Receiving Button State

It is trivial to instruct Home Assistant to forward the state of a given entity to your device. Before you look into the details, here are the prerequisites:

• Device Added To Home Assistant: your ESPHome device must have been added to Home Assistant, and your configuration must have requested api: access. This is typically automatically configured in your configuration when you add a new ESPHome device.
• Sensor Type: you must know the sensor type of the entity you want to read: binary_sensor: (like a switch), sensor: (numerical data like a temperature sensor), or text_sensor: (for text values). If the sensor you are interested in was defined by an ESPHome device, simply look up the sensor type in that configuration.

Button State

Most buttons are represented by a binary_sensor: and can have an on and off state. Let’s assume the entity id of the switch you are interested in is switch.powerstrip_400w_ssr_1_switch1. Then this binary_sensor named light1state would notify you whenever the button state changes:

binary_sensor:
  # HOMEASSISTANT SENSORS
  - platform: homeassistant
    name: "Light1"
    id: light1state
    entity_id: switch.powerstrip_400w_ssr_1_switch1
    on_state: 
      then:
        - if:
            condition:
              lambda: 'return id(light1state).state == true;'
            then:
              # Actions when the switch is turned on
              - logger.log: "The switch was turned ON!"
            else:
              # Actions when the switch is turned off
              - logger.log: "The switch was turned OFF!"

If your ESPHome device has been added to Home Assistant, you can interface your configuration with Home Assistant entities in a number of ways.

Your device must have been added to Home Assistant before you can access Home Assistant entities. Even if you are using ESPHome inside of Home Assistant, you still need to explicitly add your ESPHome device to Home Assistant. Typically, when you create a new ESPHome device, the first time you upload your firmware to it and run it, Home Assistant pops up an automatic notification about “newly discovered devices”. Click the notification and follow the instructions to add the device.

Overview

Here are a few use cases illustrating the potential of interfacing ESPHome configurations with Home Assistant:

• Publishing Information: your microcontroller may be battery-driven, and you’d like to publish the current battery state to Home Assistant so in the Home Assistant dashboard, you can immediately see when the battery runs low.
• Publishing Controls: you may want to use buttons on your device to control other devices managed by Home Assistant. For example, you may want to create a set of buttons that can switch on and off some lights in your house.
• Receiving Device State: you want Home Assistant to inform your device when a given entity state changes. For example, you want your device to show icons based on which lamps in your house are currently turned on or off.

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