5Pcs KY-040 Rotary Encoder Module with 15×16.5 mm with Knob Cap for Arduino (Pack of 5) CYT1062

Very good product for the price point. Knobs are good quality and fit the encoder well. With the threaded shaft, the encoder has panel mount capabilities. All hardware was included and everything works fine. Soldering on the board is good, and I don't expect to have any issues with these. I have implemented 2 of these into my design with no issues. Plus I have 3 more for my next project.

Checked all 5 on the scope. They all worked reliably down to 1.2V. (The product description says 5V), my projects usually run at 3.3V or 2.2V for NiMH battery powered. There is no ringing or glitching on the Clock, Data, or Button Data signals. (No need to de-bounce or worry about false data). My Fluke couldn't read any idle current, so it is less than 10uA. All lines are normally high. Pressing the button does not change the Clock or Data lines. Data is valid on Falling or Rising edge of the clock. Although, the data line is stable for a longer period of time when using the falling edge of the clock. There is one clock pule per indent on the shaft. Turning Clock-Wise. and using the falling edge, data is high. Turning Counter Clock-Wise. and using the falling edge, data is low. (Data level is reversed if you are using the rising edge of the clock. So, this is perfect for any project running from 2.2V to 5V. I am exceptionally happy with this product!

I've been testing these now for a few days on my bench and they seem reliable. The action is smooth, with reasonably noticeable detent points. There are two steps per detent in the output. Markings on the pins are CLK, D0, SW, VCC, GND. CLK and D0 are the A and B pins. The switch is active low as delivered. The knob is ok, though it is only a press-fit. The pic is a little deceiving in that the end of the pot makes it look like a really high quality knob but the sides are the same plastic you get on most knobs. Taking one star for the knob quality.

nice encoders. They have the pull-up or down resistors on the board. The connector is a .1 inch (2.54mm) pitch so will fit cables or will plug into a socket on a PCB. They come with a knob and a knut for the encoder shaft. The knob has a flat on one side that matches the one on the shaft and fits tight. Ther is no grub screw or hole for one. I am not too sure how well that would last with heavy use, seems fragile to me. However, in my opinion, they are a very good value for the money. James Cullins

Was having hours of frustrations using analog potentiometers and other rotary encoder dials that were NOT soldered to a board like this one. Problems gone, results are spot-on accurate! Wish this was my first choice, would have saved dozens of hours.