Category: Random thoughts

We are live!

the project: https://meetjestad.net/
info: https://meetjestad.net/node/1084
data: https://meetjestad.net/data/sensors_recent.php?sensor=1084&limit=12
json: https://meetjestad.net/data/?type=sensors&ids=1084&format=json&limit=1
Utrecht: https://meetjestad.net/index3.php?loc=Ut
RIVM: https://samenmeten.rivm.nl/dataportaal/sensor_dashboard.php?kit_id=MJS_1084#tabs-2

Of course I wanted to add the data to my own Home Assistant installation. For this I had to add some custom sensors to:
\\NAS\docker\homeassistant\config\configuration.yaml

rest:
  - resource: "https://meetjestad.net/data/?type=sensors&ids=1084&format=json&limit=1"
    scan_interval: 00:15:00
    sensor:
      - name: "mjs_1084_humidity"
        unique_id: mjs_1084_humidity
        value_template: '{{ (value_json[0].humidity | float) | round(1) }}'
        device_class: humidity
        state_class: measurement
        unit_of_measurement: "%"
        availability: '{{ ((value_json[0].humidity | float) >= 0) and ((value_json[0].humidity | float) <= 100) }}'
      - name: "mjs_1084_temperature"
        unique_id: mjs_1084_temperature
        value_template: '{{ (value_json[0].temperature | float) | round(1) }}'
        device_class: temperature
        state_class: measurement
        unit_of_measurement: "°C"
        availability: '{{ ((value_json[0].temperature | float) > -25) and ((value_json[0].temperature | float) < 100) }}'
      - name: "mjs_1084_pm25"
        unique_id: mjs_1084_pm25
        value_template: '{{ (value_json[0]["pm2.5"] | float) | round(0) }}'
        device_class: pm25
        state_class: measurement
        unit_of_measurement: "µg/m³"
        availability: '{{ ((value_json[0]["pm2.5"] | float) >= 0) and ((value_json[0]["pm2.5"] | float) < 50000) }}'
      - name: "mjs_1084_pm10"
        unique_id: mjs_1084_pm10
        value_template: '{{ (value_json[0].pm10 | float) | round(0) }}'
        device_class: pm10
        state_class: measurement
        unit_of_measurement: "µg/m³"
        availability: '{{ ((value_json[0].pm10 | float) >= 0) and ((value_json[0].pm10 | float) < 50000) }}'
      - name: "mjs_1084_battery_voltage"
        unique_id: mjs_1084_battery_voltage
        value_template: '{{ (value_json[0].supply | float) | round(2) }}'
        device_class: voltage
        state_class: measurement
        unit_of_measurement: V
      - name: "mjs_1084_timestamp"
        unique_id: mjs_1084_timestamp
        device_class: timestamp
        value_template: "{{ strptime( value_json[0].timestamp ~ '+00:00' , '%Y-%m-%d %H:%M:%S%z') }}"

* Please note some changes I made, compared to the instructions I found here. The following does not work:

value_template: '{{ (value_json[0].pm2.5 | float) }}'

I had to use:

value_template: '{{ (value_json[0]["pm2.5"] | float) | round(0) }}'

* I added the timestamp as a sensor as well, so I could see when the last data packet was transmitted. For the timestamp, the following did not quite work. It just gave me the UTC time:

value_template: "{{ value_json[0].timestamp | as_datetime | as_local }}"

So, I had to add some string manipulation to get the data in the correct timezone:

value_template: "{{ strptime( value_json[0].timestamp ~ '+00:00' , '%Y-%m-%d %H:%M:%S%z') }}"

* And to filter out invalid data, like temperature at -26 or pm at over 50k, I had to add some availability filters, like so:

availability: '{{ ((value_json[0].pm10 | float) >= 0) and ((value_json[0].pm10 | float) < 50000) }}'

That’s all folks…
Have a nice day!