How to calculate total water consumption in ESPHome when calibration for flow rate is used?

ESPHome
,
1

Using without calibration is wrong, due to the sensor readings vary significantly depending on the flow rate. Using the same calibration for total is also wrong - it breaks calculation at all.

Using two YF-S402B with individual calibrations on water flow rate and stock configuration with fixed ratio is very erroneous (with calibration they are much more accurate).

  • How do I make the total calculate based on actual flow rate calibrated data?
  • Is separate calibration necessary (I don’t understand how to produce it mathematically), and is it possible to do without it?

Thanks!

sensor:
  - platform: pulse_counter 
    id: "raw_water"
    name: "Input (actual)"
    pin: GPIO12 
    update_interval: ${update_interval}
    accuracy_decimals: 3
    force_update: True
    unit_of_measurement: L/min
    device_class: water
    state_class: measurement
    entity_category: "diagnostic"
    filters:
      - calibrate_linear:
          method: exact
          datapoints:
            - 0 -> 0
            - 149 -> 0
            - 445 -> 0.299
            - 1174 -> 0.643
            - 2102 -> 1.134
            - 2453 -> 1.262
            - 2642 -> 1.310
            - 2730 -> 1.350
            - 2883 -> 1.434
            - 3052 -> 1.469
            - 3540 -> 1.535
            - 4000 -> 1.600
    total:
      id: "raw_water_total"
      name: "Input"
      accuracy_decimals: 3
      unit_of_measurement: L
      filters:
            ???
2

That would be quite complicated. Total is just a counter of the pulses your meter outputs, it doesn’t consider how fast or slow they come or what calibrations you make on pulse_counter.
You need to build your own Total, for example you could set pulse_counter update interval to 1s and use on_value automation to add corresponding quantity to template sensor or global variable. For example if your flow is 15L/min, you add 0.25L to the counter. That might work if you have simple esphome setup and not any component is hanging the update intervals.

1 Like
3

I was wary of options like this, as they feel like crutches.
But at least it could be a way out of the situation, thank you!