@Ross did you just lower the resistor values or did you change anything else?
What balance current are you now running with?
Where is a list of components that still need to purchased and installed after jlcpcb smt service?
Hi, I donāt think a list exists.
You will need cables and JST sockets/plugs and the ATTINY841 chips.
Stuart Iām looking to order from jlcpcb but they still have Q1 missing, but two other makes that you can choose
when comparing the data sheets they are slightly different
Do you know if I can choose one of the other makes
Hello all,
Iām currently building multiple 4S10P lithium batteryās with cells i recycle from my work. (Third almost done)
Is it possible someone could make a small diybms board compatible with 4 cells instead off 1?
Greetings,
Lex
Hi Brian, Iāve not used the other devices so I canāt recommend either one Iām afraid. The OEM shop has stock of the boards available if you want a complete kit of parts.
@stuart I can donate a few esp32 devkitās, for testing the esp32 controller code
This should already be possible, what size/type of battery are you trying to build?
Hi,
Iām having trouble programming the modules, I bought SMT assembled v4.21 modules from JLC PCB I just soldered the attiny841 to 10 modules and only 2 of the 10 boards did upload successfully. (I followed Start steps from YouTube)
avrdude: 7816 bytes of flash written
avrdude: verifying flash memory against .pio/build/attiny841_V421/firmware.hex:
avrdude: load data flash data from input file .pio/build/attiny841_V421/firmware.hex:
avrdude: input file .pio/build/attiny841_V421/firmware.hex contains 7816 bytes
avrdude: reading on-chip flash data:Reading | ################################################## | 100% 4.49s
avrdude: verifying ā¦
avrdude: verification error, first mismatch at byte 0x0010
0xff != 0x70
avrdude: verification error; content mismatchavrdude: safemode: lfuse reads as E2
avrdude: safemode: hfuse reads as D6
avrdude: safemode: efuse reads as F4
avrdude: safemode: Fuses OK (E:F4, H:D6, L:E2)avrdude done. Thank you.
*** [upload] Error 1
============================================== [FAILED] Took 11.23 seconds
On my MacBook the first mismatch is always at byte 0x0010 but I also tried programming the module from a windows computer and there the first mismatch is changing eg. 0x0200 or 0x0520ā¦
I tried to reupload one of the modules that was programmed successfully and the same error occurred. Iām using a usbasp programer
Has anyone any suggestions what should I do to make it work?
Is it possible to run diyBMS without Wi-Fi?
Iād like to add a small LCD for a mobile battery.
Are there any examples of anyone adding an LCD, code wise? If not, whereabouts in the code would it make sense to output important status values to the LCD? I have some limited experience with adding LCDs to arduino projects.
I created an issue just for this purpose [Controller to stay in access point mode for offline applications Ā· Issue #6 Ā· stuartpittaway/diyBMSv4Code Ā· GitHub]
although at the moment, Iāve not worked on it. Iām also planning to add a small display (optional) for the next version of the controller.
Hello @kemot96, assuming that you didnāt change any of the parts when you ordered from JLCPCB, this will be a soldering issue, particularly as 2 of the boards work.
From the pictures, the soldering looks very neat, however, take a closer lookā¦
Iām seeing small blobs of solder - it could just be the photo, but theres probably some āsplatterā near the pins.
Thanks! So does that mean without wifi, the bms wonāt function? What if the local router dies?
If the router/internet goes down the BMS continues to function, but you canāt get to the web interface. It should be easy enough to leave the ESP8266 access point enabled rather than switching to the router wifi.
The two time based rules (for driving relays) wonāt work without an internet NTP server to calibrate the current time.
That makes sense. So once connected via soft access point, the web ui can be accessed? Is there a specific ip address/address to access the ui when connected like this?
9 posts were split to a new topic: I want to create a modular battery system
Its the default ESP one 192.168.4.1
8 posts were split to a new topic: DIYBMS publishing MQTT to EMONCMS
Thank you @stuart, I ended up reflowing it with a heat gun and it work like a charm.
And thank you for the excellent work you did designing this BMS!
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3 posts were merged into an existing topic: Platform IO V5 āUpload file system imageā option moved