I came here just to figure out how to hook up a Rotary Encoder, but I got so much more! Thank you for this excellent tutorial!

This is still by far the best code for handling rotary encoders that are a little noisy. This code works flawlessly every time I use it. Thanks for sharing and posting this video.

Thanks for this video. I've been concentrating on becoming more fluent with encoders and steppers lately, and you've explained somethings that I haven't run across before. This is a very clear, concise and informational video. You have gained a subscriber 🙂

Whoever worked out the coding for increasing and decreasing is a genius

I know this is a little late in the game, but I thought this may help someone. I loaded your code onto an ESP32 DevKit1C. Used pin 14 as A and 15 as B. Worked well except that: (1) the first turn of the knob did not register (counter did not change) and (2) after any change of direction, the first turn did not register. The code I downloaded from github has a few "static" declarations under the "read_encoder" function. The first is: "static uint8_t old_AB = 3; // Lookup table index 3". I changed "uint8_t old_AB = 3" to "uint8_t old_AB = 4" and the problem on my ESP32 is now solved. To the author. Thank you so much for a great piece of code. Brilliant!

thank you sir,Your video is the clearest one to explain the encoder state machine(the lookup table)，I modified the code a little bit,When a tick check failed because of a large number of noise.Assume the enc value has been added to 2. If next turn direction was CCW,the enc value would be changed like 2-->1-->0-->-1,The counter value won't change even enc value changed 4 times,Your code clears the enc value to zero only when it>3 or

Great! You explained everything in detail. Thanks so much

Thanks for sharing the information! ❤ Really helpful for my project I’m working on at the moment

I thought I had a pot, but instead I had a rotary encoder! You have unblocked my project with this helpful video. :) Thanks

Hi Mo...that code is very responsive and reliable. I may need to adjust the multiplier value for the fast rotation, but that should be straightforward. I plan on using this as part of a precision AC current Trip. I'm using a Current Transformer to sense the current, which drives a Precision Rectifier and a comparator. I'm using an MCP4725 12-Bit DAC to set the reference for the Comparator. The falling-edge of the comparator output, triggers a D-FF which drives a DPDT relay to isolate the supply being monitored. Keep up the good work and thank you.

Excellent video Sir, very well explained, a real pleasure to watch. I will use your code for a stepper motor driven indexing head. However there is a tiny flaw: If you turn the knob really fast, you may end in a state where encval is +2 / -2 in the rest position and you need two clicks backward/forward to decrease/increase the counter by one. Just set old_AB = 3 after abs(encval) >= 4 to get bullet proof code 🙂

Very helpful, I nearly gave up on my encoder but this works remarkably well. I need an position on a positional axis and previous designs struggled with all kinds of misreading's. Thank you for a very good explanation aswell.

It works flawlessly. I tried different codes but they didn't work properly. Your code works perfect. Thanks :)

Great video, and very clear instructions. 😊

Excellent video as always!

I have a bunch of different encoders I am using to build a flight sim avionics panel. I was using some button box code I found on the internet, and the encoders were not behaving as expected. Specifically some of them only triggered every second click. Testing the encoders as you detail here, I found that some of them don't behave as the one in your example. A and B both alternate low,high,low... for subsequents rest positions. So using your LED test, at the rest positions, the lights go on,off,on... not just off. So I have a mixture of encoder types, X2 and X1 or X4, not sure which. Now I need to figure out how to adapt this code to cater for the different types. Be useful if these types were mentioned in this video. Great video, I am new to this stuff and your video was the most comprehensive explanation I have found for a newbie like me.

Very inormative video! Thanks, you didnt miss a thing

Any suggestions for how to convert the values this code puts out into degrees?

This is the only code that worked perfectly. All others I found on the internet for me only worked 80% correctly...

Great explanation

is there a way to use the rotary encoder without the interrupt pins? or can the inputs be polled instead?

Interesting, I have a large rotary encoder on small PCB with 5 pins and with the LED test it behaves exactly as the one in this video. However, one of the mouse scroll wheel rotary encoders (Huano S-10 from Amazon) LED 1 lights up, then LED 2 (both are now lit), and then they both go out at the same time. In the other direction it's like: both are lit, LED 2 goes out, LED 1 goes out. Weird. I wonder if I can modify this code to work with this particular rotary encoder, as I am trying to save space in my project and not use one of the larger encoders.

I dunno what to do! Im just using a rotary with the atmega328p chip, and then I make the pull up resistor circuit + filters but the values still bounce any time.

I've been trying to figure out what kind of switch my cycle selctor is on my GE front load washer. It doesn't look like a rotory switch. It's soldered to the board, mine had cold solder joints and separated from the board. The switch looks like one of these. It has 2 bigger pins holding it on, not sure if they do anything because I don't see they are in a circuit line. Theb there a 4 smaller pins off to the side. It has those clicks as you turn it.

Just wondering, maybe it's clearly stated and I'm just not getting it right now: What happens, if the user would change the direction mid-click? As in after 2 Statechanges he returns back to the starting point instead of completing the click? Thank you for the nice work, it helps a lot!

Thank you so much for the video, the nice explanation and the code! :) This has solved my problem (having much of the mentioned noise in my signals) in one of my projects - I'm really grateful for that. :) Is there a way to do it without interrupts as well? - I'm planning to make another project in which I'd like to use 4 rotary encoders with an Arduino Pro Micro (having only 5 pins with interrupts support).

Awesome video.

Hey, i’m trying to make a steering wheel for racing games , can i do this and have it work in racing games?

So, may I ask please, everyone does the rotary encoder and an Arduino uno. Could you please do a sketch using the encoder with isr and an Arduino nano EVERY the one that uses the ATMega 4809, I have not found one YT video using this MCU with an Encoder and for us normal none program savvy people this is really hard to try and figure out how it works from the 600 page MCU manual. Thank you.

is there a way to do this with multiple encoders even though only pins 2 and 3 support interrupts?

Idk if this is just with me, but if i turn the encoder in one direction, then in the other, it first increments and then starts decrementing the value. So it is like this: turn right: 1,2,3,4,5 turn left: 6,5,4,3,2,1

Can KY-040 work without VCC connected?

So amazing. It almost feels like applying AI to a rotary encoder, and it works so well. Big thanks, and Jesus loves you.

Great video, very explicit, thanks for your efforts.. Subscribed.!!

that's excellent

excelente gracias

mine prints only ???????????, no numbers. must be broken...

You save my time, thanks from Ukraine

your video is a little bit to quiet i have trouble hearing you even at max volume with my laptop

Thank you for making this video! I appreciate the time you put into it and the professional graphics. Very well done. I am building an Omni wheel platform and my coding skill level certainly needs a boost. Eventually I will put together enough good examples to succeed with my project. I am doing this in support of my omnidirectional standing wheelchair project, to perfect the steering. That project has Roboclaw motor controllers that eliminate the need for the basic coding to support its encoders. I am a rookie and it took me a huge chunk of time to incorporate encoders. In the future I want to use affordable motor controllers and use the sketch to do the encoder translation. HTTPS://kzfaq.info/get/bejne/q8CIm9uFv6rVpaeI.html. I’d like not to be a rookie forever.

man your audio is low. Why do so many YT's spend so much on video and then have low volume? Hard to listen to

tarsh

The mic is so bad, great informative video but the mic is extremly quiet... if I would play a song now it would blow out my hifi speakers. It's actually half the volume than other videos on youtube

Love this guys videos !! #1 subs provider -> Promo'SM!!