按照度自适应的百叶：维持桌面 300 lx，而不是固定开合比例

自动化 YAML light-lux-adaptive-blinds.yaml 复制

# HearthNodes recipe 06 - lux adaptive blinds
alias: "Light - closed loop blinds holding 300 lx"
id: hn_light_lux_adaptive_blinds
description: "Desk illuminance loop, 90 s cycle, 12 point maximum step"
mode: single
max_exceeded: silent

trigger:
  - platform: numeric_state
    entity_id: sensor.desk_illuminance
    below: 250
    for: "00:01:30"
  - platform: numeric_state
    entity_id: sensor.desk_illuminance
    above: 400
    for: "00:01:30"

variables:
  target_lx: 300
  deadband_lx: 60
  measured: "{{ states('sensor.desk_illuminance') | float(300) }}"
  current: "{{ state_attr('cover.study_blind','current_position') | int(50) }}"
  error: "{{ measured - target_lx }}"
  raw_step: "{{ (-error / 18) | round(0) }}"
  clamped_step: "{{ [[raw_step, -12] | max, 12] | min }}"
  computed_position: "{{ [[current + clamped_step, 0] | max, 100] | min }}"

condition:
  - condition: numeric_state
    entity_id: sun.sun
    attribute: elevation
    above: 5
  - condition: state
    entity_id: binary_sensor.blind_manual_override
    state: "off"
  - condition: state
    entity_id: binary_sensor.study_window_contact
    state: "off"
  - condition: template
    value_template: "{{ (measured - target_lx) | abs > deadband_lx }}"

action:
  - service: cover.set_cover_position
    target:
      entity_id: cover.study_blind
    data:
      position: "{{ computed_position }}"
  - service: counter.increment
    target:
      entity_id: counter.blind_moves_today

# Stale lux (>20 min without a report) hands the loop to a sun-position model.
# A manual wall-switch press suppresses the loop for 45 minutes via
# binary_sensor.blind_manual_override, which matters more than any tuning value.