KratosMr
October 20, 2023, 8:56am
1
Hi, I used custom components to read rs232 data from a weighing scale through esp8266 using max232 mini board. By esphome logs I can see the correct continuous serial data, but I cannot display the values as a sensor in homeassistant. my need is to continuously update the homeassistant sensor using the text sensor serial data. Any help is highly appreciated.
esphome:
name: a12e
platform: ESP8266 # Use ESP32 if applicable
board: nodemcuv2 # Adjust this according to your ESP module
includes:
- uart_read_line_sensor.h
wifi:
ssid:
password:
logger:
api:
encryption:
key:
ota:
password:
uart:
id: uart_bus
tx_pin: GPIO15
rx_pin: GPIO13
baud_rate: 9600
text_sensor:
- platform: custom
lambda: |-
auto my_custom_sensor = new UartReadLineSensor(id(uart_bus));
App.register_component(my_custom_sensor);
return {my_custom_sensor};
text_sensors:
id: "uart_readline"
1 Like
zoogara
October 20, 2023, 10:23am
2
HI and welcome to HA. Can you please post your logs as well?
KratosMr
October 21, 2023, 6:06pm
4
Hi Daryl, This is the ESPHome Log I’m getting
[23:28:33][C][uart.arduino_esp8266:102]: UART Bus:
[23:28:33][C][uart.arduino_esp8266:103]: TX Pin: GPIO15
[23:28:33][C][uart.arduino_esp8266:104]: RX Pin: GPIO13
[23:28:33][C][uart.arduino_esp8266:106]: RX Buffer Size: 256
[23:28:33][C][uart.arduino_esp8266:108]: Baud Rate: 9600 baud
[23:28:33][C][uart.arduino_esp8266:109]: Data Bits: 8
[23:28:33][C][uart.arduino_esp8266:110]: Parity: NONE
[23:28:33][C][uart.arduino_esp8266:111]: Stop bits: 1
[23:28:33][C][uart.arduino_esp8266:115]: Using software serial
[23:28:33][C][mdns:108]: mDNS:
[23:28:33][C][mdns:109]: Hostname: a12e
[23:28:33][C][ota:093]: Over-The-Air Updates:
[23:28:33][C][ota:094]: Address: a12e.local:8266
[23:28:33][C][ota:097]: Using Password.
[23:28:33][C][api:138]: API Server:
[23:28:33][C][api:139]: Address: a12e.local:6053
[23:28:33][C][api:141]: Using noise encryption: YES
[23:29:19][D][text_sensor:064]: 'uart_readline': Sending state '\xffww-135.60kg'
[23:29:19][D][text_sensor:064]: 'uart_readline': Sending state 'ww-135.60kg'
[23:29:19][D][text_sensor:064]: 'uart_readline': Sending state 'ww-135.60kg'
[23:29:19][D][text_sensor:064]: 'uart_readline': Sending state 'ww-135.60kg'
[23:29:19][D][text_sensor:064]: 'uart_readline': Sending state 'ww-135.60kg'
[23:29:19][D][text_sensor:064]: 'uart_readline': Sending state 'ww-135.60kg'
[23:29:19][D][text_sensor:064]: 'uart_readline': Sending state 'ww-135.60kg'
[23:29:20][D][text_sensor:064]: 'uart_readline': Sending state 'ww-135.60kg'
ESP Uart reads the same weight as displayed in the scale.
KratosMr
October 21, 2023, 7:38pm
5
By figuring the below configuration the values got exposed in homeassistant.
internal (Optional , boolean): Mark this component as internal. Internal components will not be exposed to the frontend (like Home Assistant). Only specifying an id without a name will implicitly set this to true.
I added the name for the text sensor in the code.
text_sensor:
- platform: custom
lambda: |-
auto my_custom_sensor = new UartReadLineSensor(id(uart_bus));
App.register_component(my_custom_sensor);
return {my_custom_sensor};
text_sensors:
name: "Weight Machine"
id: "uart_readline"
Now I’m trying to separate ‘ww’ text from the output.
KratosMr
October 21, 2023, 9:43pm
6
Finally managed to remove the ‘ww’ preffix and converted the string to float, this is my final esphome code.
uart:
id: uart_bus
tx_pin: GPIO15
rx_pin: GPIO13
baud_rate: 9600
text_sensor:
- platform: custom
lambda: |-
auto my_custom_sensor = new UartReadLineSensor(id(uart_bus));
App.register_component(my_custom_sensor);
return {my_custom_sensor};
text_sensors:
filters:
- substitute:
- "ww -> "
id: "uart_readline"
sensor:
- platform: template
update_interval: 1s
name: "Weight"
id: weight_sensor
unit_of_measurement: "Kg"
lambda: |-
std::string x = id(uart_readline).state;
return atof(x.c_str());
1 Like
Do you mind to share your custom components.
KratosMr
July 12, 2025, 9:04am
8
I moved away from custom component since it was causing lots of issue.
uart:
tx_pin: GPIO17
rx_pin: GPIO16
baud_rate: 9600
debug:
direction: RX
dummy_receiver: true
after:
delimiter: "\r\n"
sequence:
- lambda: |-
std::string str(bytes.begin(), bytes.end());
id(uart_readline).publish_state(str.c_str());
text_sensor:
- platform: template
#name: "Raw String"
id: "uart_readline"
filters:
- substitute:
- "ww -> "
sensor:
- platform: template
update_interval: 1s
name: "Weight"
id: weight_sensor
unit_of_measurement: "Kg"
lambda: |-
std::string x = id(uart_readline).state;
return atof(x.c_str());
Thank you for your sharing.
I have tried the code given. but not luck yet for me.
Then I try to change the UART sequence as recommended by esphome doc and adjust the delimiter as below.
uart:
then only the shows some value like below, but I dont know how to generate the sensor so that it can get the value from there.
[15:35:57][C][logger:246]: Logger:
