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Examples on effect, palette randomization for wled (#15981)

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Co-authored-by: Franck Nijhof <git@frenck.dev>
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Teemu R 2020-12-21 21:08:49 +01:00 committed by GitHub
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@ -122,3 +122,47 @@ This service allows for loading a preset saved on the WLED device.
| `preset` | no | ID of the preset slot to load from. |
More information on presets [is documented in the WLED Wiki](https://github.com/Aircoookie/WLED/wiki/Presets)
## Example Automations
### Activating Random Effect
You can automate changing the effect using a service call like this:
{% raw %}
```yaml
service: wled.effect
data:
entity_id: light.wled
effect: "{{ state_attr('light.wled', 'effect_list') | random }}"
```
{% endraw %}
### Activating Random Palette
Activating a random palette is a bit more complicated as there is currently no way to obtain a list of available palettes.
To go around this issue, one solution is to leverage the fact that palettes can be activated by their IDs.
As the IDs are based on an incrementing counter, picking a random number between zero and the number of palettes minus one works.
To do this, the first step is to use [WLED's JSON API](https://github.com/Aircoookie/WLED/wiki/JSON-API) find out how many palettes the device supports:
```bash
$ curl --silent http://<ip address of the wled device>/json | jq ".palettes | length"
54
```
In this case (using WLED v0.11.0) there are 54 palettes, so the following service call will activate a random palette by its ID between 0 and 53:
{% raw %}
```yaml
service: wled.effect
data:
entity_id: light.wled
palette: "{{ range(0,53) | random }}"
```
{% endraw %}