BD6A20S10P doesn't respond using UART-TTL

[DominikZL]

BD6A20S10P HW 11A SW 11.52, I can't estabilish communication on GPS port. Tested on ESP2866 NodeMCU v3 with esp8266-example.yaml. Here is log:

INFO ESPHome 2024.10.3
INFO Reading configuration /config/jk-bms.yaml...
INFO Updating https://github.com/syssi/esphome-jk-bms.git@main
INFO Starting log output from 192.168.1.100 using esphome API
INFO Successfully connected to jk-bms @ 192.168.1.100 in 0.006s
INFO Successful handshake with jk-bms @ 192.168.1.100 in 0.013s
[16:27:38][I][app:100]: ESPHome version 2024.10.3 compiled on Dec  5 2024, 17:10:14
[16:27:38][I][app:102]: Project syssi.esphome-jk-bms version 2.1.0
[16:27:38][C][wifi:600]: WiFi:
[16:27:38][C][wifi:428]:   Local MAC: 24:D7:EB:C8:FC:31
[16:27:38][C][wifi:433]:   SSID: 'Obornicka 253'[redacted]
[16:27:38][C][wifi:436]:   IP Address: 192.168.1.100
[16:27:38][C][wifi:439]:   BSSID: B0:4E:26:88:FC:F4[redacted]
[16:27:38][C][wifi:441]:   Hostname: 'jk-bms'
[16:27:38][C][wifi:443]:   Signal strength: -65 dB ▂▄▆█
[16:27:38][C][wifi:447]:   Channel: 11
[16:27:38][C][wifi:448]:   Subnet: 255.255.255.0
[16:27:38][C][wifi:449]:   Gateway: 192.168.1.1
[16:27:38][C][wifi:450]:   DNS1: 192.168.1.1
[16:27:38][C][wifi:451]:   DNS2: 8.8.8.8
[16:27:38][C][logger:185]: Logger:
[16:27:38][C][logger:186]:   Level: DEBUG
[16:27:38][C][logger:188]:   Log Baud Rate: 0
[16:27:38][C][logger:189]:   Hardware UART: UART0
[16:27:38][C][uart.arduino_esp8266:118]: UART Bus:
[16:27:38][C][uart.arduino_esp8266:119]:   TX Pin: GPIO1
[16:27:38][C][uart.arduino_esp8266:120]:   RX Pin: GPIO3
[16:27:38][C][uart.arduino_esp8266:122]:   RX Buffer Size: 384
[16:27:38][C][uart.arduino_esp8266:124]:   Baud Rate: 115200 baud
[16:27:38][C][uart.arduino_esp8266:125]:   Data Bits: 8
[16:27:38][C][uart.arduino_esp8266:126]:   Parity: NONE
[16:27:38][C][uart.arduino_esp8266:127]:   Stop bits: 1
[16:27:38][C][uart.arduino_esp8266:129]:   Using hardware serial interface.
[16:27:38][C][jk_modbus:113]: JkModbus:
[16:27:38][C][jk_modbus:114]:   RX timeout: 50 ms
[16:27:38][C][jk_bms:545]: JkBms:
[16:27:38][C][jk_bms:546]:   Address: 0x4E
[16:27:38][C][jk_bms:547]: Minimum Cell Voltage 'jk-bms min cell voltage'
[16:27:38][C][jk_bms:547]:   Device Class: 'voltage'
[16:27:38][C][jk_bms:547]:   State Class: 'measurement'
[16:27:38][C][jk_bms:547]:   Unit of Measurement: 'V'
[16:27:38][C][jk_bms:547]:   Accuracy Decimals: 3
[16:27:38][C][jk_bms:548]: Maximum Cell Voltage 'jk-bms max cell voltage'
[16:27:38][C][jk_bms:548]:   Device Class: 'voltage'
[16:27:38][C][jk_bms:548]:   State Class: 'measurement'
[16:27:38][C][jk_bms:548]:   Unit of Measurement: 'V'
[16:27:38][C][jk_bms:548]:   Accuracy Decimals: 3
[16:27:38][C][jk_bms:549]: Minimum Voltage Cell 'jk-bms min voltage cell'
[16:27:38][C][jk_bms:549]:   State Class: 'measurement'
[16:27:38][C][jk_bms:549]:   Unit of Measurement: ''
[16:27:38][C][jk_bms:549]:   Accuracy Decimals: 0
[16:27:38][C][jk_bms:549]:   Icon: 'mdi:battery-minus-outline'
[16:27:38][C][jk_bms:550]: Maximum Voltage Cell 'jk-bms max voltage cell'
[16:27:38][C][jk_bms:550]:   State Class: 'measurement'
[16:27:38][C][jk_bms:550]:   Unit of Measurement: ''
[16:27:38][C][jk_bms:550]:   Accuracy Decimals: 0
[16:27:38][C][jk_bms:550]:   Icon: 'mdi:battery-plus-outline'
[16:27:38][C][jk_bms:551]: Delta Cell Voltage 'jk-bms delta cell voltage'
[16:27:38][C][jk_bms:551]:   Device Class: 'voltage'
[16:27:38][C][jk_bms:551]:   State Class: 'measurement'
[16:27:38][C][jk_bms:551]:   Unit of Measurement: 'V'
[16:27:38][C][jk_bms:551]:   Accuracy Decimals: 3
[16:27:38][C][jk_bms:552]: Average Cell Voltage 'jk-bms average cell voltage'
[16:27:38][C][jk_bms:552]:   Device Class: 'voltage'
[16:27:38][C][jk_bms:552]:   State Class: 'measurement'
[16:27:38][C][jk_bms:552]:   Unit of Measurement: 'V'
[16:27:38][C][jk_bms:552]:   Accuracy Decimals: 3
[16:27:38][C][jk_bms:553]: Cell Voltage 1 'jk-bms cell voltage 1'
[16:27:38][C][jk_bms:553]:   Device Class: 'voltage'
[16:27:38][C][jk_bms:553]:   State Class: 'measurement'
[16:27:38][C][jk_bms:553]:   Unit of Measurement: 'V'
[16:27:38][C][jk_bms:553]:   Accuracy Decimals: 3
[16:27:38][C][jk_bms:554]: Cell Voltage 2 'jk-bms cell voltage 2'
[16:27:38][C][jk_bms:554]:   Device Class: 'voltage'
[16:27:38][C][jk_bms:554]:   State Class: 'measurement'
[16:27:38][C][jk_bms:554]:   Unit of Measurement: 'V'
[16:27:38][C][jk_bms:554]:   Accuracy Decimals: 3
[16:27:38][C][jk_bms:555]: Cell Voltage 3 'jk-bms cell voltage 3'
[16:27:38][C][jk_bms.switch:068]: JkBms Switch 'jk-bms charging'
[16:27:38][C][jk_bms.switch:070]:   Icon: 'mdi:battery-charging-50'
[16:27:38][C][jk_bms.switch:090]:   Restore Mode: always OFF
[16:27:38][C][jk_bms.switch:068]: JkBms Switch 'jk-bms discharging'
[16:27:38][C][jk_bms.switch:070]:   Icon: 'mdi:battery-charging-50'
[16:27:38][C][jk_bms.switch:090]:   Restore Mode: always OFF
[16:27:38][C][mdns:116]: mDNS:
[16:27:38][C][mdns:117]:   Hostname: jk-bms
[16:27:38][C][esphome.ota:073]: Over-The-Air updates:
[16:27:38][C][esphome.ota:074]:   Address: jk-bms.local:8266
[16:27:38][C][esphome.ota:075]:   Version: 2
[16:27:38][C][safe_mode:018]: Safe Mode:
[16:27:38][C][safe_mode:019]:   Boot considered successful after 60 seconds
[16:27:38][C][safe_mode:021]:   Invoke after 10 boot attempts
[16:27:38][C][safe_mode:022]:   Remain in safe mode for 300 seconds
[16:27:38][C][api:140]: API Server:
[16:27:38][C][api:141]:   Address: jk-bms.local:6053
[16:27:38][C][api:145]:   Using noise encryption: NO
[16:27:41][D][uart_debug:114]: >>> 4E:57:00:13:00:00:00:00:06:02:00:00:00:00:00:00:68:00:00:01:28
[16:27:46][D][uart_debug:114]: >>> 4E:57:00:13:00:00:00:00:06:02:00:00:00:00:00:00:68:00:00:01:28
[16:27:51][D][uart_debug:114]: >>> 4E:57:00:13:00:00:00:00:06:02:00:00:00:00:00:00:68:00:00:01:28
[16:27:56][D][uart_debug:114]: >>> 4E:57:00:13:00:00:00:00:06:02:00:00:00:00:00:00:68:00:00:01:28
[16:28:01][D][uart_debug:114]: >>> 4E:57:00:13:00:00:00:00:06:02:00:00:00:00:00:00:68:00:00:01:28
[16:28:06][D][uart_debug:114]: >>> 4E:57:00:13:00:00:00:00:06:02:00:00:00:00:00:00:68:00:00:01:28
[16:28:11][D][uart_debug:114]: >>> 4E:57:00:13:00:00:00:00:06:02:00:00:00:00:00:00:68:00:00:01:28
[16:28:16][D][uart_debug:114]: >>> 4E:57:00:13:00:00:00:00:06:02:00:00:00:00:00:00:68:00:00:01:28

[syssi]

Could you assign GPIO4 and GPIO5 to the uart component and connect the GPS port of the BMS to these pins and give it another try? There is probably a USB-to-TTL converter attached to GPIO1/GPIO3 of your devboard and the JK-BMS is pretty picky here. Furthermore I recommend to use a ESP32 because of the large amont of sensors and better accessible hardware UART.