If you are a novice to rotary encoders for human-machine interface, there is a potential pit-fall. Otherwise called quadrature encoders, they deliver two-bit gray-scale binary on rotation, with the phases of the two square-waves at 90° – hence quadrature. Being Gray, it is posible to determine which direction the shaft is being rotated by looking ...
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from Electronics Weekly https://www.electronicsweekly.com/blogs/engineer-in-wonderland/quadrature-encoder-wisdom-2017-09/
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