I2C on Raspberry Pi - OS and Library Install
If you’re starting from scratch, with a blank microSD card, you’ll want to install Raspbian. If you’ve
already got a working Raspbian system, skip ahead to step 3.
1. Download the NOOBS image. As of this writing, it’s at version 2.4.4.
2. Follow the official installation instructions.
3. Follow the Wiring Pi Instructions to get git, update and upgrade your Rasbpian packages,
then install WiringPi.
Be patient –each of these steps takes a while.
Once you’ve got wiringPi installed, run the gpio commands shown below.
COPY CODE>gpio -v
>gpio readall
It should respond with some information about the wiringPi version and the Pi that its running on,
then draw a table illustrating the configuration for the pins in the 40-pin connector.
Configuration
Like the SPI peripheral, I2C is not turned on by default. Again, we can use raspi-config to enable it.
1. Run sudo raspi-config.
2. Use the down arrow to select 5 Interfacing Options
3. Arrow down to P5 I2C.
4. Select yes when it asks you to enable I2C
5. Select OK and then Finish
Once you return to terminal, enter this command
COPY CODE>ls /dev/*i2c*
The Pi should respond with
COPY CODE/dev/i2c-1
Which represents the user-mode I2C interface.
