That’s the idea behind this Arduino-based measuring jig for fabricating parts for a CNC build. When it comes to building on the cheap, nobody holds a candle to [HomoFaciens].

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) ...