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109 lines
3.1 KiB
ReStructuredText
109 lines
3.1 KiB
ReStructuredText
Generic Custom Component
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========================
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This integration can be used to create generic custom components in ESPHome
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using the C++ (Arduino) API. This integration should be used in cases where
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none of ESPHome's abstraction layers (for example the "sensor", "binary sensor",
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"switch", etc concepts) work well for your integration.
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Please first read :doc:`/components/sensor/custom` guide, the same principles apply here.
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The example below is an example of a custom component that can do anything you want really.
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.. code-block:: cpp
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#include "esphome.h"
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using namespace esphome;
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class MyCustomComponent : public Component {
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public:
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void setup() override {
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// This will be called once to set up the component
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// think of it as the setup() call in Arduino
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pinMode(5, INPUT);
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pinMode(6, OUTPUT);
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}
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void loop() override {
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// This will be called very often after setup time.
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// think of it as the loop() call in Arduino
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if (digitalRead(5)) {
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digitalWrite(6, HIGH);
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// You can also log messages
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ESP_LOGD("custom", "The GPIO pin 5 is HIGH!");
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}
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}
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};
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In many cases however components should communicate with other appliances using the network.
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That's why there is :cpp:class:`mqtt::CustomMQTTDevice`. It is a helper class to create
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custom components that communicate using MQTT.
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.. code-block:: cpp
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#include "esphome.h"
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using namespace esphome;
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class MyCustomComponent : public Component, public mqtt::CustomMQTTDevice {
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public:
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void setup() override {
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// This will be called once to set up the component
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// think of it as the setup() call in Arduino
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pinMode(6, OUTPUT);
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subscribe("the/topic", &MyCustomComponent::on_message);
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// also supports JSON messages
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subscribe_json("the/json/topic", &MyCustomComponent::on_json_message);
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}
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void on_message(const std::string &payload) {
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if (payload == "ON") {
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digitalWrite(6, HIGH);
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publish("the/other/topic", "Hello World!");
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} else {
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digitalWrite(6, LOW);
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publish("the/other/topic", 42);
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}
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}
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void on_json_message(JsonObject &root) {
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if (!root.containsKey("key"))
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return;
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int value = root["key"];
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// do something with Json Object
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// publish JSON using lambda syntax
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publish_json("the/other/json/topic", [=](JsonObject &root2) {
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root2["key"] = "Hello World";
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});
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}
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};
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(Store this file in your configuration directory, for example ``my_custom_component.h``)
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And in YAML:
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.. code-block:: yaml
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# Example configuration entry
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esphome:
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includes:
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- my_custom_component.h
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custom_component:
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- lambda: |-
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auto my_custom = new MyCustomComponent();
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return {my_custom};
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Configuration variables:
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- **lambda** (**Required**, :ref:`lambda <config-lambda>`): The lambda to run for instantiating the
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binary sensor(s).
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See :cpp:class:`Component` and :cpp:class:`mqtt::CustomMQTTDevice`.
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See Also
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--------
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- :ghedit:`Edit`
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