The SparkFun Qwiic GPIO is an I2C device aimed at simplifying adding extra GPIO pins to a microcontroller. The board uses the TCA9534U I/O Expander IC from Texas Instruments to add up to 8 digital inputs and outputs controlled via an I2C interface. The TCA9534U features three address select pins that can be set to configure eight unique addresses meaning you can have up to 64 I/O pins controlled from a single I2C bus!
The Qwiic GPIO, based on the TCA9534 I/O Expander IC adds an additional 8 IO pins which you can read and write just like any …
To simplify wiring everything up, we've broken out all eight of the general-purpose I/O pins on the TCA9534U along with several power rail pins to latch terminals and, as you would expect from a Qwiic board, the I2C interface is broken out to a pair of Qwiic connectors.
Controlling the TCA9534 is relatively straightforward but to make things even easier, we've written an Arduino Library and a Python Package for the Qwiic GPIO to make writing code for it as easy as possible.
In this guide we'll go over everything you need to know about the Qwiic GPIO so you can add those extra I/O pins to your circuit with ease!
In order to follow along with this tutorial you'll need a few items along with your Qwiic GPIO. First, you'll need a microcontroller to communicate with the board. Below are a few options that come Qwiic-enabled out of the box:
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The SparkFun RedBoard Qwiic is an Arduino-compatible development board with a built in Qwiic connector, eliminating the need …
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If your preferred microcontroller does not have a Qwiic connector, you can add one using one of the following products:
The SparkFun Qwiic Adapter provides the perfect means to make any old I2C board into a Qwiic enabled board.
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 Thing Plus makes it so you can use SparkFun's Qwiic connect ecosystem with development boards t…
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The SparkFun Qwiic Shield for Arduino Nano makes it so you can use SparkFun's Qwiic connect ecosystem with development boards…
Finally, you'll need at least one Qwiic cable and possibly some hook up wire or jumper cables. Below are a few options for each of those cable types:
This is a 100mm long 4-conductor cable with 1mm JST termination. It’s designed to connect Qwiic enabled components together…
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This is a 200mm long 4-conductor cable with 1mm JST termination. It’s designed to connect Qwiic enabled components together…
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 the concepts covered in them:
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