got my esp32 devkitc from china
it seems i am very unlucky this one does not work too
no modules found no testcode work
have tryed new firmware(25) and from other computer
i made a putty screenshot on testcode
That output looks like it is reporting an invalid application image. Perhaps try and erase the flash and try again?
disconnected again from pcb and flashed test code
same putty output - invalid header
i dont know what else to do
this is crazy
have ordered 2 new esp from other seller, this is insane.
Just to be safe, try flashing one of the older releases, just in case a problem has crept into the new build process on GitHub.
where can i get the oldest controller test file for flashing with node mcu flasher?
They are all on GitHub, in the release section
the controller test file is only available since 3-17 release
Hey Stuart, there are lcd touch panel displays available with an sd card slot on them, will that work if I just remove the card slot on the board?
No need to remove the card slot on the board, just don’t use both at the same time
Sorry didn’t realize you were using the test file.
That file cannot be programmed using nodemcu flash tool, the file is not the correct format.
Can you use the real controller code without problem?
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Stuart
2 of my 4 test v4.21 modules are not working,
i tried this with the new arived v4.4 modules and they worked on first try with old and new firmwares
have soldered the attinys exactly the same on 4.4 and 4.21 modules
maybe some bad solder on attiny il check this
How did you program them? Suspect it’s the fuse settings.
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programed them over the internal AVR programmer
mangaed them all to work i soldered the attinys with solderpaste but a tiny amount has not melted
was hard to see behind the legs so i thik it caused some sort of short between some legs.
so thank you for your help.
additional question is ist possible to adjust the load resistance in module settings?
i had to change the original resistors to 5R90 because the other were not in stock
so i need to adjust to 4.72ohms if its necessary?
thanks
You can only do this by recompiling the firmware, and programming manually.
Let me know if you want to go down this route.
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oh no thats to complicated for me
i leave it as a indicator if some cell is bad i wil see that one is balancing more than the other
Hello,
I have search in github a readme file providing the meanings and troubleshooting of OOS errors, CRC errors and all the info in the homepage that gives information of voltage, send packets etc. I found in this thread that CRC errors was related to the power source giving to the controller of at least 2amps. The rest of the error code can’t find info.
Thanks in advance for any help.
There are only 2 types of communication errors.
CRC errors relate to corrupted data caused by interference.
out of sequence OOS errors mean a packet of data was lost/never received by the controller.
Either way, they are both normally caused by not using twisted cables or having the cables too long and near the AC inverter etc.
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Excellent! Thanks for your help and keep up with this incredible project Stuart.
@Malloween
I’m not exactly sure what you are asking.
The dump load of the module 4.21 is 0.8A, and the 4.40 about 1.2A without heatsink.
The dump is limited via temperature sensor.
With efficient cooling, it will be roughly 50% more.
That is per module, connected to one or more (parallel) cells.
This should be enough when you top balance the battery pack, unless the cells are badly unbalanced.
If you charge with 10A, and one cell is 99% charged where the rest is 85-90%, then the charging continues at 10A.
Result… you need to discharge that one cell with 10A to have the other cells catch up.
With large imbalance, I suggest to use 50watt resistor and place that on the too high charged cell during this phase.
Once all cells are around the same level, 96-99%, the 0.8A is more then enough to balance, as the charge will change from Constant Current to Constant Voltage, so your charging amperage will drop to almost nothing, topping the last few %
Daly BMS uses just 80mA (0.08A), what is sufficient if you top balance most charge cycles.
Examples on how to calculate?
Google ohms law.
The part list can be found at GitHub.
Probably not the direct answer you hoped for, but the best, as you get to educate yourself on how to make these calculations.
Important to be able to understand what the numbers mean, and how it will reflect you your own installation!
I do hope this helps you enough to get the correct direction to find the answers you seek.
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