Home‑Assistant Sunrise Alarm

Turn your smart lights into a natural alarm clock

This script turns any compatible light (or group of lights) into a soft‑sunrise / sunset alarm. It gradually ramps the brightness and the colour temperature over a user‑defined period

The script can also run in reverse mode, turning the light down to simulate a sunset.

This project is made up of two blueprints

• sunrise-simulation.yaml: Simulates a sunset/sunrise on a group of lights based on user-defined parameters
• sunrise-alarm.yaml: Thin wrapper that calls the simulation script when trigger occurs.

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1. What it is & how it works

Component	Purpose	What it does
sunrise‑simulation (script)	The “engine” that gradually lights up (or down) your bulbs	Uses a repeat loop to turn the selected lights on/off and slowly increase/decrease brightness over a configurable time span.
sunrise‑alarm (automation)	The “scheduler” that calls the simulation at a chosen time	Triggers the script at Alarm Time – Offset (e.g. 30 min before the clock). An input_boolean lets you switch the alarm on/off.

Why two separate blueprints?
The simulation can be reused in any scenario (e.g. a “morning routine” or a “sunset‑in‑30‑min” routine). The alarm automation is a thin wrapper that turns that simulation into a timed alarm.

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2. Installation

2.1 sunrise‑simulation

1. Import the blueprint

   

2. Create a script from the blueprint

   • In the “Create new script” dialog, name it sunrise-simulation (you can give any name you like).
   • You’ll be asked for a handful of variables – see section 3.1 for the defaults and meaning.
   • Click Create – Home‑Assistant will add a script entity called script.sunrise-simulation (or whatever name you gave it).

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2.2 sunrise‑alarm

1. Import the alarm automation blueprint

   

2. Create the automation

   • Pick an input_datetime that represents the clock you want to use as the alarm.
   • Pick an input_boolean that toggles the alarm on or off.
   • Choose an offest_duration for how long before/after to start the sunrise arc relative to the alarm time. You'll usually want this to be the same as duration defined in the previous script, this time negative, so that the peak (end) of the arc aligns with the alarm time.
   • Choose the sunrise‑simulation script you created in the previous step for the alarm_script field.
   • Save – you now have a ready‑to‑run alarm!

Tip

– If you want a sunset alarm, simply copy the sunrise‑simulation script (or create a new script from the blueprint if you want to define a different arc) and reverse it by setting direction with the reversed flag set to true. You'll also want to create a new automation that calls it with a negative offset_duration.

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2.3 Configurable variables

3.1 sunrise‑simulation script variables

Variable	Type	Default	Description
lights	list of entity_ids	["light.kitchen"]	All bulbs that should be part of the arc.
total_duration	integer	30	Total time the arc takes on minutes.
steps	integer	10	How many brightness steps the script performs. If your light(s) do not support transition you should set this higher for a more gradual change (max value is 100).
start_brightness	integer	0	Brightness percentage at the very beginning of the arc.
end_brightness	integer	100	Brightness percentage at the very end of the arc.
start_temp	integer	2000	Color temperature (kelvin) at the very beginning of the arc.
end_temp	integer	5000	Color temperature (kelvin) at the very end of the arc.
reversed	boolean	false	If true, the script will run your arc in reverse (useful for easily defining sunsets).
curve_type	string	sigmoid	linear, parabolic (quadratic), or sigmoid (an S-curve). As we don't perceive light intensity linearly, sigmoid or parabolic make for a more natural curve.

3.2 sunrise‑alarm automation variables

Variable	Type	Default	Description
alarm_time	input_datetime	—	The time you want the alarm to ring (e.g. 07:00 AM).
offset_duration	time	"00:30:00"	How many minutes after alarm_time the sunrise arc should start. A negative value would start before the alarm.
alarm_enabled	input_boolean	—	A switch that turns the whole alarm on/off.
sunrise_script	script	—	The script instance created by the sunrise‑simulation blueprint (script.sunrise-simulation).

The automation uses the following logic:

1. Alarm Time – Offset fires the automation.
2. If Alarm Enabled is on, it calls the sunrise script.
3. If Alarm Enabled is off, nothing happens.

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6. License

This repository is released under the MIT License.
Feel free to fork, modify, or redistribute the blueprints as long as you keep the same license.