/diy/ - Do It Yourself

>>2423335
just build a FTIR (frustrated total internal reflection) table. it also acts as a touch screen. the software is open source, you just need to mount a webcam next to the projector to pick up touch inputs. a thick sheet of acrylic with an opaque back projection screen like a sheet of vinyl treated with a compliance layer made of silicon applied to it. IR leds lining the edge of the acrylic glass shine ir light into it, when someone touches the screen, ir light bouncing around inside the glass gets reflected by your finger touching the glass out of it, so it gets picked up by the webcam as trackable blobs of light. you could build this into a box, the projector would be hidden away inside the box since its a back projection system, and hands would not cast shadows onto the table as they interact with it. it has a low center of gravity and wont topple over or wobble around. you can additionally use 2 mirrors to bounce the image twice to increase focusing distance, to allow even larger projection surfaces. ive seen ones half the size of a ping pong table

these dj setups work the same way , but its also easy to DIY into a enclosed box https://www.youtube.com/watch?v=OVMmmwginGw

https://www.youtube.com/watch?v=Cxi3dzYvOn4

https://www.youtube.com/watch?v=mB9_Tut-WG8