Hi, I’ve prepared a 14S100P battery controlled with your cells manager and a M5stack a controller filling an influx database.
Thanks for all the work done and for sharing it.
I’ve started some tests and actually have two questions :
how should I calibrate each modules to have consistant and accurate measurements ?
is the bank voltage measured and shared performed with bypass active when it is activated ? I clearly see tensions drops when in bypass mode, what’s making the overall tensions evaluation not consistent. bypass impact snapshot
Thanks for your tips
Measure the cell the module is monitoring (directly at the cell terminals) using a quality multimeter. Enter that voltage reading into the “Modules” page on the controller web interface and click “calculate” to automatically set the calibration value. Then click Save.
You should find the default configuration value is fairly close.
The bank voltage simply adds up the voltage each module measures and shows it on screen. It will be bouncing around during balancing.
An external current shunt and voltage measurement board/device is currently being worked on which would sit outside of the modules and measure the whole pack.
It might be that this already has been answered and in that case as do apologise in advance.
Compiling cell module worked fine but not the controller. Have tried both on windows and on mac but getting a number of errors. I compared my version with posting from a couple of days ago and I’m running exactly the same version. Probably I’m missing something simple but can’t find what.
This is the error:
In file included from src/PacketRequestGenerator.cpp:1:0:
include/PacketRequestGenerator.h:26:34: error: expected ')' before '*' token
PacketRequestGenerator(Queue* requestQ) {_requestq=requestQ;}
^
In file included from src/PacketRequestGenerator.cpp:1:0:
include/PacketRequestGenerator.h:44:5: error: 'Queue' does not name a type
Queue* _requestq;
^
src/PacketRequestGenerator.cpp: In member function 'void PacketRequestGenerator::pushPacketToQueue()':
src/PacketRequestGenerator.cpp:168:3: error: '_requestq' was not declared in this scope
_requestq->push(&_packetbuffer);
^
src/PacketRequestGenerator.cpp: In member function 'uint16_t PacketRequestGenerator::QueueLength()':
src/PacketRequestGenerator.cpp:173:10: error: '_requestq' was not declared in this scope
return _requestq->getRemainingCount();
^
src/PacketRequestGenerator.cpp:174:1: warning: control reaches end of non-void function [-Wreturn-type]
}
^
*** [.pio/build/esp8266_d1minipro/src/PacketRequestGenerator.cpp.o] Error 1
src/SoftAP.cpp: In static member function 'static void DIYBMSSoftAP::SetupAccessPoint(AsyncWebServer*)':
src/SoftAP.cpp:91:41: warning: 'SPIFFS' is deprecated (declared at /Users/matced/.platformio/packages/framework-arduinoespressif8266/cores/esp8266/FS.h:269): SPIFFS has been deprecated. Please consider moving to LittleFS or other filesystems. [-Wdeprecated-declarations]
_myserver->serveStatic("/softap.htm", SPIFFS, "/softap/softap.htm").setTemplateProcessor(DIYBMSSoftAP::TemplateProcessor);
^
In file included from include/DIYBMSServer.h:21:0,
from src/DIYBMSServer.cpp:26:
include/PacketRequestGenerator.h:26:34: error: expected ')' before '*' token
PacketRequestGenerator(Queue* requestQ) {_requestq=requestQ;}
^
In file included from include/DIYBMSServer.h:21:0,
from src/DIYBMSServer.cpp:26:
include/PacketRequestGenerator.h:44:5: error: 'Queue' does not name a type
Queue* _requestq;
^
src/DIYBMSServer.cpp: In static member function 'static void DIYBMSServer::StartServer(AsyncWebServer*)':
src/DIYBMSServer.cpp:863:42: warning: 'SPIFFS' is deprecated (declared at /Users/matced/.platformio/packages/framework-arduinoespressif8266/cores/esp8266/FS.h:269): SPIFFS has been deprecated. Please consider moving to LittleFS or other filesystems. [-Wdeprecated-declarations]
_myserver->serveStatic("/default.htm", SPIFFS, "/default.htm").setTemplateProcessor(DIYBMSServer::TemplateProcessor);
^
src/DIYBMSServer.cpp:864:37: warning: 'SPIFFS' is deprecated (declared at /Users/matced/.platformio/packages/framework-arduinoespressif8266/cores/esp8266/FS.h:269): SPIFFS has been deprecated. Please consider moving to LittleFS or other filesystems. [-Wdeprecated-declarations]
_myserver->serveStatic("/files/", SPIFFS, "/files/").setCacheControl("max-age=600");
^
In file included from include/DIYBMSServer.h:21:0,
from src/main.cpp:106:
include/PacketRequestGenerator.h:26:34: error: expected ')' before '*' token
PacketRequestGenerator(Queue* requestQ) {_requestq=requestQ;}
^
In file included from include/DIYBMSServer.h:21:0,
from src/main.cpp:106:
include/PacketRequestGenerator.h:44:5: error: 'Queue' does not name a type
Queue* _requestq;
^
src/main.cpp:111:1: error: 'Queue' does not name a type
Queue requestQueue(sizeof(packet), 16, FIFO);
^
src/main.cpp:113:54: error: 'requestQueue' was not declared in this scope
PacketRequestGenerator prg = PacketRequestGenerator(&requestQueue);
^
src/main.cpp: In function 'void timerTransmitCallback()':
src/main.cpp:250:8: error: 'requestQueue' was not declared in this scope
if (!requestQueue.isEmpty())
^
src/main.cpp: In function 'void setup()':
src/main.cpp:1162:8: warning: 'SPIFFS' is deprecated (declared at /Users/matced/.platformio/packages/framework-arduinoespressif8266/cores/esp8266/FS.h:269): SPIFFS has been deprecated. Please consider moving to LittleFS or other filesystems. [-Wdeprecated-declarations]
if (!SPIFFS.begin())
^
*** [.pio/build/esp8266_d1minipro/src/DIYBMSServer.cpp.o] Error 1
*** [.pio/build/esp8266_d1minipro/src/main.cpp.o] Error 1
You need to apply the patch using git commands, I’ll guess that Stuart will fix it rather soon.
If you feeling adventurous you can always replace the references to “Queue” with “cppQueue” manually, only three places or so to update.
I’m not 100% sure that everything is working in my setup yet, have controller installed but not able to see any of my cell modules, that is my next “battle” to take on.
I’m soon of to bed (late here) so might be a while before any more reply.
Cool. I’m not adventurous enough for that. I’ll wait I guess. You wouldn’t think it eh, but 30 years in IT for international companies. But I have some mental block when it comes to programming and anything more then the basics of Platform.io.
While it may only be 3 places I don’t know what files they are in. So I’ll put it on hold. I’m running an older version of the code, and it’s doing the job at the moment so no rush. It’s been working for a good year at this rate
The issue with the master branch not compiling due to the external Queue library being renamed has been fixed. The code is in the master branch on GitHub.
Hi again,
Another question, if I remove the resistors for an external load the power dissipation limit is fixed by Q1 spec ? I think about grouping 10W loads in a dedicated box to reuse the heat.
Regards,
The problem with this is that it takes several seconds for the voltage to “bounce back” when the load is removed from the cell. This makes it almost impossible to balance and take “unloaded” measurements at the same time.
It may be possible to calculate this if the internal resistance of the cell is known, as this is what causes the voltage drop in the first place.
