Yes, several. You may want to Google "String Pot". I have used them accurately out to 10 feet (3.048 meters). You may also want to look at how the wire feed systems work on tig welding where how much wire is fed and at what speed. They count up and down just like a string pot.Is there any such readymade sensor aseembly availble which directly gives some digital/analog signal on how much thread moves in/out.
Take a piece of string and wrap it around the cylinder. Mark off one circumference.
Measure the length of your string with your metal tape measure.
Or finally, take ANY piece of string and wrap it around what you're measuring. Take a marker and put a mark on the two strings as they overlap. Then straighten them out and measure that distance.
Well then with that uncertainty the cost just went up. String pots I used had a stainless steel wire. Still have an old 8' one. Unimeasure makes great stuff which includes a matching price tag. I agree, you can have accuracy and resolution but it doesn't come cheap (inexpensive).In post #1 there was a requirement of accuracy within one millimeter, about 0.024 inches. A string will usually stretch more than that, and a cloth measuring tape can not be read that closely. THAT is why I suggested the stringpot with the encoder option.
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