Using Arduino for sensor triggered projection


I was looking into using an Arduino for an IR sensor triggered projection. I've never used one before and need some guidance about how to set it up?I'd be happy with some recommended youtube tutorials, or tips. Just a point in the right direction really.

Thought I could link an IR sensor to the Arduino to pick up movement, then link that to a laptop and tell it to press a key to activate a playlist of film clips that would be sent to the projector. Is this possible? If so, any pointers to how and where I would learn the code for programming? But also how I might connect the IR sensor to Arduino - then to the laptop, would I need wires?

Thanks for any help

Stuff about IR sensors here:

I suggest you Google: "ir sensor arduino" ... there are lots of hits.