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Why are four states needed with Quadratuer encoders?
I did a search and I couldn't find an answer to this.
First of all I want to know if my idea of how these things work is right. For each Quadratuer encored there are two digitial pins used set as inputs. So each pin can be 1 or 0 which means there are four possible combinations right? To me a wheel can have three states: forward, backward, and at rest. So what is the forth combination used for? Or is it used at all!
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