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KY-040 Rotary Encoder Module
-The rotary encoder can count the number of pulse output during rotation in the positive direction and reverse direction through the rotation and this rotation counts are not limited.
-With the key on the rotary encoder, you can reset to the initial state, that is, counting from 0.
Customer
2025-06-14 14:14:40
The KY-040 is a common rotary encoder. It is clicky, meaning discrete positions versus a smooth range like a potentiometer. It is also a relative encoder, so it cannot give you absolute position. The part from jsarea is robust and well made, though the supplied knobs do not fit very well. Fine with me, as I use them to encode mechanical angles not as knobs anyway. For the software side, be sure to ignore 99% of the examples out there that use this device, as they not only waste CPU cycles but they bounce a lot and miss position changes, especially when your loop is doing anything else as it throws the timing off. Use interrupt driven code (the pins are called CLOCK and DATA for a reason—when the CLK pin rises, simply read the DT pin for direction. Tie CLK to an interruptible GPIO pin and add some simple debouncing to the interrupt handler, and you’ve got rock solid performance. For an example, look for the bestov.io blog.
Spencer
2025-02-10 11:03:10
Encoders are fun for making a knob control a project, or these could be useful to replace a broken knob on a 3d printer for example. They come with the caps to put on the encoders, and so far have worked fine. No complaints here
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