If you want to build a button array, follow this diagram. The main idea here is to connect each button to a diode in a row by column fashion, and read all the rows column by column. Rows works as ...
Arduino Library for the charlieplexed 8x7 LED Array. To use the LED array with any ATmega 168 or 328-based Arduino, see the SparkFun LED Array (8x7) Hookup Guide. A version of the LED array (called ...
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