DIY FFB Steering wheel (MMosFFB ) (In Progress)

My friends G27 broke few years ago and there was plastic encoder disc broke
https://www.ebay.com/itm/274456304383?hash=item3fe6dedaff:g:u~QAAOSwPSBfMvOt
Maybe this is your problem too.

Hi, sorry for my bad english but i have the next problem, and i need some ideas and some help. I have an arduino leo with the EMC firmware and i plug it (with the same wirings that are at they page) an hn3806-ab-600N encoder. The problem is that when i spin the encoder clockwise, the EMC soft turn the wheel clockwise (eg. 10 degrees), but when i spin the encoder the same distance bue anti clockwise, the EMC soft almost doesn't turn (eg. 2 degrees). So the steering wheel lost the center, lost the alignament. Anyone have some clue? the same wiring with the FFB soft works fine

Been working on a DIY FFV Wheel with an Arduino and a Omron E6B2 1000ppr Encoder (Chinease Import). But I have been struggling to get a signal out of the endoder, I have verified the arduino and the software works using a cheap ~20 ppr encoder (the ones with the click button). I have tried with and without resistors (1k & 4.7K), with the Omron.

Does anyone have any ideas on what I should try next?

Hey I read you can use STM32 or Arduino Leonardo. Is there any advantage for the stm32? Its roughly double the price, but its not so much money anyway. Since I have neither, which should I get?

Hi there! How are they? I tell you that I was able to finish the steering wheel, the truth works perfectly. but I have a problem in assetto corsa, that's why I write to you. In the test sessions, the feedback is not working properly for me, the steering only gets heavy when the car is not rolling, the track, piano and off-track effects do not work, and neither does the gain. I already tried with the configuration of the feedback of the game and it does not solve it. Can you think of what could be the downside? I assembled it with arduino leonardo.

then I upload the photos with the latest version.

Thank you.

Ditch the Leonardo and get an f401 board, then use emc developments firmware. You will not be disappointed. Yes, it costs a few euro but WELL worth it over mmos etc and is in active development.

Hi there! I have a problem with my encoder (from Canon IP2700). It worked for a while but it stopped working, I can see that the red LED inside is on, but the Arduino Leonardo is not receiving the signal from it. What can i do?

Hello!
Just finished rebuilding my Thrustmaster RGT using stm32 board running Mmos coupled with bts7960 powering new 24v/360w DC motor and it all works for most part. I am struggling to get ffb working properly. Overall it do works, I have end stops and some effects but they seem to be most noticeable when at max angle. When near 0° angle there is literally nothing except high spikes when crashed or so, sometimes they came stupidly strong out of nowhere like when testing on F1 2020 where on fast straight no ffb and when slightly turning wheel it literally fight me. From information I gathered here in previous posts, it may be a problem with how bts is wired or mmos setting. Using pwm/dir mode, the BTS is wired like this: pe9 (pwm) on both EN inputs, pe10 (dir1) on RPWM, pe11 (dir2) on LPWM. Idk how to propresly setup mmos config. I ill be gald for any idea how to make it wok proprely. Also what about EMC? Is that better/worse, any issues with BTS modules?

Don't use pwm dir.
Pwm h-bridge instead. And look carefully how all is connected in schematics.

I did try it previously, but not tested in game since i did not liked that braking effect. Is there way to get around it or it is something I have to live it? Thanks

So, I also use the emc software along with stm32 f4ve board. And i'm having problems with the wheel keeping his center. Everytime I unplug the board from the pc, i have to redo the wheel center and sometimes in game the center is sliding sometimes with 4 degrees, sometimes more.

I use the OMRON E6B2-CWZ6C 1000P/R encoder. This is the wiring i did, the resistors are 4.5kohm

4.5k can be too much in a 5v line. Use 2.2k. But not too much less also. Will sag the voltage of a controller then.

I will try that tomorrow and let you know if that worked. Thanks

I have 1k pull-ups and no issues so far. I usually use 1k pull-ups and pull-downs in my circuits and never had problems.
For why it is not remembering center, I would suspect software not saving it?

Now I think that it's not remembering the center because I disconnect the power. But the drifting still occurs. Do you use the same encoder?

Yes. Ordered from Alliexpress, not sure if real omron or not, looks legit. Does the drift occurs randomly or it happens when turning a wheel? I had similar problem when real position drift away from sensed position in one direction after turning wheel. I was able to track it down to lose connection of A wire (on stm32) from encoder resulting in missed pulses

Thing is, untill measure the voltage. It can work fine, but has a voltage sag anyway. And it's better not to have it)

Centre loose occured with 2channel encoders. Doesn't get saved. It's not a big deal. Also, don't unplug the encoder. If so, u've to replug the controller usb too, with plugged in encoder beforehand. Better use soldering connections if smth too.

Drifting occurs only when turning from left to right. Sometimes it works as intended, not drifting. I tried with an arduino leonardo board, plugged the encoder directly, without resistors and works without problems.

Yeah, i don't mind that if I unplug the stm32 board from the pc i have to calibrate the center again, what really bothers me is that after calibrating in software, and saying that z index found and all that and i get in acc, driving a little bit and the center drifts to the right. If i keep the wheel straight, it's not drifting, but if i move right, left and right again, it drifts a bit.


LE: I put the 2.2k resistors and for now seems to be fine. Thanks a lot for the help

Ok, same problem again. Another thing i saw was that if i move the wheel slow, from left to right there is no drifting. But if i move it fast, the led D2 from the smt board blinks, and then the drifting occurs. I can't understand what is wrong.

Replace the wires for encoder. You have bad contact. Replug stm everytime you disconnect the encoder too.