like simplicity to the raspberry pi.
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Hardware interfaces for the raspberry pi 2 and raspberry pi 3 are exposed through the 40 pin header j8 on the board.
Raspberry pi 2 pin layout. Pins 1 2 39 40 are also labeled below. Gpio pinout rasp pi 1 rev1 and rev2. Raspberry pi 2 3 pin mappings.
This gpio pinout is designed to be both a quick and interactive reference to the raspberry pi gpio pins plus a comprehensive guide to your raspberry pis gpio interfaces. Raspberry pi gpio pins using wiringpi notation. This pinout diagram will help you get familiar with the layout of the board and get started in immersing yourself into your own passion projects.
5 minutes to read. Raspberry pi gpio layout model b. As a result for example a program that uses wiringpi pin 2 on a rev.
One of the most significant changes to the raspberry pi model b is the 40 pin header j8. The comprehensive gpio pinout guide for the raspberry pi. The goal is to have a single common platform and set of functions for accessing the raspberry pi gpio across multiple languages.
The raspberry header is the key to its ability to interface with the real world. Raspberry pi pinout diagram circuit notes how to navigate your raspeberry pi 3 model b. This higher spec variant increases the raspberry pi gpio pin count from 26 to 40 pins.
Weve provided some basic examples to help you discover possible uses for your raspberry pi and to get started with software available in raspbian. The hummingboard with its quad core power larger storage space and faster interfaces is a strong competitor for the raspberry pi. By matt on july 18 2014 model b.
Pi however someone using bcmgpio pin 21 on a rev 1 pi will need to change their program to use bcmgpio pin 27 on a rev 2. 1 pi will work unchanged on a rev 2. Raspberry pi b gpio header details and pinout 12.
The raspberry pi 2 model b board contains a single 40 pin expansion header labeled as j8 providing access to 28 gpio pins.