DIYBMS v4 thoughts

[sunseeker]

Apart from the Question on how to order the preassembed modules on JLCPCB, which is now clear to me (thanks to @IronSky), I had the problem that the BOM and CPL files are not part of the git repository on GitHub. They seem to only be included in the zip file.
So since I went the developers way of cloning a repository using the git clone command, I just couldn't find them in my local folder.
Now it's all good and the modules are ordered, apart from the ATTINY841-SSU ICs, that weren't available. I ordered them seperately and will have to solder them on myself.

If someone is looking for the hint that helped me, there is a switch below the form where one has to upload the gerber files zip, it says "Free SMT Assembly for your PCB order". If you activate this, the order wizard will ask for the BOM and CPL file from the zip. Just choose the appropriate quantities for controller and the modules, the rest can stay on default values. On the final page it will tell you if all parts are available. As mentioned above, the ATTINY were missing for me.

 

[gigaz]

Sorry for the noob question, but how can I order these boards preassembled from JLCPCB? I know I can upload the gerber files for the boards, but how to go from there?
Thanks!

Stuart has a new video on ordering PCBs.

Followed the video, ordered with prepaid duties (nice to avoid the portuguese customs while still paying legal fees)on the 4th of July. Was produced and assembled, left china on the 9th, shipped via Germany where it arrived on the 10th, went on a sightseeing tour and was delivered in the european distribution center on the 17th... where it still sits, must be waiting for other orders till the stage coach that comes westbound monthly gets full.
[img=200x100]https://thumbs.dreamstime.com/b/doi...-os-isolados-fundo-branco-148568514.jpg[/img]

Now, when you guys don't undestand when I asked about an european group buy, please remember that this happens a lot for some periferal countries within the EU.

 

[gigaz]

and it's here!
Already halfway populating the remaining components, some are due to arrive today as well

I'll have 3 extra controller pcbs that I don't need, if somebody wants them let me know.

 

[Patalhetas]

and it's here!
Already halfway populating the remaining components, some are due to arrive today as well

I'll have 3 extra controller pcbs that I don't need, if somebody wants them let me know.

Hi gigaz,
this extra controller pcbs are components assembled ?

 

[fpv1812]

I have been trying to build this BMS since version 3.i have not got one to work yet. So I ordered the built units from jlc. I have put the chip on does not work. I get the BMS screen up and it shows packets sent. I attach cell module TX to Rx and a cell to power pins. The unit flashes blue led but that's it sometimes the red led flashes nothing on computer screen. I am not a beginner in hobby but this has really stumped me. So I thought does it work with only one module I want to get one working before I build any more. Any thoughts please. I program with usbasp so should be ok on that???.

 

[not2bme]

I have been trying to build this BMS since version 3.i have not got one to work yet. So I ordered the built units from jlc. I have put the chip on does not work. I get the BMS screen up and it shows packets sent. I attach cell module TX to Rx and a cell to power pins. The unit flashes blue led but that's it sometimes the red led flashes nothing on computer screen. I am not a beginner in hobby but this has really stumped me. So I thought does it work with only one module I want to get one working before I build any more. Any thoughts please. I program with usbasp so should be ok on that???.

Stuart is active on the openenegrymonitor group. I'd say ask your questions there first.

https://community.openenergymonitor.org/t/diybms-v4/11292/2242

 

[gigaz]

and it's here!
Already halfway populating the remaining components, some are due to arrive today as well

I'll have 3 extra controller pcbs that I don't need, if somebody wants them let me know.

Hi gigaz,
this extra controller pcbs are components assembled ?

I ordered blank controller pcbs, not worth the difference for 4 resistors and a led.
If you want to use the outputs then you solder in the expander chip later.
I can solder the resistors and optocouplers and send them to you if you don't mind waiting. PM with address

---

I have been trying to build this BMS since version 3.i have not got one to work yet. So I ordered the built units from jlc. I have put the chip on does not work. I get the BMS screen up and it shows packets sent. I attach cell module TX to Rx and a cell to power pins. The unit flashes blue led but that's it sometimes the red led flashes nothing on computer screen. I am not a beginner in hobby but this has really stumped me. So I thought does it work with only one module I want to get one working before I build any more. Any thoughts please. I program with usbasp so should be ok on that???.

Version 3 used a different scheme for communicating, the expensive SPI isolators, you had to provision them in the software first.
Should work with just one, but I haven't tried V3

 

[Patalhetas]

and it's here!
Already halfway populating the remaining components, some are due to arrive today as well

I'll have 3 extra controller pcbs that I don't need, if somebody wants them let me know.

Hi gigaz,
this extra controller pcbs are components assembled ?

I ordered blank controller pcbs, not worth the difference for 4 resistors and a led.
If you want to use the outputs then you solder in the expander chip later.
I can solder the resistors and optocouplers and send them to you if you don't mind waiting. PM with address

---

PM send

---

 

[MasterCATZ]

If anyone in Australia would like some let me know as I ordered extra
going to give up waiting for a ATtiny841 to ever be in stock ... and getting from digikey (cheaper as well )

currently have 5 controllers / 90 Circuits ordered

and will get the new controllers / shunt system when they are released

 

[chmistry]

.... and I bought the voltage reference from AliExpress. I am still waiting on the voltage reference diode as I ordered it late and the current situation in China is causing a lot of delays.

There is also an updated BOM available also to have the boards mostly assembled by JLCPCB for version 4.2 of the board.

Sorry for quoting you after such a long time... I ordered my boards in March and had to swap R18 and R19. I also ordered the voltage references from Ali using your link, however they seem to be the wrong type.

Since my progress has been slow, I just finished the boards and my battery pack, they highest voltage I can read is 3.032V. Did you have the same issue? Could you fix it?

 

[nz_lifer]

If anyone in Australia would like some let me know as I ordered extra
going to give up waiting for a ATtiny841 to ever be in stock ... and getting from digikey (cheaper as well )

currently have 5 controllers / 90 Circuits ordered

and will get the new controllers / shunt system when they are released

Is NZ close enough? Would be keen to take up your offer

 

[fpv1812]

Definitely go the pre-assembled route with DIYBMS. It will be cheaper then buying the components, boards, solder paste, etc separately and the only part you need to solder is the ATtiny.


View attachment 21014


(April 1)These attachments should not be used as there is an issue with R19 & R20 being switched in the BOM. You should use V4.21 if you are having JLCPCB assembly service.

i have the pressembled ones and home built ones.Home built ones are more robust on the assembled ones i have a problem with the voltage ref burning out after about a month.The ref is different than the home build board.i just replace the ref after fault develops but board goes U.S after 6 months???

 

[Bubba]

deleted

 

[daromer]

Its time for me to start doing some reporting as well and instead of starting a new thread i will add my current information into here for now. I will and I actually already have some data about in my Raspberry Thread regarding grafana and all those things and i will fill that out too but for now here is 2 of my videos made and i have more on its way. I have it running already on a 20+kwh powerwall and im fiddling alot with accessorires like shunt trip breakers and others

And if you havent already: Please subscribe

And for the new master unit i finally after weeks got a first specimin. Though my JLCPCB order is way off delayed due to missing parts and yes i know i can order them from somewhere else but i like the idea of getting them as much preassembled as possible.

 

[jdeadman]

Well I finally took the Dive. I ordered enough for 14 cells and a controller Cannot wait to start

 

[daromer]

Good call. Im waiting for the shunt to arrive. But the bloody shipping now is killing it and i most likely wont get it before Stuart open it up to everyone

 

[jdeadman]

Is there a specific shunt that works best with this sysytem? I have a cheap 100A 75Ohm one

 

[daromer]

He have built a generic shunt board that will have open source protocol. On that shunt you can bolt on a shunt of specific type.
For DIY BMS you need to run this board but i guess you can pick different shunts as such afterwards.

You can see an image of the board with a shunt on top: https://community.openenergymonitor.org/t/diybms-v4-shunt-design-and-discussion/14750/325

 

[jdeadman]

AHH Ic I've only started to scratch the surface with my knowledge of this system so I will be doing lots of reading

 

[daromer]

No worries. I know some (Since i do code towards it) So i will gladly help here to