This script increases or decreases the brightness of a light over time.
if your light supports transitions, you may not need this, use: light.turn_on with transition and brightness_step
This script increases or decreases the brightness of a light over time.
Given the transition time, initial brightness, target brightness and brightness step, the script will calculate the number of steps required to reach the target brightness and the delay between each step.
The script will then turn on the light with the initial brightness, then start increasing or decreasing the brightness by the brightness step every delay between steps until the target brightness is reached.
blueprint:
name: Increase or decrease light brightness over time
description: |
# Increase or decrease light brightness over time
This script increases or decreases the brightness of a light over time.
Given the **transition time**, **initial brightness**, **target brightness** and **brightness step**, the script will calculate the number of steps required to reach the target brightness and the delay between each step.
The script will then turn on the light with the initial brightness, then start increasing or decreasing the brightness by the brightness step every delay between steps until the target brightness is reached.
```text
Example: (increase)
100% ┌────────────────────────────────────────────────────────────────────────────────────────────┐
│ │
│ │
│ ┌ ◄─ target brightness
│ │ │
│ │ │
│ ┌────────────────┘ │
│ │ │
│ │ │
│ ┌─────────────────┘ │
│ calculated delay │ │
│ │ │ │
│ │ ┌─────────────────┘ │
│ │ │ │
│ ▼ │ │
│ ┌─────────────────┘ │
│ │ ◄──────────── brightness step │
│ │ │
initial brightness ──►┌─────────────────┘ │
│ │ │
│ │ │
0% └─┴◄───────────────────────────────────────────────────────────────────────────────────────►─┘
0s transition time
```
### Notes / Calculations
- _avoid short and low brightness steps to reduces turn_on light service calls_
- _steps = (target brightness - initial brightness) / brightness step_
- _delay = transition_time / steps_
domain: script
author: op00
source_url: https://community.home-assistant.io/t/increase-light-brightness-over-time/600349
input:
light_entity:
name: Light Entity
description: "Select your light"
selector:
entity:
filter:
domain: light
multiple: false
transition_time:
name: Transition Time
description: "From 1 minute up to 1 hour"
default: 120
selector:
number:
min: 60
max: 3600
step: 1
unit_of_measurement: seconds
mode: slider
target_brightness:
name: Target Brightness
description: "if you want to dimm the lights, this needs to be lower than initial brightness"
default: 100
selector:
number:
min: 0
max: 100
step: 1
unit_of_measurement: '%'
mode: slider
initial_brightness:
name: Initial Brightness
description: "if you want to dimm the lights, this needs to be higher than target brightness"
default: 0
selector:
number:
min: 0
max: 100
step: 1
unit_of_measurement: '%'
mode: slider
brightness_step:
name: Brightness Step
description: "default is 2%, if target brightness is lower than initial brightness, it's negative"
default: 2
selector:
number:
min: 1
max: 100
step: 1
unit_of_measurement: '%'
mode: slider
mode: single
icon: mdi:lightbulb-on-60
variables:
transition_time: !input transition_time
brightness_step: !input brightness_step
initial_brightness_pct: !input initial_brightness
target_brightness_pct: !input target_brightness
light_entity: !input light_entity
sequence:
- variables:
target_brightness: '{{(target_brightness_pct * 255 / 100)|round}}'
initial_brightness: '{{(initial_brightness_pct * 255 / 100)|round}}'
required_steps: '{{(((target_brightness_pct - initial_brightness_pct) / brightness_step))|round|int|abs}}'
delay_between_steps: '{{ (transition_time / required_steps)|round|int|abs }}'
brightness_step: '{% if (initial_brightness > target_brightness) -%}
{{ brightness_step * (-1) }}
{%- else -%}
{{ brightness_step }}
{%- endif %}'
- service: light.turn_on
data:
brightness: '{{ initial_brightness }}'
transition: 0
entity_id: !input light_entity
- repeat:
until:
- condition: template
value_template: '{% if (brightness_step > 0) -%}
{{ state_attr(light_entity, "brightness") | int(0) >= target_brightness }}
{%- else -%}
{{ state_attr(light_entity, "brightness") | int(0) <= target_brightness }}
{%- endif %}'
sequence:
- service: light.turn_on
data:
transition: 0
brightness_step_pct: '{{ brightness_step }}'
entity_id: !input light_entity
- delay:
hours: 0
minutes: 0
seconds: '{{ delay_between_steps }}'
milliseconds: 0
Usage
- Import Blueprint
- Create and save script based on the imported blueprint
- Run or use the script in your automations
Changelog
- 2023-08-12: added dimming option
- 2023-08-12: removed initial delay
- 2023-08-12: fixed 0% initial brightness bug
- 2023-08-12: a few text changes
- 2023-08-07: added user customizable initial delay
- 2023-08-07: Initial release
ToDo
Spellcheck- Multi entity handling
🧑🏼🤝🧑🏻 Contributions
- @pepe59
- @aaroneisele55
- Very welcomed and please do
added