Raspberry Pi enables I2C Devices

# Modify the configuration file
Raspberry Pi has integrated the I2C driver and only needs to be started.
Modify configuration file

Sudo nano/etc/modprobe. d/raspi-blacklist.conf

! [Configure] (http://images.cnblogs.com/cnblogs_com/hangxin1940/466697/o_rasp_i2c1.png "comment the third line ")
Comment out the third line, CTRL + x save

Next, start the I2C module.

Sudo nano/etc/modules

! [Configure] (http://images.cnblogs.com/cnblogs_com/hangxin1940/466697/o_rasp_i2c2.png "add a line ")
Add a line 'i2c-dev'

# Installation Tools

Sudo apt-Get install i2c-tools Python-SMBus

Add the 'Pi 'user to the 'i2c' group

Sudo adduser PI I2C

Restart

Sudo shutdown-R now

# Test I2C
Connect to the I2C device and run the following command:
Raspberry Pi:

Sudo i2cdetect-Y 0

Raspberry Pi Type B:

Sudo i2cdetect-Y 1

The I2C address is displayed.

! [Configure] (http://images.cnblogs.com/cnblogs_com/hangxin1940/466697/o_rasp_i2c3.png "add a line ")

* I have GY-85 9-Axis Module attached to I2C, a total of 3 sensors itg3205 + adxl345 + hmc5883l *