Adafruit has made an I2C interface for four rotary encoders. It comes in the form of a PCB with four footprints that accept one of the most common rotary encoder forms (Bournes PEC11 horizontal style) ...
If you are interested in building your very own programmable keypad complete with an encoder wheel for video editing, you may be interested in a new project published to Github for the EncoderPad ...
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