Earlier this year I put up a Raspberry Pi powered DAKboard display. It shows photos from our Google Photos albums, the time and weather, and most importantly; our shared calendar.

But I’d like it to show some custom data as well β€” like indoor temperature and humidity. And the measured outdoor temperature, not just the one reported from the weather service.

Here is how I did that β€” using Home Assistant πŸ‘‡

Home Assistant

For DAKboard to access data from my Home Assistant; it needs access to the API. So first we need to create an API token for it. In Home Assistant, navigate to:

Profile -> Long-Lived Access Tokens -> Create

Make sure to write it down, it will only be shown once.

Your Home Assistant instance has to be accessible from outside your home network β€” for DAKboard to reach it.

To show multiple sensor data within a single DAKboard block; it needs to be parts of the same API response. Some sensors, like the Netatmo, have different endpoint for its values.

But we can combine them using a template sensor:

template:
  - sensor:
    - name: netatmo_2etg
      state: "{{ states.sensor.netatmo_2_etg_temperature.state }}"
      attributes:
        temp: "{{ states.sensor.netatmo_2_etg_temperature.state }}"
        humid: "{{ states.sensor.netatmo_2_etg_humidity.state }}"
        co2: "{{ states.sensor.netatmo_2_etg_co2.state }}"

The API URL for the sensor above is:

http://IP-OR-HOST:8123/api/states/sensor.netatmo_2etg

If we make a GET call to that URL, as described in the documentation, we get the following response:

{
  "entity_id": "sensor.netatmo_2etg",
  "state": "19.6",
  "attributes": {
    "temp": 19.6,
    "humid": 61,
    "co2": 1496,
    "friendly_name": "netatmo_2etg"
  },
  "last_changed": "2021-09-18T07:58:03.657143+00:00",
  "last_updated": "2021-09-18T08:09:03.675011+00:00",
  "context": {
    "id": "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
    "parent_id": null,
    "user_id": null
  }
}

Nice, now onto DAKboard…

DAKBoard

On your custom screen, add a new block:

Add a Block -> External Data/JSON

  • Set Authorization Type to Bearer Token
  • Enter the API token we created earlier
  • Click the play button (▢️) to refresh the data
    • The data points in the API response is now available for selection
  • Select data points to show in your DAKboard block
External data block configuration

My layout

My DAKboard block layout

In my layout, I’m using the following external data blocks:

And here is our custom DAKboard screen:

My DAKboard screen

Closing thoughts

Using Home Assistant as the data source for things like this is awesome. Home Assistant can pull data from so many sources, and customize it if necessary.

With DAKboard there is limited formatting and calculation options. But using Home Assistant’s sensor templates; you can do a lot of those things πŸ™‚

The only challenge now is to refrain from completely cluttering the layout with custom data πŸ˜›