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USB Volume Control and Caps Lock LED - Simple, Cheap, Extensible : 8 Steps (with Pictures) - Instructables
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Amazon.com: Cylewet 5Pcs KY-040 Rotary Encoder Module with 15×16.5 mm with Knob Cap for Arduino (Pack of 5) CYT1062 : Industrial & Scientific
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USB Volume Control and Caps Lock LED - Simple, Cheap, Extensible : 8 Steps (with Pictures) - Instructables
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