I feel bad for the people who uses this "arduino beginners guide" : r/electronics
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What is the solution for this problem? How do I connect a 64 LED with an Arduino Uno R3? The Arduino has only 13 pins for a digital I/o.' - Quora
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nano pin 13 out - Programming Questions - Arduino Forum
Bad Tutorial? Connect an LED directly to pin 13 without resistor? - Website and Forum - Arduino Forum
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