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Showing content from https://learn.sparkfun.com/tutorials/qwiic-phat-for-raspberry-pi-hookup-guide below:

Qwiic pHAT for Raspberry Pi Hookup Guide

This Qwiic pHAT [v2.0 and v1.0] for Raspberry Pi is based on the Qwiic Hat. The board is the quickest and easiest way to utilize SparkFun's Qwiic ecosystem while still using that Raspberry Pi that you've come to know and love. This Qwiic pHAT connects the I²C bus (GND, 3.3V, SDA, and SCL) on your Raspberry Pi to an array of Qwiic connectors. Since the Qwiic system allows for daisy chaining (as long as your devices are on different addresses), you can stack as many sensors as you'd like to create a tower of sensing power!

The SparkFun Qwiic pHAT for Raspberry Pi is the quickest and easiest way to make your way into the Qwiic ecosystem and still …

Click on the video's full screen button for a closer view.

To follow along with this tutorial, you will need the following materials. You may not need everything though depending on what you have. Add it to your cart, read through the guide, and adjust the cart as necessary.

You will need Raspberry Pi with 2x20 male headers installed. For those that are using an enclosure with the Raspberry Pi, you'll want to get two rows of 1x20 stackable headers in order to help extend the pins outside of the enclosure.

The Raspberry Pi 3 B+ is here to provide you with the same Pi as before, but now with gigabit and PoE capable Ethernet!

A Pi Zero W will also work but you will need to make sure to solder some male headers to it.

This 2x20 male header has the same number and spacing of pins as a Raspberry Pi but is best served when used in conjunction w…

The Raspberry Pi Zero W is still the Pi you know and love, but at a largely reduced size of only 65mm long by 30mm wide and s…

Or you could stack it on any single board computer (like the NVIDIA Jetson Nano) that utilizes the 40-pin Raspberry Pi header footprint.

The NVIDIA® Jetson Nano™ Developer Kit delivers the performance to run modern AI workloads at a small form factor, low pow…

Machine learning development board from Google.

Now you probably didn't buy the Qwiic pHAT if you didn't have any Qwiic products to use with it, right? If you don't have any Qwiic products, the following might not be a bad place to start.

The SparkFun Qwiic Adapter provides the perfect means to make any old I²C board into a Qwiic enabled board.

Finally, you'll need our handy Qwiic cables to easily connect sensors to your Qwiic pHAT. Below are a few options.

This is a 100mm long 4-conductor cable with 1mm JST termination. It’s designed to connect Qwiic enabled components together…

This is a 50mm long 4-conductor cable with 1mm JST termination. It’s designed to connect Qwiic enabled components together …

This is a 200mm long 4-conductor cable with 1mm JST termination. It’s designed to connect Qwiic enabled components together…

This is a 500mm long 4-conductor cable with 1mm JST termination. It’s designed to connect Qwiic enabled components together…

As a desktop, these devices are required:

• USB Mouse
• USB Keyboard
• HDMI monitor/TV/adapted VGA
• 5V Power Supply

If you aren't familiar with the Qwiic system, we recommend reading here for an overview.

We would also recommend taking a look at the following tutorials if you aren't familiar with them.

An introduction to I2C, one of the main embedded communications protocols in use today.

This tutorial will show you how to communicate with your serial devices using a variety of terminal emulator applications.

There are two pHAT versions out in the wild! Overall, they function the same to Qwiic-ly connect your I²C devices to your single board computer. However, there are small differences between the two boards. Click on one of the images below to explore the hardware for your respective Qwiic pHAT.

The Qwiic pHAT has 4x Qwiic connect ports, all on the same I²C bus. There are two vertical Qwiic connectors located at the center and two horizontal connectors on the right side.

If you need to power a device with 5V, we have broken out the Raspberry Pi's 5V and GND pins on the side with a screw terminal. Depending on your project, you can also solder to the PTH pads.

Included on the board is a general purpose button connected to GPIO17. You can use the button however you would like but we found it useful to shutdown or reboot a Raspberry Pi with a Python script.

There are built-in pull-up resistors on board. If necessary, you can cut the traces to disable depending on the number of boards connected to the I²C bus.

The board is about 65.00mm x 30.50mm. There are six mounting holes on the board. Two pairs of mounting holes were optimized to easily mount Qwiic devices that have the standard 1.0"x1.0" sized board.

The Qwiic pHAT has 4x Qwiic connect ports, all on the same I²C bus. A 3.3V regulator is included to regulate voltage down for any Qwiic boards connected.

There are built-in pull-up resistors on board. If necessary, you can cut the traces to disable depending on the number of boards connected to the I²C bus.

The board is about 65.00mm x 30.50mm. There are six mounting holes on the board.

To get started with your Qwiic pHAT, simply plug it into the headers on the Raspberry Pi with the letters facing you. We'll use the Qwiic pHAT v1.0 in the following images to connect a Qwiic device.

Once the pHAT is plugged in, you can start plugging in any Qwiic enabled sensors.

The Qwiic pHat is also compatible with single board computers (like the

or the

) that utilize the 40-pin Raspberry Pi header footprint. Below are images of v2.0 and v1.0 stacked on the different single board computers.

Depending on your project, you can mount a qwiic enabled board on the mounting holes using standoffs. Below are two images showing Qwiic devices mounted on each version of the Qwiic pHAT.

When placing a Raspberry Pi and the pHat in an enclosure (like the Pi Tin), we noticed that the pHAT was not fully inserted in Pi's header pins. You will need an additional pair of stackable headers for a secure connection depending on your enclosure. Otherwise, the original Qwiic HAT would be better if you need to using the boards in an enclosure.

We recommend checking out the Raspberry Pi 4 Hookup Guide to install the operating system to flash the image to your microSD card for detailed instructions.

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 the next section. Be patient — each of these steps can take a while depending on the speed of your microSD card.

1. Download an Image — Download your favorite Linux distribution. For beginners, we recommend getting NOOBS image.
2. Flashing the Image — Follow the instructions from the Raspberry Pi 4 Kit Hookup Guide to flash your microSD card. You can also follow the official Raspberry Pi installation instructions.

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.

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

Click on image for a closer view.

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.

Click on image for a closer view.

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.

Click on images for a closer view.

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.

Raspi-config for I2C

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.

The best place to start would be to scan for an I²C device on the bus.

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:

language:bash
ls /dev/*i2c*

The Pi should respond with:

language:bash
/dev/i2c-1

Which represents the user-mode I2C interface.

There is a set of command-line utility programs that can help get an I²C interface working. You can get them with the apt package manager. Enter the following command.

language:bash
sudo apt-get install -y i2c-tools

In particular, the i2cdetect program will probe all the addresses on a bus, and report whether any devices are present. Enter the following command in the command line. The -y flag will disable interactive mode so that you do not have to wait for confirmation. The 1 indicates that we are scanning for I²C devices on I²C bus 1 (e.g. i2c-1).

language:bash
i2cdetect -y 1

You will get an output from your Raspberry Pi similar to the output below.

language:bash
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: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: 60 -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --

This map indicates that there is a peripheral at address 0x60. Your address may vary depending on what is connected to the I²C bus. For advanced users, you can try to read and write its registers using the i2cget, i2cset and i2cdump commands.

For more information, check out the resources below:

• Qwiic pHAT V2.0
  • Schematic (PDF)
  • Eagle Files (ZIP)
  • Board Dimensions (PNG)
  • GitHub Repo
  • SFE Product Showcase
• Qwiic pHAT V1.0
  • Schematic (PDF)
  • Eagle Files (ZIP)
  • Board Dimensions (PNG)
  • GitHub Repo
  • SFE Product Showcase

Now that you have your Qwiic pHAT ready to go, it's time to check out some of Qwiic enabled products.

The SparkFun RFID Qwiic Reader is a simple I2C based RFID breakout board for the ID-3LA, ID-12LA, and ID-20LA readers.

If you already have a handful of SparkFun sensors and parts? SparkFun has been putting our standard GND/VCC/SDA/SCL pinout on all our I²C boards for many years. This makes it possible to attach a Qwiic Adapter that will get your SparkFun I²C sensor or actuator onto the Qwiic system.

Here is the list of the boards that have the standard I²C pinout and will work with the Qwiic adapter board:

• 9DoF Stick IMU - LSM9DS1
• 9DoF IMU - MPU-9250
• 6DoF IMU - LSM303C
• 6DoF IMU - LSM6DS3
• Triple Axis Accelerometer - LIS3DH
• Triple Axis Magnetometer - MAG3110
• Triple Axis Magnetometer - MLX90393
• Compass Module - HMC6343
• Atmospheric Sensor - BME280
• Barometric Pressure Sensor - MS5803-14BA
• Barometric Pressure Sensor - T5403
• Humidity and Temperature Sensor - Si7021
• Digital Temperature Sensor - TMP102
• Particle Sensor - MAX30105
• Air Quality Sensor - CCS811
• ToF Range Finder - VL6180
• Haptic Motor Driver - DRV2605L
• Micro OLED Display
• RGB and Gesture Sensor - APDS-9960
• RGB Light Sensor - ISL29125
• LED Driver - LP55231
• DAC Breakout - MCP4725
• 16 Output I/O Expander - SX1509
• Battery Babysitter - BQ24075

Looking for inspiration? Check out this related tutorials to use I²C devices on a Raspberry Pi:

Or try taking advantage of the general purpose button on the Qwiic pHAT v2.0!

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