stuartpittaway
commented
6 months ago Hello @brii999, thanks for trying out DIYBMS.
The CAN controller chip I use on the controller is SN65HVD1050D https://www.ti.com/lit/ds/symlink/sn65hvd1050.pdf
This chip operates at 5 volt and doesn't use pin 5 - its not connected on the PCB.
If you are using the TJA1057GT/3 then pin 5 is expected to be "VIO" - you might be able to make your chip work by connecting pin 5 to +5V (a wire soldered between pin 3 and pin 5 should do it).
Alternatively, swap out that CAN chip for the recommended SN65HVD1050D
brii999
atanisoft
Hi.
First of all, thanks a lot for creating such a great project like diyBMS.
I am assembling my own energy storage and I have reached the stage where I want to connect diyBMS with Cerbo GX from Victron.
I created the appropriate cable, checked whether it had continuity and connected it to Cerbo and BMS. Unfortunately, the data from the BMS did not appear in Cerbo and the BMS itself started to restart. I connected via the serial port and watched the logs:
I changed the firmware to an older one, suspecting that there might be some regression in the latest one. I loaded the version from 2023-03-29, after turning on CAN communication, the "CAN send error" counter started to increase, but the BMS did not restart, logs from the serial port below:
I tried using the second and third controller boards and different ESP32 - it didn't change anything, still the same messages. I tried to look for some trace on the network, but I only found one to check the voltage level on PIN 8 of TJA1057GT/3J - in my case it was 0V regardless of whether CAN was turned on or off. I also decided to check the supply voltage for this system and it was 5.1V and for Vio 3.2V.
The 120 Ohm resistor is active (JP1 bridge soldered), the resistance between the terminal ends has been checked. Cerbo has a 120Ohm terminator. To make sure that the problem was not Cerbo, I checked using Sparkfun CANBUS Shield whether any packets were passing through. After connecting to Cerbo, you can see that Cerbo is sending packets and I am receiving them without any problems. I later connected to DIYBMS to the CAN terminals, but unfortunately there were no packets visible here and the CAN send error counter kept growing. I replaced the pins just in case, but it didn't change anything.
The CAN chip I have soldered (the entire assembly was done by JLCPCB) is NXP A1057G3 (CQSL4 Zn206).
I have no idea what could be wrong - I would be grateful for any tips on how to pursue the issue further.