Appendix 1: I2C Configuration

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Step 1: Enable the I2C port of your Raspberry Pi (If you have done enabling, skip this. But if you’re not sure whether you have done that or not, please continue):

sudo raspi-config

8 Advanced options

A7 I2C

<Yes>

<Yes>

<Ok>

<Finish>

<Yes> (If you do not see this page, continue to the next step)

Step 2: Check that the i2c modules are loaded and active:

lsmod | grep i2c

Then the following code will appear (the number may be different)

i2c_dev                     6276    0

i2c_bcm2708                 4121    0

Step 3: Install i2c-tools

sudo apt-get install i2c-tools

Step 4: Check the address of the I2C device:

i2cdetect -y 1      # For Raspberry Pi 2 and higher version
i2cdetect -y 0      # For Raspberry Pi 1
pi@raspberrypi ~ $ i2cdetect -y 1
     0  1  2  3   4  5  6  7  8  9   a  b  c  d  e  f
00:           -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- 48 -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --

If there’s an I2C device connected, the results will be similar as shown above – since the address of the device is 0x48, 48 is printed.

Step 5:

For C language users: Install libi2c-dev

sudo apt-get install libi2c-dev

For Python users: Install smbus for I2C

sudo apt-get install python-smbus