Nextion Switch Component

The nextion switch platform supports the many switched components in the Nextion as well as integer variables. It can be a component or variable in the Nextion display. It is best to set the components vscope to global in the Nextion Editor. This way the component will be available if the page is shown or not.

See Nextion TFT LCD Display for setting up the display

# Example configuration entry
display:
  - platform: nextion
    id: nextion1
    # ...

switch:
  - platform: nextion
    id: r0_switch
    name: "Radio 0 Switch"
    component_name: r0 # pageX.r0 for a global
    update_interval: 4s
  - platform: nextion
    id: darkmode
    name: "Is Darkmode Set"
    variable_name: darkmode

Configuration variables:

  • nextion_id (Optional, ID): The ID of the Nextion display.

  • component_name (Optional, string): The name of the Nextion component.

  • variable_name (Optional, string): The name of the Nextion variable. Any value over 0 is considered to be on

  • update_interval (Optional, Time): The duration to update the sensor. If using a Nextion Custom Switch Protocol this should not be used

  • background_color (Optional, Color): The background color

  • background_pressed_color (Optional, Color): The background color when pressed

  • foreground_color (Optional, Color): The foreground color

  • foreground_pressed_color (Optional, Color): The foreground color when pressed

  • visible (Optional, boolean): Visible or not

  • All other options from Switch.

Only one component_name or variable_name can be set

See How things Update for additional information

Globals

The Nextion does not retain data on Nextion page changes. Additionally, if a page is changed and the component_name does not exist on that page then nothing will be updated. To get around this, the Nextion components can be changed to have a vscope of global. If this is set then the component_name should be prefixed with the page name (page0/page1 or whatever you have changed it to).

Example

component_name: page0.r0

switch.nextion.publish Action

You can also publish a state to a Nextion switch from elsewhere in your YAML file with the switch.nextion.publish action.

# Example configuration entry
sensor:
  - platform: nextion
    id: nextion_switch
    ...
# in some trigger
on_...:
  - switch.nextion.publish:
      id: nextion_switch
      state: true
      # These are optional. Defaults to true.
      publish_state: true
      send_to_nextion: true
  # Templated
  - switch.nextion.publish:
      id: nextion_switch
      state: !lambda 'return true;'
      # These are optional. Defaults to true.
      publish_state: true
      send_to_nextion: true

Configuration options:

  • id (Required, ID): The ID of the Nextion switch.

  • state (Required, string, templatable): The boolean state to publish.

  • publish_state (Optional, bool, templatable): Publish new state to Home Assistant. Default is true.

  • send_to_nextion (Optional, bool, templatable): Publish new state to Nextion display which will update component. Default is true.

Note

This action can also be written in lambdas. See Lambda Calls

Lambda Calls

From lambdas, you can call several methods to access some more advanced functions (see the full API Reference for more info).

  • set_state(bool value, bool publish, bool send_to_nextion): Set the state to value. Publish the new state to HASS. Send_to_Nextion is to publish the state to the Nextion.

  • update(): Poll from the Nextion

  • set_background_color(Color color): Sets the background color to Color

  • set_background_pressed_color(Color color): Sets the background color to Color

  • set_foreground_color(Color color): Sets the background color to Color

  • set_foreground_pressed_color(Color color): Sets the background color to Color

  • set_visible(bool visible) : Sets visible or not. If set to false, no updates will be sent to the component

How things Update

A Nextion component with an integer value (.val) or Nextion variable will be automatically polled if update_interval is set. To have the Nextion send the data you can use the Nextion Custom Switch Protocol for this. Add the Nextion Custom Switch Protocol to the component or function you want to trigger the send. Typically this is in Touch Press Event but some components, like a slider, should have it set in the Touch Release Event to capture all the changes. Since this is a custom protocol it can be sent from anywhere (timers/functions/components) in the Nextion.

Note

There is no need to check the Send Component ID for the Touch Press Event or Touch Release Event since this will be sending the real value to esphome.

Using the above yaml example:

  • “Radio 0 switch” will poll the Nextion for the r0.val value and set the state accordingly.

  • “Is Darkmode Set” will NOT poll the Nextion. Either the Nextion will need to use the Nextion Custom Switch Protocol or use a lambda:

Note

No updates will be sent to the Nextion if it is sleeping. Once it wakes, the components will be updated. If a component is invisible, visible(false), then it won’t update until it is set to be visible.

Nextion Custom Switch Protocol

All lines are required

printh 90
prints "r0",0
printh 00
prints r0.val,0
printh FF FF FF

Explanation

  • printh 90 Tells the library this is a switch bool/integer data

  • prints "r0",0 Sends the name that matches component_name or variable_name

  • printh 00 Sends a NULL

  • prints r0.val,0 The actual value to send. For a variable use the Nextion variable name r0 with out .val

  • printh FF FF FF Nextion command ack

See Also