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HariFun #143 - How to read a 4x4 keypad using just one Arduino pin!
Published on Thu, Oct 6th 2016 Science & Technology Rectangular HD
Mega Sudoku Playlist: https://youtu.be/x02x4QGhyDg?list=PL-xZsBalytNCMYOMs5Rapy0HT1WHgDoek
More info at https://hackaday.io/project/13073-seven-segment-sudoku
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