What is a rotary encoder? A rotary encoder (RT) is a device that you can rotate infinitely. On most rotary encoders, when you rotate them you will feel a bump (known as steps), and most RTs have about ...

The module has internal pull-up resistors, but the sketch also enables Arduino's internal pull-ups for safety. Either way works. The KY-040 has two quadrature outputs: CLK and DT. As the shaft turns, ...