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Nuts & Volts Magazine (March 2018)

Build an Analog-Style LED Clock — Part 1

By Robert Gill    View In Digital Edition  

Driving LEDs using the lowest possible pin-count is a common challenge for folks creating projects with microcontrollers. Complementary LED drive, also known as “Charlieplexing”, allows a large number of LEDs to be controlled with a relatively small number of I/O pins. This fun digital LED clock project is a hands-on example of how Charlieplexing can be used to stretch your “pin budget”!


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