树莓派i2c总线使用 及 i2c-tools python-smbus 的安装

下面我们需要修改树莓派的配置文件使能I2C，通过nano编辑器修改raspi-blacklist.conf 文件内容

pi@raspberrypi ~ $ sudo nano /etc/modprobe.d/raspi-blacklist.conf

写入保存

# blacklist spi and i2c by default (many users don't need them)
blacklist spi-bcm2708

blacklist i2c-bcm2708

打开/etc/modules ，在文件结尾加上 i2c-dev、i2c-bcm2708

pi@raspberrypi ~ $ sudo nano /etc/modules

写入保存

# /etc/modules: kernel modules to load at boot time.

#

# This file contains the names of kernel modules that should be loaded

# at boot time, one per line. Lines beginning with "#" are ignored.

# Parameters can be specified after the module name.



snd-bcm2835

i2c-bcm2708

i2c-dev

更新一次包列表

pi@raspberrypi ~ $ sudo apt-get update

安装 i2c-tools工具与python-smbus

pi@raspberrypi ~ $ sudo apt-get install i2c-tools python-smbus

之后reboot，重启后千万记得打开i2c接口 
否则无法找到i2c地址，出现如下错误： 
Could not open file /dev/i2c-1' or/dev/i2c/1’: No such file or directory 
寻址：

pi@raspberrypi ~ $ sudo i2cdetect -y 1

打开i2c总线方法：

在终端输入 sudo raspi-config