Electronic Counter and Quadrature Encoder Reader
The counter can read one or two digital or analog sensors and display the running total on an organic LED display. The counter controls the speed of an attached DC motor and can stop it when a certain count is reached. The project features a continuous rotation rotary encoder dial, with a cut-away view and an explanation of how quadrature encoding works. Finally, there is an in-depth example of why interrupts are better than polling.
   Electronic Counter and Quadrature Encoder Reader
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