I see no readings, how to eliminate hardware issues or find out what is wrong?

[Svanberg1]

Hi everyone,

Super excited about this project and my JK BMS which is working like a charm, but it would be awsome if I could control it remotely since my array is way off grid out at the family cabin and I won't be there always when its used.

After a long wait for a JST 1.25mm pitch it finally arrived today, I am struggling to get it to work. My ESP32 is up and running after some overstack issues that I could solve (removing unnecessary sensors) -- but I don't get any readings. The log just shows an endless line of:
[01:13:34][D][uart_debug:114]: >>> 4E:57:00:13:00:00:00:00:06:03:00:00:00:00:00:00:68:00:00:01:29

Does anyone have any tips for how to find out what is wrong? One alternative is of course a hardware issue. The JST is darn small and the connection from the pins of the ESP 32 to the cable could be default (although it would surprise me). Is there any way to check this? Anyone have any other ideas?

[syssi]

Which JK-BMS model and version do you own? Old BMS versions are using another protocol. Could you provide a photo of your wiring? Do you own a multimeter to measure continuity?

[vrabi-cv]

Hi there not everything is perfect:( I connected both BMS and data are comming, but I cannot read both, because after 1st BMS I got immediatelly data for 2nd and those data stays active:
[17:25:29][I][jk_bms:062]: Status frame received
[17:25:29][D][sensor:126]: 'jk-bms cell voltage 1': Sending state 3.40100 V with 3 decimals of accuracy
[17:25:29][D][sensor:126]: 'jk-bms cell voltage 2': Sending state 3.40200 V with 3 decimals of accuracy
[17:25:29][D][sensor:126]: 'jk-bms cell voltage 3': Sending state 3.40300 V with 3 decimals of accuracy
[17:25:29][D][sensor:126]: 'jk-bms cell voltage 4': Sending state 3.40500 V with 3 decimals of accuracy
[17:25:29][D][sensor:126]: 'jk-bms cell voltage 5': Sending state 3.40000 V with 3 decimals of accuracy
[17:25:29][D][sensor:126]: 'jk-bms cell voltage 6': Sending state 3.40300 V with 3 decimals of accuracy
[17:25:29][D][sensor:126]: 'jk-bms cell voltage 7': Sending state 3.40200 V with 3 decimals of accuracy
[17:25:29][D][sensor:126]: 'jk-bms cell voltage 8': Sending state 3.40300 V with 3 decimals of accuracy
[17:25:29][D][sensor:126]: 'jk-bms min cell voltage': Sending state 3.40000 V with 3 decimals of accuracy
[17:25:29][D][sensor:126]: 'jk-bms max cell voltage': Sending state 3.40500 V with 3 decimals of accuracy
[17:25:29][D][sensor:126]: 'jk-bms delta cell voltage': Sending state 0.00500 V with 3 decimals of accuracy
[17:25:29][D][sensor:126]: 'jk-bms average cell voltage': Sending state 3.40237 V with 3 decimals of accuracy
[17:25:29][D][sensor:126]: 'jk-bms power tube temperature': Sending state 30.00000 °C with 0 decimals of accuracy
[17:25:29][D][sensor:126]: 'jk-bms temperature sensor 1': Sending state 30.00000 °C with 0 decimals of accuracy
[17:25:29][D][sensor:126]: 'jk-bms temperature sensor 2': Sending state 28.00000 °C with 0 decimals of accuracy
[17:25:29][D][sensor:126]: 'jk-bms total voltage': Sending state 27.22000 V with 2 decimals of accuracy
[17:25:29][D][sensor:126]: 'jk-bms current': Sending state 0.50000 A with 2 decimals of accuracy
[17:25:29][D][sensor:126]: 'jk-bms power': Sending state 13.61000 W with 2 decimals of accuracy
[17:25:29][D][sensor:126]: 'jk-bms charging power': Sending state 13.61000 W with 2 decimals of accuracy
[17:25:29][D][sensor:126]: 'jk-bms discharging power': Sending state 0.00000 W with 2 decimals of accuracy
[17:25:29][D][sensor:126]: 'jk-bms capacity remaining': Sending state 99.00000 % with 0 decimals of accuracy
[17:25:29][D][sensor:126]: 'jk-bms charging cycles': Sending state 24.00000 with 0 decimals of accuracy
[17:25:29][D][sensor:126]: 'jk-bms actual battery capacity': Sending state 256.00000 Ah with 0 decimals of accuracy
[17:25:29][D][text_sensor:067]: 'jk-bms manufacturer': Sending state ### 'Input UserdaPrvni set 24'
[17:25:29][D][sensor:126]: 'jk-bms protocol version': Sending state 1.00000 with 0 decimals of accuracy
[17:25:31][I][jk_bms:062]: Status frame received
[17:25:31][D][sensor:126]: 'jk-bms cell voltage 1': Sending state 3.40200 V with 3 decimals of accuracy
[17:25:31][D][sensor:126]: 'jk-bms cell voltage 2': Sending state 3.40300 V with 3 decimals of accuracy
[17:25:31][D][sensor:126]: 'jk-bms cell voltage 3': Sending state 3.40100 V with 3 decimals of accuracy
[17:25:31][D][sensor:126]: 'jk-bms cell voltage 4': Sending state 3.40200 V with 3 decimals of accuracy
[17:25:31][D][sensor:126]: 'jk-bms cell voltage 5': Sending state 3.39800 V with 3 decimals of accuracy
[17:25:31][D][sensor:126]: 'jk-bms cell voltage 6': Sending state 3.40300 V with 3 decimals of accuracy
[17:25:31][D][sensor:126]: 'jk-bms cell voltage 7': Sending state 3.40200 V with 3 decimals of accuracy
[17:25:31][D][sensor:126]: 'jk-bms cell voltage 8': Sending state 3.40300 V with 3 decimals of accuracy
[17:25:31][D][sensor:126]: 'jk-bms min cell voltage': Sending state 3.39800 V with 3 decimals of accuracy
[17:25:31][D][sensor:126]: 'jk-bms max cell voltage': Sending state 3.40300 V with 3 decimals of accuracy
[17:25:31][D][sensor:126]: 'jk-bms delta cell voltage': Sending state 0.00500 V with 3 decimals of accuracy
[17:25:31][D][sensor:126]: 'jk-bms average cell voltage': Sending state 3.40175 V with 3 decimals of accuracy
[17:25:31][D][sensor:126]: 'jk-bms current': Sending state 1.48000 A with 2 decimals of accuracy
[17:25:31][D][sensor:126]: 'jk-bms power': Sending state 40.27080 W with 2 decimals of accuracy
[17:25:31][D][sensor:126]: 'jk-bms charging power': Sending state 40.27080 W with 2 decimals of accuracy
[17:25:31][D][sensor:126]: 'jk-bms discharging power': Sending state 0.00000 W with 2 decimals of accuracy
[17:25:31][D][sensor:126]: 'jk-bms capacity remaining': Sending state 100.00000 % with 0 decimals of accuracy
[17:25:31][D][sensor:126]: 'jk-bms charging cycles': Sending state 6.00000 with 0 decimals of accuracy
[17:25:31][D][sensor:126]: 'jk-bms total charging cycle capacity': Sending state 1792.00000 Ah with 0 decimals of accuracy
[17:25:31][D][sensor:126]: 'jk-bms errors bitmask': Sending state 0.00000 with 0 decimals of accuracy
[17:25:31][D][text_sensor:067]: 'jk-bms errors': Sending state ''
[17:25:31][D][sensor:126]: 'jk-bms current calibration': Sending state 1.23400 A with 3 decimals of accuracy
[17:25:31][D][sensor:126]: 'jk-bms total runtime': Sending state 234.66667 h with 0 decimals of accuracy
[17:25:31][D][text_sensor:067]: 'jk-bms total runtime formatted': Sending state '9d 18h'
[17:25:31][D][sensor:126]: 'jk-bms actual battery capacity': Sending state 256.00000 Ah with 0 decimals of accuracy
[17:25:31][D][text_sensor:067]: 'jk-bms manufacturer': Sending state ### 'Input UserdaDruhy set 24'
[17:25:31][D][sensor:126]: 'jk-bms protocol version': Sending state 1.00000 with 0 decimals of accuracy
[17:25:36][I][jk_bms:062]: Status frame received

[syssi]

Could you provide your config yaml? I would like to reproduce the issue. Did you wire all IDs correctly?

[vrabi-cv]

Here it is
ESPhome program_wemos D1mini_2x24V.txt

[syssi]

We should name the sensors / entities properly. Could you try something like this:

substitutions:
  name: jk-bms
  name_bms0: "${name} bms0"
  name_bms1: "${name} bms1"
  device_description: "Monitor and control a JK-BMS via UART-TTL"
  external_components_source: github://syssi/esphome-jk-bms@main
  tx_pin: GPIO1
  rx_pin: GPIO3
  tx_pin2: GPIO4
  rx_pin2: GPIO5

esphome:
  name: ${name}
  comment: ${device_description}
  project:
    name: "syssi.esphome-jk-bms"
    version: 1.2.0

esp8266:
  board: d1_mini

external_components:
  - source: ${external_components_source}
    refresh: 0s

wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password

ota:
logger:
  baud_rate: 0

mqtt:
  broker: !secret mqtt_host
  username: !secret mqtt_username
  password: !secret mqtt_password
  id: mqtt_client

uart:
  - id: uart0
    baud_rate: 115200
    rx_buffer_size: 384
    tx_pin: ${tx_pin}
    rx_pin: ${rx_pin}
  - id: uart1
    baud_rate: 115200
    rx_buffer_size: 384
    tx_pin: ${tx_pin2}
    rx_pin: ${rx_pin2}

jk_modbus:
  - id: modbus0
    uart_id: uart0
  - id: modbus1
    uart_id: uart1

jk_bms:
  - id: bms0
    jk_modbus_id: modbus0
  - id: bms1
    jk_modbus_id: modbus1

binary_sensor:
  - platform: jk_bms
    jk_bms_id: bms0
    balancing:
      name: "${name_bms0} balancing"
    charging:
      name: "${name_bms0} charging"
    # ...

  - platform: jk_bms
    jk_bms_id: bms1
    balancing:
      name: "${name_bms1} balancing"
    charging:
      name: "${name_bms1} charging"
    # ...

sensor:
  - platform: jk_bms
    jk_bms_id: bms0
    total_voltage:
      name: "${name_bms0} total voltage"
    current:
      name: "${name_bms0} current"
    power:
      name: "${name_bms0} power"
    # ...

  - platform: jk_bms
    jk_bms_id: bms1
    total_voltage:
      name: "${name_bms1} total voltage"
    current:
      name: "${name_bms1} current"
    power:
      name: "${name_bms1} power"
    # ...

[vrabi-cv]

this one is perfect. Now I can see both of them, each has got its own name.
Thanks a lot!