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[mcp23017] Added hint to the wiringPi library #4806

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[mcp23017] Added hint to the wiringPi library #4806

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6 changes: 5 additions & 1 deletion addons/binding/org.openhab.binding.mcp23017/README.md
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# MCP23017 Binding

This binding allows you to have native access for MCP23017 I/O expander on I2C bus.
It was tested with Raspberry PI 2 and Raspberry PI 3, but probably should work with other devices supported by pi4j library.
It was tested with Raspberry PI 2 and Raspberry PI 3, but probably should work with other devices supported by [pi4j](http://pi4j.com/) library.

On Raspberry PI user on which openHAB is running (default user name is "openhab") needs to be added to groups "i2c" and "gpio".

## Dependencies

Make sure that the [wiringPi](http://wiringpi.com/) library has been installed and that the `gpio` command line tool is available to OpenHAB. The shared library `libwiringPi.so` is required by the pi4j Java library to access the GPIO ports. Without satisfying this dependency you will see strange `NoClassDefFoundError: Could not initialize class ...` errors in the OpenHAB logs.
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Fix spelling of openHAB. Please check the whole documentation.

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Please break down to one line per sentence.


## Supported Things

This binding supports one thing type:
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