Talk:CEB Press/Manufacturing Instructions/Controller Box/Arduino Control of CEB Prototype 2

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Have you guys considered a couple of inductive linear encoders?

They aren't too difficult to build from scratch, and I think an Arduino could easily run two of them, as well as the solenoids.

Edit: Hackaday just linked to a homebrew project to build just such a sensor, from which I now know that the name I was searching for is "Linear Variable Differential Transformer." Enjoy!