Circuit not working with Arduino R3 and IBT-2 in SMC3 Utils

Hi all!
Please help me deal with SMC3utils IBT -2.
Compiled the diagram:
1.Arduino UNO
2. Two drivers bts7960 IBT-2
3. Two wheelchair motors 24V 250W 75RPM
4. Two power supplies 24V 15A 360W
5. Two variable resistors

I have experience building a circuit with one MonsterMoto driver, two wiper motors, and an Arduino R3 (ch340). This scheme works fine with SMC3utils in both Sim tools and a number of games (dirt rally, DSC, No limits, Assetto Corsa).


But with this rack came across a problem. Arduino flashed SMC Ver 1.00. When flashing, I indicated MODE 2. I didn’t rule anything else in the code. Attached is a screenshot of the settings. One encoder turned out to be broken and does not go into the allowable zone (because motor 2 is turned off). The second encoder is perfectly controlled. In this case, the engine does not react in any way in any modes. At the same time, there is power at the 5V driver, there is 24V at the input, Arduino flashes merrily with tx rx lights. I checked the diagram several times. Motors tested directly 24V. They work ... Tell me, please, what could be the problem?

I did everything according to the instructions. The engines did not move. Unfortunately, changing the control board did not give a positive result.

1. Could this be because I purchased multi-turn potentiometers (about 10 turns)? Or it will be critical when working with engines, and only the position of the encoder signal within acceptable limits affects the engine start.
2. It seems very strange to me the reaction of the PWM line to a change in the position of the guide (in the screenshot)

Tomorrow I will try to change the Italian arduino to the Chinese analogue CH340. Perhaps this will help.

Thank you for the answer. I will try to repeat it in English. So far I'm not connecting the encoder to the motors in any way. But I plan to use such a scheme. At the moment, this is not so significant, since if the motor is not docked with the encoder, it will simply rotate freely until the encoder axis is shifted by the fingers. In my case, the engine shows no signs of life.

I absolutely agree with you about the feedback... But I am sure the engine will move in any case, whether it receives a signal from the encoder or not. The main thing is that the encoder signal is within acceptable limits. Now I have a problem that 24V is coming to the driver and the driver does not transmit to the motor 24V ... 5V is on the driver. As for the digital signals, I can't watch them.

Please check if I'm wrong. When working correctly. By turning on SMC3utils, the motors should be centered. If the encoder is visible, its position is visible, but at the same time, when the engine moves, the encoder axis does not shift (and the axis must be shifted according to the program), then the engine will rotate freely... To infinity.

In my current solution, the encoder is attached to the motor shaft via an adapter, and it works... But if the encoder is removed and thrown on the floor (at acceptable values), the engine will not care. If he needs to shift, he will shift. In my case, the engine is completely silent with the correct settings. You say, install an encoder, in order to receive a broken connection... Will it really help?

Swapped both controllers. They behave the same way. I'm still sinning on the Italian Arduino. Quote: "The SMC3 is a "Simulator Motor Controller for 3 Motors" written for the Arduino UNO R3. At the time of writing this it has not been tested on any other Arduino model."
But R3, as far as I can tell, is a compatible board, with minimal differences. I admit that these differences may be critical to the operation of SMC3utils

So far, I have only noticed the differences that SMC does not always load settings into ita arduino. Or rather, it doesn't do it fully or correctly. So, for example, the next time I start, I may pop up deadzone to 0 on both engines or not save the last values for PWM max.

Well, in any case, so far I think it's about BTS7960 drivers. In the reviews, I came across messages when these drivers were massively defective from different parties. Now I ordered from China (they won't be superfluous) and I want to get an oscilloscope, see what's going on the digital cannel. Now I connected the R3 to a new circuit, reassembled for the third time, replaced the resistors for a shorter stroke.

Hello to everyone who wanted to help and who may face this problem in the future.

I figured it out, even though it wasn't easy for me (not an electronics technician).

Broken drivers from China. Both. I bought two pieces in Russia. Also faulty. They began to sort it out. In stock, all 30 pieces are broken). I had to poke around a little and everything worked.

Conclusion: even a few pieces may be faulty. It's not our hands that are crooked, it's your drivers that are junk!

I had to solder the 74HC244D,653 chip.

Thank you all. We are working further

https://youtube.com/shorts/e--1ZbjrBjE?feature=share

Which pins did you solder? I have some problems that the motors are only running in one direction...

My engine driver didn't work at all. In my photo, an example of poor-quality soldering of a bus converter (the second one turned out clean). The converter did not work completely, not one PIN at a time. So I think it's the settings.

Okay thanks. I'm trying to figure out my problem. Motors only turn in one direction and start stop, as shown with the green line.
Did check my wires and soldered all the wires for 1 motor, still same problem.

So unfortunately for me not the same problem as you had.

1. Before starting the motors, you need to make sure that the encoders are working. You can not supply power to the engines. Are your encoders adjusting properly?

2. kp 500 until the moment your circuit is working properly, you do not need to set it. Set to 0 and then gradually increase until the motors start to rotate. Important! If at low kp your motors turn on at full power, then the driver is not working.