Seloky 10pcs Rotary Encoder Module KY-040 for Arduino Compatible Brick Sensor Switch Development Board（With 10 black knobs and Threaded）

Work well, but the quadrature outputs are noisy and need proper de-bouncing. Button output (SW) works well, doesn't seem to need debouncing (but you should always debounce switches, they tend to degrade with age). Encoder outputs are labelled CLK and DT which is odd since they are the A and B quadrature outputs. They should be labelled A and B, LOL. The encoder has 20 detents per rotation and 4 quadrature steps per detent. We can take advantage of this by decoding the 4 steps into one debounced up or down count. I tested 3 encoders and all 3 have the same alignment between output and the detent. At each detent the AB outputs are both high (1,1). My implementation uses AB output 0,0 as a reset, then counts up if it sees 0,1 followed by 1,1 and counts down if it sees 1,0 followed by 1,1. Once 1,1 is seen, counting is disabled until 0,0 is seen. This effectively debounces it and gives one up or down count per detent.

Actually reasonably good quality for the price. I was using them for a Raspberry Pi project and decoding and debouncing them proved to be a challenge. Got it working but eventually went with an optical because I wanted smooth rotation rather than individual stops.

Worked great, fit well. Machined aluminum knobs. Felt nice and seems high quality. Would buy again.

Quick and easy to set up and works exactly as you’d expect. Knobs feel nice, and comes with the washers and nuts you need to attach to projects.

Well put together enconders fast delivery

Too noisy and imprecise for my application ended up using pots instead.