Create automation

Hello, I ask for your help.
I would like to create a sensor that automatically changes its status from on to off and from off to on every 30 seconds.
can you give me information as precise as possible …
Thank you

I’d suggest https://www.home-assistant.io/integrations/template#trigger-based-template-sensors to create a binary sensor that you turn on every minute, that turns itself off after 30 seconds. Probably something like:

template:
  - trigger:
      - platform: time_pattern
        # This will update every minute
        minutes: "*"
    binary_sensor:
      - name: Flippy boi
        state: 'on'
        auto_off: '00:00:30'

Really thank you …
if I wanted to change the dashboard when the event occurs, how should I do?
Thanks

What do you mean by that?

I would like to use the same principle to navigate to a different screen with a timing

thk

You want to change the UI? There’s not, that I know of, any built in way of doing that. You’d need something like this custom component to do that.

Sorry, I don’t speak English very well.
I don’t want to change UI, I want to change page in the same UI, in other situations I use NAVIGATE. Thank you

Yes, that custom component is what you need for that.