When the alarm goes off, I want to write NO1 error in big letters Please tell me how to set it up

When the alarm goes off, I want to write NO1 error in big letters Please tell me how to set it up
flows (9).json (25.1 KB)

Do you mean like a pop up alert? There is a video here you could take a look at:

I watched the video well. That’s not the answer we want. What we want is to sound an alarm and display text when the temperature rises. Please refer to the data.
flows (10).json (27.8 KB)