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Showing content from https://learn.sparkfun.com/tutorials/qwiic-shield-for-arduino--photon-hookup-guide below:

Qwiic Shield for Arduino & Photon Hookup Guide

The Qwiic Shield (for Arduino or Particle Photon) is the first step in getting acquainted with SparkFun's Qwiic connect ecosystem. It connects the I²C bus (GND, 3.3V, SDA, and SCL) on your Arduino or Photon board to a series of SparkFun Qwiic connectors. The board already has the circuitry to convert the 5V given to the 3.3V required by I²C boards in our Qwiic ecosystem. The Arduino shield also has holes for mounting Qwiic boards. 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 Shield is an easy-to-assemble board that provides a simple way to incorporate the Qwiic Connect System wit…

The SparkFun Qwiic Shield for Photon is an easy-to-assemble board that provides a simple way to incorporate the Qwiic System …

Here's a quick overview of the Qwiic shield for Arduino. The Qwiic shield for Photon is similar but made for the Particle Photon's footprint.

To follow along with this hookup guide, you will need any Arduino with the R3 header footprint, or a Photon Board. This includes the Uno, RedBoard and many other Arduino compatible boards! Here are just a few of the compatible boards.

This is the new Arduino Uno R3. In addition to all the features of the previous board, the Uno now uses an ATmega16U2 instead…

Particle's IoT (Internet of Things) hardware development board, the Photon, provides everything you need to build a connected…

Now you probably didn't buy the Qwiic shield if you didn't have any Qwiic products to use with it, right? Well, 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 shield. 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…

You will need a soldering iron, solder, and general soldering accessories to solder the header pins to the Qwiic shields.

This is your basic tube of unleaded (Pb-free) solder with a no clean, water soluble resin core. 0.031" gauge and 15 grams

This is a very simple fixed temp, quick heating, 30W 110/120 VAC soldering iron. We really enjoy using the more expensive iro…

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.

An update to our classic Arduino Shields Tutorial! All things Arduino shields. What they are and how to assemble them.

Note: The shield includes R3 Arduino headers, but they are not pre-soldered onto the board, so some assembly will be required when putting the shield together. The image below shows the shield after the header has been soldered to the PCB to.

The Qwiic Shields have 4x Qwiic connect ports, all on the same I²C bus. Logic level converters are included for the Qwiic connect port's SDA and SCL lines so you do not have to worry about using the Qwiic system with 5V (or 3.3V) devices.

In addition to this, a large prototyping area is included. As shown in the image below, the Qwiic shield for Arduino has a few neat features such as a few 3-by-1 rails to help with prototyping.

There are also buses for ground, 5V and 3.3V on the shield for Arduino outlined below.

The headers also allow for every pin on the microcontroller of your choice to still be accessed through the female headers.

Note: The shield includes headers, but they are not pre-soldered onto the board, so some assembly will be required when putting the shield together. The image below shows the shield after the header has been soldered to the PCB to.

The Qwiic shield for the Particle Photon also includes 4x Qwiic connect ports, a prototyping area, and buses for 3.3V and ground. However, they are much smaller. The Photon is a 3.3V system and assumes that you are using 3.3V devices so logic level conversion is not included in the design. If you are using a 5V based I²C device, be sure to grab a bi-directional logic level converter.

To get started with your Qwiic shield, all you'll need to do is solder on headers. For a detailed description of how to do this with Arduino shields, simply check out our Arduino shield tutorial. It'll get you started with attaching those headers to your shield properly. These tips are also useful when installing the headers for the Qwiic shield for Photon.

Once you've attached headers to your Qwiic shield, you're ready to plug it into your Qwiic enabled board of choice. Below is an example of a few Qwiic sensors daisy chained to the Qwiic shield for Arduino. If you need to mount a Qwiic sensor, just grab a few standoffs and screws. Plug in any Qwiic enabled board and get going!

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