Multiple water meters with a single ESP

[tomav]

Hi @zibous, thanks for this project, works great! 👏

I was wondering if there was a way to collect data from 2 water meters (with different IDs) with a single ESP32? I suppose it is but can't find an example.

Other question: have you noticed different data between what's on the physical water meter and the data retreived via RF?

Thanks.

[zibous]

Hi,

Add for each watermeter a platform: wmbus section with the meter_id see: https://github.com/zibous/ha-watermeter/blob/master/esphome/wm-d1mini-simple.yaml

 - platform: wmbus
    # watermeter 1: nearly to mine
    meter_id: 0x43410778
    type: izar
    add_prefix: True
    # get the total watermter m3 from the wmbus telegram
    total_water_m3:
      name: "Watermeter"
      unit_of_measurement: "m³"
      state_class: total_increasing
      device_class: "water"
      accuracy_decimals: 3
      icon: mdi:counter

  - platform: wmbus
    # watermeter 3: nearly to mine
    meter_id: 0x43890785
    type: izar
    add_prefix: True
    # get the total watermter m3 from the wmbus telegram
    total_water_m3:
      name: "Watermeter"
      unit_of_measurement: "m³"
      state_class: total_increasing
      device_class: "water"
      accuracy_decimals: 3
      icon: mdi:counter

Other question: have you noticed different data between what's on the physical water meter and the data retreived via RF?

For my IZAR no, same as with wmbusmeters.

[tomav]

Thanks, that was straightforward! I can notice an offset of 165L between my water meter and what I get from the ESP, but the offset seems consistent overtime so not an issue.

[zibous]

I can notice an offset of 165L between my water meter

interesting, because IZAR always sends data in 8sec intervals, unless a heartbeat filter is used.

      # Send the value periodically with the specified time interval.
      # If the sensor value changes during the interval the interval will not reset.
      # The last value of the sensor will be sent. 60s means, that every minute the
      # last state will be published.
      # The IZAR Watermeter will publish data all 8s (see transmit_period_s),
      # but we need this only evers minute.
      # filters:
      #   - heartbeat: 60s

With my water meter, the values are identical to the analog display: