Serial Sensor - "Regex" Data

Configuration
1

Hi guys, I am a little bit frustrated right now, but let me explain!

at first: If this thread is in the wrong chapter, please move it to the correct one!

I am able to receive data through serial port from sensor, this is working!
Now I want to extract the values from this string via templating.

What I have:
sensor:

  • platform: serial
    serial_port: /dev/ttyUSB0
    name: smartmeter_data
    baudrate: 9600
    bytesize: 7
    parity: E
    stopbits: 1
  • platform: template
    sensors:
    smartmeter_total:
    unit_of_measurement: “kWh”
    value_template: >
    {% if states(‘sensor.smartmeter_data’)|regex_search(“1-0:1.8.0255") %}
    {{ states(‘sensor.smartmeter_data’)|regex_findall_index("((\d    .\d*))”) | float }}
    {% else %}
    {{ ‘sensor.smartmeter_data’ }}
    {% endif %}

The received string is looking like that:
1-0:0.0.0255(hidden_serialnumber)
1-0:96.1.0255(hidden_serialnumber)
1-0:1.8.0255(000021kWh)
1-0:2.8.0255(000004kWh)
1-0:96.5.0255(001C0104)
0-0:96.8.0255(0002DC73)

The result on the dashboard is “unknown” for “smartmeter_total”

What I am doing wrong?

Thanks for your help in advance!

2

From the FAQ: Format your code

This line in your template doesn’t return the sensor’s value:

{{ 'sensor.smartmeter_data' }}

Change it to this:

{{ states('sensor.smartmeter_data') }}

Reference: Templating - States

In addition, your template’s regex pattern produces more than one matching value.

Screenshot_20230605-142002~2
Screenshot_20230605-142002~21157×329 33.1 KB

The float filter cannot process multiple values so it will result in an error (and that’s why the sensor’s value is unknown).

3

I suggest you try this template:

    value_template: >
      {% set sd = states('sensor.smartmeter_data') %}
      {% if '1-0:1.8.0255' in sd %}
        {{ sd[13:-4] | float(0) }}
      {% else %}
        {{ sd }}
      {% endif %}
4

Thanks for your suggestion, but its a little bit strange, the result is still “unknown”

5

Start by posting a properly formatted version of your sensor’s YAML configuration. Without that, we are unable to check it for YAML syntax errors.