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Originally Posted by Issues
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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you are looking at the input to the encoder. The two signals are needed so the encoder can determine which way it is moving, as well as how fast its moving.
It gets better. The encoder also remembers the previous level of those two signals. Based on how they change it can then determine which way its rotating.
The output of the encoder is not really a set of states, its a vector speed (signed variable), or for some, a vector distance, clocked out at fixed intervals..
look at an actual encoder disk, think about what happens as it rotates, and it will make more sense to you.