Use pir sensors to start a video

Other Hardware Sensors
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Hi, so my idea for an art piece simply is this: A screen mounted on the floor where you see a persons feet standing close to the camera. And when you as a spectator move towards the video piece the person in the video moves backwards. And the person in the video moves closer to the camera again as the spectator moves away.

Is this possible to do this with arduino and pir sensors? Ive never worked with this technik so I´m really a newbie. I understand that I can use Max msp to play the video files right? Has anyone tried doing something like this?

I haven't bought the technic yet, so please tell me what i need to buy for this project.

Thank you in advice

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I assume it is a person in front of this that is moving for and aft. It would take a lot of work to accomplish with a PIR. There are ultrasonic sensors that should do a good job and are very inexpensive. Tons of stuff on the web about them and even software for the arduino.

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