Driving a Single Digit 7 Segment LED Display requires 8 of an Arduino's 20 or so I/O pins. Using a 74HC595 shift register only requires 3.
by Mel Lester Jr
Make a fully-functioning CNC machine that can accept different tools for less than $150 by using parts from DFRobot and Banggood.
Project tutorial by Arduino “having11” Guy
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