How to get graphs for temperature from KNX

Configuration
1

I read in-house temperature frm my KNX domotics systems, this works fine, i get the right value.
How can i get a graph instead of the bar:

Anyone has a solution ?

1 Like
2

Add a unit_of_measurement.

3

When i add it to the sensor i get following error:

16-10-31 09:08:40 root: KNX/IP gateway did not respond to connect request
16-10-31 09:08:40 homeassistant.bootstrap: component knx failed to initialize

Working config, but without unit_of_measurement: ‘°C’

  - platform: knx
    name: Temperatuur boven
    type: temperature
    address: 5/4/2
4

So you need a Template sensor if the platform does not support it.

5

Got it working with template sensor:

sensor:
 - platform: knx
     name: knx_temp_boven
     type: temperature
     address: 5/4/2

- platform: template
    sensors:
      temp_boven:
        # Convert to °C
        value_template: '{{ states.sensor.knx_temp_boven.state }}'
        friendly_name: 'Temperatuur boven'
        unit_of_measurement: '°C'

Many thanks for your help !

6

I am trying getting it cleaner to floating point and 1 decimal:

- platform: template
  sensors:
    temp_boven:
      # Convert to °C
      value_template: '{{ states.sensor.knx_temp_boven.state | round (1) | float }}'
      friendly_name: 'Temperatuur boven'
      unit_of_measurement: '°C'

Now i get this error in the log:
16-10-31 15:59:46 homeassistant.components.sensor.template: UndefinedError: ‘None’ has no attribute ‘state’

7

And another issue, i now have a graph, but it is not updating:

The log shows:
16-10-31 17:21:34 root: KNX/IP gateway did not respond to connect request
16-10-31 17:21:37 homeassistant.core: Error inside async loop: Task exception was never retrieved
16-10-31 17:22:02 homeassistant.core: Error inside async loop: Task exception was never retrieved
16-10-31 17:22:02 homeassistant.core: Error inside async loop: Task exception was never retrieved
16-10-31 17:22:32 homeassistant.core: Error inside async loop: Task exception was never retrieved
…

8

I used another KNX IP gateway and now KNX connection seems stable…
Also modified config of template to:

  - platform: template
    sensors:
      temp_boven:
        # Convert to °C
        value_template: >-
          {% if states.sensor.knx_temp_boven %}
            {{ states.sensor.knx_temp_boven.state | round (1) | float }}
          {% else %}
            n/a
          {% endif %}
        friendly_name: 'Temperatuur boven'
        unit_of_measurement: '°C'

This avoid errors in the log file at restart:

16-10-31 15:59:46 homeassistant.components.sensor.template: UndefinedError: 'None' has no attribute 'state'
9

Still some issue: graph goes to 0 on every reboot.
How to avoid this ?

10

I am having the same issue and I added the unit of measurement but still no graph displayed.
This is my sensor template:

garage_maison_wifi_signal_strength:
  friendly_name: 'Force du signal WiFi (dB)'
  value_template: '{{ states.cover.garage_maison.attributes["wifi signal strength (dB)"] }}'
  unit_of_measurement: 'dB'