# Home-Assistant Sunrise Alarm
_Turn your smart lights into a natural alarm clock_
This project is made up of two blueprints
- `sunrise-simulation.yaml`: 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.
- `sunrise-alarm.yaml`: Thin wrapper that calls the simulation script when the alarm occurs (or some configured time before/after).
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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. The brightness and color curves can be configured to create more natural-looking sunrises. |
| **sunrise-alarm** (automation) | The “scheduler” that calls the simulation at a chosen time | Triggers the script at *Alarm Time - Offset* (e.g. 30min before the clock). An `input_boolean` lets you switch the alarm on/off. |
> [!NOTE]
> **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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## Installation
### sunrise-simulation
1. **Import the sunrise script 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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### 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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## Configurable variables
### sunrise-simulation script variables
| Variable | Type | Default | Description |
|----------|------|---------|-------------|
| `lights` | list of `entity_id`s | `["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.
### 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.
> [!WARNING]
> You may not be able to set negative duration values via the user interface. If so, you'll need to edit the YAML directly.
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## 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.
