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Configuring the Pi for I2C

by Kevin Townsend
If you're using a Raspberry Pi, follow the steps below to configure it to use the I2C interface. If you're using a Beaglebone Black with its standard Debian distribution, you can skip this page and move on to the next step.

Before you can get started with I2C on the Pi, you'll need to run through a couple quick steps from the console.
Check out this tutorial for more details and follow it completely

http://learn.adafruit.com/adafruits-raspberry-pi-lesson-4-gpio-setup/configuring-i2c

When you're done, run
Copy Code 
sudo i2cdetect -y 0 (if you are using a version 1 Raspberry Pi)
sudo i2cdetect -y 1 (if you are using a version 2 Raspberry Pi)
This will search /dev/i2c-0 or /dev/i2c-1 for all address, and if an Adafruit BMP085 Breakout is properly connected it should show up at 0x77 as follows:
raspberry_pi_i2ctools_i2cdetect.png
Once both of these packages have been installed, you have everything you need to get started accessing I2C and SMBus devices in Python.
OVERVIEW HOOKING EVERYTHING UP
Last updated on 2015-05-04 at 04.27.56 PM Published on 2012-08-14 at 01.07.18 PM

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