How to pass a variable from Home Assistant front end to ESPHome?

ESPHome
2

It’s amazing how posting the problem changes my thinking and solves the problem. Here’s the solution below for anyone else with this issue.

In HA, define your input numbers:



koi_water_change:
  name: Water change litres
  icon: mdi:water
  initial: 1000
  min: 0
  max: 1200
  step: 100

drum_wash_timer:
  name: Drum wash time
  icon: mdi:timer
  initial: 5
  min: 0
  max: 20
  step: 1

spindrifter_off_timer:
  name: Spindrifter off timer
  icon: mdi:timer
  initial: 5
  min: 0
  max: 20
  step: 1

Next, define sensor template using the input_numbers:

- platform: template
  sensors:
    koi_water_change:
      value_template: '{{ states.input_number.koi_water_change.state | int }}'
    drum_wash_timer:
      value_template: '{{ states.input_number.drum_wash_timer.state | int }}'
    spindrifter_off_timer:
      value_template: '{{ states.input_number.spindrifter_off_timer.state | int }}'

Lastly, in ESPHome, define the homeassistant sensors:

  - platform: homeassistant
    name: "Water change litres"
    entity_id: sensor.koi_water_change
  
  - platform: homeassistant
    name: "Drum wash timer"
    entity_id: sensor.drum_wash_timer
  
  - platform: homeassistant
    name: "Spindrifter off timer"
    entity_id: sensor.spindrifter_off_timer

Then use the sensor in your ESPHome automation:

        - lambda: |-        
            delay(id("Spindrifter off timer")*60);
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