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README.md

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SparkFun I2C Expander Library
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[![SparkFun RGB Sensor - BH1749NUC (SPX-14733)](https://cdn.sparkfun.com//assets/parts/1/2/9/6/0/14733-RGB_Sensor__Qwiic__-_BH1749NUC-01.jpg)](https://www.sparkfun.com/products/14733)
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[*SparkFun RGB Sensor - BH1749NUC (SPX-14733)*](https://www.sparkfun.com/products/14733)
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The SparkFun I2C Expander Library supports 4-bit and 8-bit I2C digital I/O expanders. These expanders can read or write four or eight separate I/O.
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This library handles the initialization of the PCA95xx and supports standard `pinMode`, `digitalRead`, and `digitalWrite` functions.
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<table class="table table-hover table-striped table-bordered">
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<tr align="center">
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<td><a href="https://www.sparkfun.com/products/26784"><img src="https://cdn.sparkfun.com/r/455-455/assets/parts/2/7/8/6/7/PRT-26784-Qwiic-Power-Switch-Feature.jpg"></a></td>
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<td><a href="https://www.sparkfun.com/products/17047"><img src="https://cdn.sparkfun.com/r/455-455/assets/parts/1/5/9/9/3/17047-SparkFun_Qwiic_GPIO-01.jpg"></a></td>
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</tr>
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<tr align="center">
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<td><a href="https://www.sparkfun.com/products/26784">SparkFun Qwiic Power Switch (PRT-26784)</a></td>
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<td><a href="https://www.sparkfun.com/products/17047">SparkFun Qwiic GPIO (DEV-17047)</a></td>
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</tr>
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<tr align="center">
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<td><a href="https://www.sparkfun.com/products/14733"><img src="https://cdn.sparkfun.com/r/455-455/assets/parts/1/2/9/6/0/14733-RGB_Sensor__Qwiic__-_BH1749NUC-01.jpg"></a></td>
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</tr>
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<tr align="center">
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<td><a href="https://www.sparkfun.com/products/14733">SparkFun RGB Sensor - BH1749NUC (SPX-14733)</a></td>
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</tr>
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</table>
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The **SparkFun I2C Expander Library** makes working with 4-bit and 8-bit I2C digital I/O expanders very easy. These expanders can read or write four or eight separate I/O.
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The following ICs are supported:
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* PCA9534/TCA9534
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* PCA9536/TCA9536
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* PCA9537/TCA9537
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* PCA9554/TCA9554
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* PCA9556/TCA9556
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* PCA9557/TCA9557
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* And maybe others...
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This library supports using alternate Wire ports (ie, Wire1, etc) as well as alternate I2C addresses and includes support for interrupt pin errata (PCA9554).
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This library supports standard `pinMode`, `digitalRead`, and `digitalWrite` functions.
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Repository Contents
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