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:

Qwiic MUX Hookup Guide

Have a bunch of sensors with the same I2C address? Put them on the Qwiic MUX (TCA9548A) to get them all talking on the same bus!

Hookup Guide for the SparkFun RedBoard Artemis

Get started with the RedBoard Artemis - all the functionality of the SparkFun Artemis module wrapped in the familiar Uno R3 footprint

SparkFun Photodetector (MAX30101) Hookup Guide

The SparkFun Photodetector - MAX30101 (Qwiic) is the successor to the MAX30105 particle sensor, a highly sensitive optical sensor. This tutorial will get you started on retrieving the raw data from the MAX30101 sensor.

Triple Axis Accelerometer Breakout - KX13x (Qwiic) Hookup Guide

Get started measuring acceleration and vibration using the Triple Axis Accelerometer Breakout - KX134 (Qwiic) & KX132 (Qwiic) following this Hookup Guide.

Looking for more inspiration? Check out some of these blog posts for ideas: