I2C

Contributors:

SFUptownMaker

Resources and Going Further

I²C is a relatively complex interface, and there are many resources out there to help you deal with it. Below are some of the more informative ones.

Wikipedia Article on I²C - Not great, but not a terrible place to start.
- Terminology Concerns
Standards Doc - Phillips Semiconductor became NXP a few years back; this is the official standards doc for I²C.
I²C primer - The official primer on I²C and related technologies.
Linux Tools for I²C - A nice set of tools for working with I²C and related buses in embedded Linux environments, like pcDuino or Raspberry Pi.
Open Source Hardware Association: A Resolution to Redefine SPI Signal Names
Qwiic Connect System

To use I²C over long distances, check out the dedicated PCA9615 differential I²C bus extender.

Qwiic Differential I2C Bus Extender (PCA9615) Hookup Guide

May 31, 2018

Learn how to extend the range of your I2C communication bus with the Qwiic differential I2C bus extender (PCA9615 ) breakout board.

Or check out our SPI and I2C tutorial with a Raspberry Pi.

Raspberry Pi SPI and I2C Tutorial

October 29, 2015

Learn how to use serial I2C and SPI buses on your Raspberry Pi using the wiringPi I/O library for C/C++ and spidev/smbus for Python.

Need some inspiration for your next project? Check out some of these related tutorials:

SparkFun GPS NEO-M9N Hookup Guide

The u-blox NEO-M9N is a powerful GPS unit that comes with a chip antenna, SMA connector, and u.FL connector. We will quickly get you set up using the Qwiic ecosystem and Arduino so that you can start reading the output!

SparkFun Qwiic Button Hookup Guide

A Hookup Guide for the SparkFun Qwiic Button (Red) and SparkFun Qwiic Button Breakout. Goes over connecting the Qwiic Button to an Arduino microcontroller and using it with the Qwiic Button Arduino library.