Custom Binary Sensor
====================

This integration can be used to create custom binary sensors in esphomelib
using the C++ (Arduino) API.

Please first read :doc:`/esphomeyaml/components/sensor/custom`, the same principles apply here and binary sensors are
very similar to sensors internally.

.. code-block:: cpp

    using namespace esphomelib;

    class MyCustomBinarySensor : public PollingComponent, public binary_sensor::BinarySensor {
     public:
      // constructor
      MyCustomBinarySensor() : PollingComponent(15000) {}

      void setup() override {
        // This will be called by App.setup()
      }
      void update() override {
        // This will be called every "update_interval" milliseconds.

        // Publish an OFF state
        publish_state(false);

        // Publish an ON state
        publish_state(false);
      }
    };

    void setup() {
      // ...

And in YAML:

.. code-block:: yaml

    # Example configuration entry
    binary_sensor:
    - platform: custom
      lambda: |-
        auto my_custom_sensor = new MyCustomBinarySensor();
        App.register_component(my_sensor);
        return {my_sensor};

      binary_sensors:
        name: "My Custom Binary Sensor"

Configuration variables:

- **lambda** (**Required**, :ref:`lambda <config-lambda>`): The lambda to run for instantiating the
  binary sensor(s).
- **binary_sensors** (**Required**, list): A list of binary sensors to initialize. The length here
  must equal the number of items in the ``return`` statement of the ``lambda``.

    - All options from :ref:`Binary Sensor <config-binary_sensor>` and :ref:`MQTT Component <config-mqtt-component>`.

See Also
--------

- `Edit this page on GitHub <https://github.com/OttoWinter/esphomedocs/blob/current/esphomeyaml/components/binary_sensor/custom.rst>`__

.. disqus::