Uart Text Sensor (Hexadecimal to decimal)

[lnapalm99]

Hi everybody, I’m pretty new on HA and EspHome. I have a sensor that returns 5 characters through uart in hexadecimal format, for example the ascii characters 00500 → 30:30:35:30:30 in hexa. I need to compare these values and change the state of a GPIO, but for that I need them to be in decimal format and be readable by HA. Is there any form to change these values from Hexa to Decimal? I am using UART Text Sensor.

Here is my yaml file:

esphome:

  name: serial-inficon

  friendly_name: serial_inficon

  includes:

    - datos/uart_read_line_sensor.h

esp8266:

  board: nodemcuv2

# Example configuration entry

web_server:

  port: 80

# Enable logging

logger:

  level: VERBOSE #makes uart stream available in esphome logstream

  baud_rate: 0 #disable logging over uart

# Enable Home Assistant API

api:

  encryption:

    key: "xxxxxxxxxxxx"

ota:

  password: "xxxxxxx"

wifi:

  ssid: !secret wifi_ssid

  password: !secret wifi_password

  # Enable fallback hotspot (captive portal) in case wifi connection fails

  ap:

    ssid: "Serial-Inficon Fallback Hotspot"

    password: "xxxxxx"

captive_portal:

uart:

  id: uart_bus

  tx_pin: GPIO1

  rx_pin: GPIO3

  baud_rate: 9600

  debug:

    direction: BOTH

    dummy_receiver: false

interval:

  - interval: 10s

    then:

      - uart.write: '%'

     

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"    

   

switch:

  - platform: uart

    name: "Send_R"

    data: 'R'

   

binary_sensor:

  - platform: gpio

    pin: GPIO13

    name: serial1

    device_class: motion

  - platform: gpio

    pin: GPIO15

    name: serial2

    device_class: motion

In the image you can see the responses I get from the sensor (30:30:30:30:30). I need to change that data to Decimal, it should be 00000. The lambda publishes the state of the buffer. Any Ideas how to do that?

[mulcmu]

Take a look at this post for example conversion of the hexadecimal vector into a text string and also processing the response to update sensors.

[lnapalm99]

Hello mulcmu, I tried your aproach but I get a lot of “trash data” like numbers and “???” in RawString template even when I am not requesting the info from the sensor. The closest I got was with the UART readline but I can’t parse the info I get from the custom sensor, I tried to get the position I need from the buffer and compare it with a value to trigger a binary sensor but I cant get it.

I think it is something of the sensor, because I tried your program with an Arduino sending data through serial and receiving with an ESP and it works.

[mulcmu]

Could you post the yaml that is giving the “trash data” and I’ll take a look at it?

[lnapalm99]

Hello again, thanks for replying. Each time I send “%” sensor will reply with the measure value. But now I keep getting all that data. Here is the Yaml.

esphome:
  name: serial-inficon
  friendly_name: serial_inficon
  includes:
   # - datos/uart_read_line_sensor.h
#    - datos/my_custom_component.h

esp8266:
  board: nodemcuv2

# Example configuration entry
web_server:
  port: 80

# Enable logging

# Enable Home Assistant API
api:
  encryption:
    key: "xxxxxxxxx"

ota:
  password: "xxxxxxxxxx"

wifi:
  ssid: !xxxxxxxxx  
  password: !xxxxx

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "Serial-Inficon Fallback Hotspot"
    password: "xxxxxx"

captive_portal:

logger:
  baud_rate: 9600

uart:
  baud_rate: 9600
  tx_pin: GPIO1
  rx_pin: GPIO3
  debug:
    direction: RX
    dummy_receiver: true
    after:
      delimiter: "\n"
    sequence:
      - lambda: |-
          UARTDebug::log_string(direction, bytes);  //Still log the data
          
          int sensorID=0;
          float sensorTEMP=0; 
          
          //Example to convert uart text to string
          std::string str(bytes.begin(), bytes.end());

          //watch for potential problems with non printable or special characters in string
          id(rawString).publish_state(str.c_str());
          
        

          //Sample binary / hex data
          if (bytes.size()==9) {
            if(bytes[0]==0x40)
              id(binData).publish_state( bytes[4] );
          }

text_sensor:
  - platform: template
    name: "Raw String"
    id: "rawString"

sensor:
  - platform: template
    name: "Temp 1"
    id: "temp1"
  - platform: template
    name: "Temp 2"
    id: "temp2"
  - platform: template
    name: "Binary Data"
    id: binData


button:
  - platform: template
    name: "Test Button %"
    on_press:
      - uart.write: "%"
  - platform: template
    name: "Test Button R"
    on_press:
      - uart.write: "R"
       

#if you need to send a request periodically to get response from the uart device 
interval:
  - interval: 60s
    then:
      - uart.write:  "%"     

I am trying other options in the logger right now. I removed the part of the temperature sensors from your sketch.

I am 99,9% sure that my sensor is the problem. I need to make some changes then try again. Thank you for your time, I will update news if I have something.

[mulcmu]

@lnapalm99

logger:
  baud_rate: 9600

Looks like the logger got enabled. Put the baud_rate: back to 0

[lnapalm99]

Its working now, THANK YOU so much mulcmu for your help , I get the 5 digit responses as needed.

Thank you again.