Enable I2C Interface(Important)

Here we are using the Raspberry Pi’s I2C interfaces, but by default they are disabled, so we need to enable them first.

  1. Input the following command:

    sudo raspi-config
  2. Choose Interfacing Options by press the down arrow key on your keyboard, then press the Enter key.

  3. Then I2C.

  4. Use the arrow keys on the keyboard to select <Yes> -> <OK> to complete the setup of the I2C.

  5. After you select <Finish>, a pop-up will remind you that you need to reboot for the settings to take effect, select <Yes>.