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Library for the Adafruit alphanumeric featherwing

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Thanks to Samuel for sending this in! Check out more here.

Library for the Adafruit alphanumeric backpack (using the HT16K33 chip)

I was putting together a project using 4 Adafruit featherwing LED backpacks (Adafruit product id 3130). That would give me a 16 character display. I would be using 4 i2c addresses, and wanted to hide the details of the i/o from my main sketch. Thus I thought I would build a library to handle the job. I used some of the code from the Adafruit libries, and wrote the rest. My library goes into a folder called AlphaDisp within the libraries folder.

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