Capacitive Position Sensor

This is the analog method of using a varable capacitor to detect position.

Most basic, is two overlapping plates to detect position changes. I've seen these DIY'ed as laser galvanometer feedback.

A different method is used for incremental encoder feedback (find and attach picture).

I'm wanting to see if we can make a printed linear capacitive encoder with an absolute or semi-absolute track so we don't have to home it.

I'm wanting to use an MCU with a highly integrated capacitance measurement system to create a smart linear sensor that can be easily produced for DIY CNC and Repraps.

Capacitive Reference Book in local libraries

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