Update:
The AC Present signal toggles like I want, but only if the enable signal is active. I was hoping that I could enable the charger when AC is present so I'll have to rethink that approach. What's the difference between Out2 AC Present and Out1 HV enable?

Hey all,
I'm using the Tesla Gen 2 Charger with Damian's board and things seem to be working for the most part, but I can't get the AC Present (Pin A1) to do anything. I'm using it to control the negative coil side of a standard 12V automotive relay. Here's an example of how I'm controlling the ...

Please do not post about this in this thread but create a spin off. This is not original SimpBMS firmware released by myself.

Great to see other contribute with support for Chevy Volt Gen 2 packs, but this is a completely different approach then used on all other applications of the "SimpBMS ...

Ok I got a new strange error code:

Compilation error: 'unsigned char Serial_CAN::exitSettingMode()' is private within this context

Full error result attached. (too large to put into post)


Ya, I opened an issue about that. The exitSettingMode() method in the Serial_CAN library needs to be set ...

Not sure about the freeROTS issue, but rename your config.H to config.h and it should work. I don’t think GitHub picks up the case change when you commit but Arduino does. I’ll force a fix when I’m back home at the end of the month

Has anyone used the VoltBMSV2 code yet? My Simp was constantly restarting because the watchdog wasn't updating. I got it to "work" by commenting out the cleartime block of the main loop, but I'm wondering if this version of the code is still in progress. It's possible I just don't have the settings ...

Got it. I'm hoping to do the entire battery swap this weekend, and then I can start doing some logging. That should help us figure out which (if any) include things like SOC and current.


I wasn't able to get into the current or SOC messages from the BECM, but I was able to iron out some issues ...

Sort of... the DBC file has those messages defined, but I've never seen them come through. The messages I do get are:
0x200 - "Module 1" voltages
0x202 - "Module 2" voltages
0x204 - "Module 3" voltages
0x206 - "Module 4" voltages
0x208 - ???
0x20C - ???
0x216 - ???
0x260 - ???
0x262 - ???
0x270 ...

I just dug into that a little bit and none of my changes should affect the way the SOC is calculated. You can change the SIMP configuration to use either voltage based SOC or the current sensor based SOC. Assuming it worked before, it will probably still work.
That being said... I did notice that ...

That's super interesting. I had seen that list of PIDs before, but I'm not sure it will do me much good. I'm not any kind of expert on the OBDII protocol, but from what I understand it's more of a query/response setup. You'd need to figure the right format to send the query and then monitor for the ...

Ya, the VoltBMSV2.ino is what you want to build. Make sure you're on the Gen2Voltage branch of the repo. I'll cleanup the documentation and do a writeup once I get it to the point where it's "working." I honestly didn't think anyone else would ever see this!
Let me know once you find the details ...

Interesting news on the Spark pack. I based my work for the voltage and temp data on the OpenDBC files: https://github.com/commaai/opendbc
What error messages are you expecting to get directly from the onboard BMS?
I have my code up here: https://github.com/amsmntparks/AmperaBattery
A couple of ...

Thanks for starting up that old thread P.S.Magelsdorf!
I did get another BECM and can read cell voltages and temps now. The real problem was that I didn't have my pack fully connected together. The new BECM was still showing modules with 0 volts until I reconnected all the modules back together. My ...

I've reworked the SimpBMS code to work with a Gen 2 Volt pack. I haven't tried it in while actually charging yet, but that's coming soon. Glad there's some renewed interest in getting these to work!

The outstanding questions to me would be:
- Do we know enough to get SOC, temperature, and error ...

I've got a battery from a 2019 Volt and all the cells are good, but I think the BECM is reporting that the front module has not voltage. The ultimate goal is to be able to plug into the stock BECM and use something like the Simp BMS to control the pack.
I'm using the dbc file from the opendbc github ...

I spent all weekend trying to get the BMS to work with the Gen 2 pack, and I learned a lot. The biggest takeaways are that the Gen 2 pack uses different CAN addresses and formats than the Gen 1. I'm pretty sure I can get the Simp BMS to work with the new messages based on the DBC info I found on the ...

I saw a V2 version of the Volt BMS and mistakenly thought it was for the Gen2 Volt batteries. Is there any chance someone is working on that?
Regardless, when I loaded that hex on a 2.3 board it gets stuck in a reboot loop. Is that normal if it's not connected to a gen1 CAN?