Reading a Rotary Encoder from a Raspberry Pi

I wanted to attach a knob to my Raspberry Pi to act as a vol­ume con­trol for my MPD based jukebox. Tra­di­tion­ally vol­ume con­trol devices are imple­mented with poten­tiome­ters act­ing as inputs for ampli­fiers. A poten­tiome­ter is a hard­ware device with a knob or a slider that, in a word allows for a vari­able volt­age …

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