For those of you looking to monitor your ANT-BMS with Pi3 via Bluetooth.

[Alpha60]

Notez également que mon code ajoute 0,7V à la tension du pack. Mon BMS lit bas, c'est donc un bon moyen de corriger.

#BMS V
data = (Antw33.encode ('hex') [8:12])
data = struct.unpack ('> H', unhexlify (données)) [0] * 0.1
données = données + 0,7
Le n ° 0,7

Also, take note that my code is adding 0.7V to the pack voltage. My BMS reads low so this is a good way to correct.

#BMS V
data = (Antw33.encode('hex') [8:12])
data = struct.unpack('>H',unhexlify(data))[0]*0.1
data = data+0.7
#0.7 was added as BMS low.
print (data)

OK I had seen but I use another code which transmits the data by Simple-api, I checked the voltage of the bms with my multimeter and it indicates the same thing on the other hand I did not check the amps nor the watts

 

[Lucasss]

BTW, I can control the BMS now. The checksum is just the sum of the 3 bytes (address + data + data).

So.... sending it:

'A5A5FA0000FA' # Turn Off Charge MOSFET
'A5A5FA0001FB' # Turn On Charge MOSFET
'A5A5FE0000FE' # Reboot BMS
'A5A5F90000F9' # Turn Off DisCharge MOSFET
'A5A5F90001FA' # Turn On DisCharge MOSFET
'A5A5FC0000FC' # Toggles balancing

Adding this in case the future me forgets and has to google it.

I edit the file of @JaseZA and now i can see the mosfet status with mqtt,but i wish i could change the status from mqtt ... Is it possible?

 

[Lucasss]

I edit the file of @JaseZA and now i can see the mosfet status with mqtt,but i wish i could change the status from mqtt ... Is it possible?

@pjones I saw that you tried to change these settings, were you able to get results?

 

[djcalinro]

did you manage to modify it to post in emoncms?

 

[sibianul]

Thank you guys for the python code posted in this thread, I also want to port it to arduino but currently I had some issues with my HC-05 module and I gave up trying with arduino, so I grab a spare Raspberry Pi Zero w and happily after a few hours I was able to talk to Ant BMS module.

I modified the code as I needed to have the information's sent to my local server trough http (I never had enough free time to learn, install and work with MQTT) and I also didn't like the approach of sending each value with a different request, so I modified the code, created a different variable for each value, and at the end of the code I used only one request to my local server, that includes all the values, tomorrow I will post the entire code here, after adding the temperature values too, for all 4 cell sensors + MOS temperature.

I wanted to ask you guys, regarding the power value, I sometimes seen -5 in the printed response, can someone tell me why this inversion of the number is made in this section of the code ? I understand that if data_power > 2147483648 -> invert the value of data, but why ?

try:
  if int(data_power,16)>2147483648:
    data_power=(-(2*2147483648)+int(data_power,16))
    print data_power
  else:
    data_power=int(data_power,16)
    print data_power


  data_power_url = 'BMS_power='+str(data_power)
  #  resp = req.get(url+'BMS_pow'+'?value='+str(data))
except:
   pass

Thank you

 

[sibianul]

Here is the modified code, I also confirm all 4 Cells temperature sensors work, the sensor 3 and 4 use the 100 and 102 pointer , as in the attached file.

Here is the return of my code, and the request from apache local server

pi@raspberrypizero:~ $ sudo python /home/ant-bms-bt-to-http.py
SoC=31
Remaining Ah  166.727274
BMS Power -5w
BMS current -0.1A
BMS Voltage 54.0v
Cell AVG 3.601v
Cell MIN 3.599v
Cell MAX 3.603v
Cell 01 3.603v
Cell 02 3.6v
Cell 03 3.6v
Cell 04 3.603v
Cell 05 3.599v
Cell 06 3.602v
Cell 07 3.603v
Cell 08 3.6v
Cell 09 3.6v
Cell 10 3.6v
Cell 11 3.601v
Cell 12 3.602v
Cell 13 3.602v
Cell 14 3.601v
Cell 15 3.603v
MOS Temp:  26
Balance Temp:  25
Battery Temp Sensor 1:  32
Battery Temp Sensor 2:  24
Battery Temp Sensor 3:  23
Battery Temp Sensor 4:  23

192.168.100.199 - - [10/Jun/2021:09:32:00 +0300] "GET /push.php?SoC=31%&BMS_power=-5&BMS_Current=-0.1&BMS_V=54.0&cell_avg=3.601&cell_min=3.599&cell_max=3.603&cell_1=3.603&cell_2=3.6&cell_3=3.6&cell_4=3.603&cell_5=3.599&cell_6=3.602&cell_7=3.603&cell_8=3.6&cell_9=3.6&cell_10=3.6&cell_11=3.601&cell_12=3.602&cell_13=3.602&cell_14=3.601&cell_15=3.603&mos_temperature=26&balance_temperature=25&cell_temperature_1=29&cell_temperature_2=24&cell_temperature_3=23&cell_temperature_4=23&remaining_ah=166.727274

 

[sibianul]

I wanted to ask you guys, regarding the power value, I sometimes seen -5 in the printed response, can someone tell me why this inversion of the number is made in this section of the code ? I understand that if data_power > 2147483648 -> invert the value of data, but why ?

Anyone knows the reason for this inversion made in the code ? I can modify the code, but I want to know why @chadhouser made that inversion.
I don't know yet what is the raw value of the power, but I will try to find out myself when I will also start discharging the battery. I believe @chadhouser wanted to have the power value negative when discharging battery, and positive when charging?

In my dashboard the power value is inverted, for now I set my invertor to only charge the battery, and not discharge it, it's the first time I connected the battery to my inverter, after the battery will be full I will change the inverter to SBU mode, from SUB to also discharge it.



I will increase the maximum charging current, and if I will see the temperature of the MOSfet's in the BMS will increase, I will also mount a fan or two. So far the temperature of MOSfets is very low, as you can see in the photo above.

Bellow you can see how I mounted the radiators over the ANT BMS board

 

[sixis]

That would be great getting the real soc from the battery.
But as a noob at the moment i'm getting following errors:


>>> %Run test.py
Traceback (most recent call last):
File "/home/pi/pybluez/test.py", line 7, in <module>
import bluetooth
File "/home/pi/pybluez/bluetooth/__init__.py", line 45, in <module>
from bluetooth.bluez import *
File "/home/pi/pybluez/bluetooth/bluez.py", line 10, in <module>
import bluetooth._bluetooth as _bt
ModuleNotFoundError: No module named 'bluetooth._bluetooth'
>>>

Please help me out

 

[sibianul]

do you have python-bluez installed? , if not install it using :

sudo apt-get install python-bluez

 

[JohnBerg]

I finaly managed to get the documentation online, for my ant-bms to mqtt broker project. I invite everyone to use or participate:

 

[djcalinro]

I finaly managed to get the documentation online, for my ant-bms to mqtt broker project. I invite everyone to use or participate:

View attachment 55411

can you add cells data as well? mosfet status, balance etc. thank you for this

 

[JohnBerg]

can you add cells data as well? mosfet status, balance etc. thank you for this

I am working on that

 

[Lucasss]

I edit the file of @JaseZA and now i can see the mosfet status with mqtt,but i wish i could change the status from mqtt ... Is it possible?

@JohnBerg @djcalinro i have add the mosfet status but i can t change the status with mqtt...

 

[Lucasss]

Thank you for sharing.
How do you send to Bluetooth? Via python script or via Ble out in node red?

How do you send?

 

[djcalinro]

@JohnBerg @djcalinro i have add the mosfet status but i can t change the status with mqtt...

I know you can't do that through mqtt. but I would appreciate it if you would add the function to send cell data. 16s

 

[uvfzero]

Daran arbeite ich

John nutzt du ubuntu oder debian ?

 

[Lucasss]

The python script works great but i want to use a ESP board to collect the bms stats, no one has done this?

 

[sibianul]

I also plan to use an ESP.. but didn't had time yet to try again with an different BT module. With the only BT module I had, I was stuck when I tried to detect the ANT BMS BT Address, I got ERROR (16) as I described on the arduino forum

 

[Lucasss]

i find a lot of repo on git that try to connect to the bms by the uart port https://github.com/Sgw32/BMSCtl

 

[sibianul]

I don' think we must reverse engineer anything, the communication protocol documentation is available, we need just free time, something I don't have .. and while the rPi Zero is working, I try to finish my other projects first, and only after that work on modifying already working projects.