Turn off tablet with arduino

Hi,

I have a science project.
I need to connect the arduino ( with ultrasonic sensor ) to a screen and when someone is close to the screen the arduino turns off the screen.

I wanted to use a tv…but found difficulty in getting a tv screen for the project.

Alternatively, I bought a cheap tablet and would like to use it instead.

Any help with connections,
programs or programming? ?

I wanted to use a tv....but found difficulty in getting a tv screen for the project.

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