DIY draw-wire position sensor

A draw-wire position sensor that uses a rotary encoder to count the distance and a tape measure spring for retraction.
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updated November 5, 2022

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A draw-wire position sensor that uses a rotary encoder to count the draw distance and a tape measure spring for retraction of the wire/string.

I couldn't find a model for a draw-wire position sensor so I created one.

This one has dimensions suitable for around 4000 mm of string.

Here is a sample video of the string being retracted 

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