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I've now worn out two of these in a matter of a few weeks. They work just fine to start, but then the contacts seem to go bad and I start getting spots in the rotation where the phase of the signals changes such that the software reports they've stepped in the opposite direction. Starts with one spot, then gets worse with age. These are being used in a scroll wheel on my desktop (software emulates the middle scroll wheel on a mouse). Will be scrolling down a page, and then in the same spot in the rotation every time, will jump in the opposite direction. This is consistent. If I replace it with another one, it works fine.
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!
So, these little encoders are exactly what I needed and such a great price. Shipping was fast as always and items arrived a day ahead of schedule. Additionally, reading other reviews here on Amazon, I had expected to have to find a source for the retaining nuts, but I was pleasantly surprised to find a small bag with 5 washers and nuts included with the encoders. Perfect! The knobs that come with seem a bit small at first, but they will fit. Not sure why they have pointer on them, as these are continuous rotation encoders, but can't they look nice so can't complain.
Overall the encoder looks well built, has firms detents and is a good value but it was not well suited to my application in a uBitx ham radio kit. I had to replace the original encoder and this one is not a good match. The detents covers 2 or more pulses per detent and makes setting the frequency nearly impossible as the steps are too large. I opened one up and removed the fixed detent spring and it works much better, however is has more pulses per revolution than the original still making a setting more precise than needed. My mistake not the 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.
Not sure if the issue is the fact that the rotary encoder has resistors installed already, but the rotation is not correctly registered when using it. I did try a different product bought on a different store, that is just the rotary encoder at 4 pulse per revolution and they work fine; while this one does not.
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
It's a really good device, works as expected. It's logic is pretty simple: when CLK signal falls down, check the state of DT: if it's also "0" (zero) then it's a clock-wise rotation, if it's "1" - you're rotating counter-clock-wise. And of course you need some logic for de-bouncing.
I like that you can turn AND use them as buttons. EASY TO HOOK UP AND PROGRAM, especially with Arduino.
Comments I've had from others, though, have been that the caps had a mark on them, but they are ROTARY ENCODERS - they continue to turn, so the mark on them starts to seem unneeded. If they were potentiometers with limits, it would make more sense. Because these don't stop, I had to program them to recognize when they hit the limit, even if it spins around multiple times.