projector idea

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i have a huge outdoor projector, an iphone, a 7in touchscreen, and a laptop. my idea i got from a youtube video, (they approached it way differently)

basically i want to hook the laptop up to the touchscreen as an input device, and the laptop to the projector. i want to be able to have like a blank screen, and if i draw on the pad it displays it out the projector.

ie, have the projector on the face of a building, if i draw a 9 or A or something on the touchscreen, it projects that letter onto the building. kind of like graffiti that goes away when you turn the projector off. heres there website to show you what i mean (cant get on youtube im at school)
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