Qwiic pHAT Extension for Raspberry Pi 400 Hookup Guide

Contributors: bboyho, Elias The Sparkiest

Configuring the Pi

The peripherals are not turned on by default. For those using Qwiic-enabled devices, you will want to enable I2C port. There are two methods to adjust the settings. This is outlined in our Raspberry Pi I2C tutorial.

We've included the following instructions from the tutorial. To enable it, follow the steps below.

Raspberry Pi Configuration via Desktop GUI

You can use the Desktop GUI by heading to the Pi Start Menu > Preferences > Raspberry Pi Configuration.

A window will pop up with different tabs to adjust settings. What we are interested is the Interfaces tab. Click on the tab and select Enable for I2C. At this point, you can enable additional interfaces depending on your project needs. Click on the OK button to same.

We recommend restarting your Pi to ensure that the changes to take effect. Click on the Pi Start Menu > Preferences > Shutdown. Since we just need to restart, click on the Restart button.

Shutdown	Turn Off, Restart, Log Off

raspi-config Tool via Terminal

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. Also select yes if it asks about automatically loading the kernel module.
6. Use the right arrow to select the <Finish> button.
7. Select yes when it asks to reboot.

The system will reboot. When it comes back up, log in and enter the following command

language:bash
ls /dev/*i2c*

The Pi should respond with

language:bash
/dev/i2c-1

Which represents the user-mode I2C interface.