esphome-docs/components/light/custom.rst

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Custom Light Output
===================
This integration can be used to create custom lights in ESPHome
using the C++ (Arduino) API.
Please first read :doc:`/components/sensor/custom` guide,
the same principles apply here.
All internal stuff (like effects, transitions etc) is handled by the light core
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and cannot be overridden. Light outputs are only responsible for displaying some state
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when asked to do so.
The example below is an example of a custom light output.
.. code-block:: cpp
#include "esphome.h"
class MyCustomLightOutput : public Component, public LightOutput {
public:
void setup() override {
// This will be called by App.setup()
pinMode(5, INPUT);
}
LightTraits get_traits() override {
// return the traits this light supports
auto traits = LightTraits();
traits.set_supports_brightness(true);
traits.set_supports_rgb(true);
traits.set_supports_rgb_white_value(false);
traits.set_supports_color_temperature(false);
return traits;
}
void write_state(LightState *state) override {
// This will be called by the light to get a new state to be written.
float red, green, blue;
// use any of the provided current_values methods
state->current_values_as_rgb(&red, &green, &blue);
// Write red, green and blue to HW
// ...
}
};
(Store this file in your configuration directory, for example ``my_light.h``)
And in YAML:
.. code-block:: yaml
# Example configuration entry
esphome:
includes:
- my_cover.h
light:
- platform: custom
lambda: |-
auto light_out = new MyCustomLightOutput();
App.register_component(light_out);
return {light_out};
lights:
- name: "My Custom Light"
Configuration variables:
- **lambda** (**Required**, :ref:`lambda <config-lambda>`): The lambda to run for instantiating the
light output(s).
- **lights** (**Required**, list): A list of lights to initialize. The length here
must equal the number of items in the ``return`` statement of the ``lambda``.
- All options from :ref:`Light <config-light>`.
See :apiclass:`Light <light::LightOutput>`
See Also
--------
- :ghedit:`Edit`