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How do I apply Screen Save to PIR Sensor

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Hi, I am a Grade 12 STEM Student, and right now I need someone's help on our Investigatory Project.

Can someone help me on how to connect screen saver (turns off automatically when snoozing) and turns on when PIR Sensor detected something so that It saves power when not used. And I also need to know how do I connect it to the Smart TV because our project is basically an Interactive Board (The thing that you can find around malls which you can use to know specific locations around the mall.)
What I have:
1. Orange Pi
2. PIR Sensor
3. Smart TV

What I need:
1. A step-by-step procedure on how to do it.
2. What commands/codes to input (Right now, we are using Python language but you can suggest other languages that we can use.)

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