![]() In those devices, it's basically a black and white camera which reads only one line of pixels. With enough LED and sensors you can get a much more precise solution.īut for this project, I was looking for something more suited for the reading. When one receptor can't see any light, it means that an object is blocking the light. You turn on every LED one by one and read the sensors. Basically, it's like having a huge number of IR receptors with some IR LED. This solution implies the use of light triangulation to read a very precise coordinate. Plus, I am sure there are a lot of possibilities I haven't thought about to improve this. But depending on the way you make it you can have some interesting results. Of course, nothing is perfect and with this solution it's not possible to build a 100% multi-touch screen and it's hard to cover the entire screen area. This method is quite cheap ( the priciest part is the TV), with a good quality image and you can make the table almost as small and as thin as your TV is. It uses light triangulation technology to read the coordinates. I made this tutorial to help people to build their own touch screen solution based on any flat screen TV. Not the best solution for a coffee table. ![]() The result gives you a complete multi touch screen solution, but you need some depth for the videoprojector to have a big screen. Often They imply using a videoprojector, reflection mirror and IR camera. I have been reading about DIY touch screen table projects for a while now, and I find most of them very complicated. Hi and welcome to my third Instructable ! UPDATE : CCD sensor reverse Engineering + Using 2 CCD sensors + Laser engraving vector files + Retropie playing UPDATE : Multipoint software + Emulating NES video/pictures + OPTION_7 Point and Click + speed test + OPTION video It explain everything you need to know to understand how to build your touch screen!!
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