Hello All. I am trying to make make a digital measurement tape (Round type which retracts back once pulled out and let go). So, as the tape or thread is pulled out, the distance sensor should be able to detect how much length has been pulled out. I had a hall sensor and a few magnets in mind. But with this I believe I cannot achieve the kind of accuracy that I'm looking for. I am looking for an accuracy of 1 mm and be able to measure from 0.1 cm (or at-least 1 cm)to 3 meters. Can anyone please suggest any sensor ? What type of sensor would be suitable for this kind of application and accuracy ?
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