JK BMS CAN bus comms now possible for inverters that support Goodwe and Pylontech batteries

chaosnature said:

I am about the only person not managing to get this to work and i have so many of the Atom Lite chips lying around -this is now a little frustrating

anyone can find out what i might be doing wrong

i perform first use 1st to have the DHCP release ip which i have used as the static config on the wifi section

Code attached .....

Click to expand...

chaosnature said:

O.k - i figured it out -solved my own problem

means I was one of the first if not the first to really know how to flash an S3 on this project as i was one of the first to purchase it for this process and i did exactly what i did now except i didn't follow it all the way through to the final step which is to do an update over the wireless.

Click to expand...

chaosnature said:

I have documented the process in the below link:

How to Flash Atom S3 with EspHome - HA

How to Flash Atom S3 with EspHome - HA I struggled with flashing Esp32 S3 Atom lite with the (Sleeper85) project I was actively involved for the Rs485/CAN battery Comm conversion - unlike flashing the Esp32 dev kit chip, it's not as straightforward. but I finally found a way around it...

diysolarforum.com

Hope it helps other HA EspHome users.

Click to expand...

knd said:

hello again why in the config with ATOM esp32 lite need to use:

Code:

# +--------------------------------------+
# | ESP32 CAN/serial port pins           |
# +--------------------------------------+
# GPIO pins your CAN bus transceiver ATOMIC CANBus Base (CA-IS3050G)
  can_tx_pin: GPIO5
  can_rx_pin: GPIO6

but connection is like on pic below GPIO 1 and 2 or i dont know smth

View attachment 212773

Click to expand...

can_tx_pin: GPIO2
can_rx_pin: GPIO1

arzaman said:

Be careful of GPIO asignement

the GPIO 5 and 6 are used if you use the ATOMIC CAN Base where you "plug" the ATOM S3
View attachment 215366

If you use the EXTERNAL adapter connected to Atom Groove port you need to assign the proper GPIO as reported in the sticker

Code:

can_tx_pin: GPIO2
can_rx_pin: GPIO1

Davide

Click to expand...

CANBus module CA-IS3050G - Unit expansion module for M5Stack development modules

CANBus module CA-IS3050G - Unit expansion module for M5Stack development modules from Unit extension modules category available to buy in a robotic shop Botland. Very fast shipping!

botland.store

AtomS3 Lite Dev Kit - ESP32S3 - M5Stack C124

AtomS3 Lite Dev Kit - ESP32S3 - M5Stack C124 from Atom series category available to buy in a robotic shop Botland. Very fast shipping!

botland.store

knd said:

as You can see my ATOM S3 lite is connected different with this CANBUS and i'm using 1 and 2 GPIO it is direct connected to these GPIO-s but with CAN described on github it seems to use 5 and 6 so as You said - look at hardware and pineout my setup is working

im using these

CANBus module CA-IS3050G - Unit expansion module for M5Stack development modules

CANBus module CA-IS3050G - Unit expansion module for M5Stack development modules from Unit extension modules category available to buy in a robotic shop Botland. Very fast shipping!

botland.store

with

AtomS3 Lite Dev Kit - ESP32S3 - M5Stack C124

AtomS3 Lite Dev Kit - ESP32S3 - M5Stack C124 from Atom series category available to buy in a robotic shop Botland. Very fast shipping!

botland.store

Click to expand...

1. The solution is less pretty than using Atomic CAN base
2. GPIOs 1 and 2 can no longer be used to connect a BMS via UART

Sleeper85 said:

Yes it works but:

1. The solution is less pretty than using Atomic CAN base
2. GPIOs 1 and 2 can no longer be used to connect a BMS via UART

So why not buy Atomic CAN base?

Click to expand...

knd said:

it was not avaiable on my country and when i look with esp code (CA-IS3050G)
i just found this, i dont use UART (GPS) so with BT works OK. Maybe later i'll find Atomic CAN base to use with parralell JK-BMS

and i bought JK-BMS HEAT/CAN version and they dont give me cable to UART port )) so BT was easier to me for now

Click to expand...

# Float Voltage : corresponds to the voltage at which the battery would be maintained at the end of the absorption phase. (53.6V = 3.35V/Cell for 16S battery)
float_v: "53.6"
# Bulk / Absorption Voltage : corresponds to the Bulk voltage that will be used to charge the battery. (55.2V = 3.45V/Cell for 16S battery)
bulk_v: "55.2"
# Rebulk voltage, voltage less than FLOAT at which BMS requests rebulk. (52.8V = 3.3V/Cell for 16S battery)
rebulk_v: "52.8"

Click to expand...