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Do not know exactly what I have done, but now it works.

Hello all together... I build the project and i have all the problems I can run into. But at the end i finished the project. But now I have the problem that the m5stack turn red when readding the bms and beeps and "BMS Read Error" "CMD: 148" . Between the flashing and the beep I can read that...

Thank you for your support. I will try it today and give feedback if it works or not. My thoughts are also that the level of the signals from the bms are already 3,3V and with the voltage drop of the diodes it is to low. I think I will also try it without the limiter.

Wow, thank you so much for your fast replay. I use the code DiySolarU posted in his comment. M5Stack_DALY_SOLIS_Converter_24 I use the code in the main.cpp.

I comment it out as you show. Now it puts out the same error message, but with the code CMD:147 and it is just the cmd error, but it beeps every second with the same message and with no cables from the bms, it is also red display and the error message but with BMS Read Error CMD: 0 I use the...

Between the short flashes I can read read some of the values. and they seam to be right. It loos like the thubnail of DiySolarU. I tried to swapp tx / rx but than it does put out the CMD:0 like without cables at all

Thank you very much for your help and your time. I will try it out but I think I have to begin with more basic stuff to learn. This is already to high end for me :) Which delay's I have to increase?

Still the same Error.