We all love summer vacation but there comes a time when you get bored of your Xbox and decide to start off a new project to keep you busy.
Well this is what happened to me and I decided to build an Arduino controlled interactive LED table surface after watching a couple of demos on Youtube. The sensor I was going to use for interaction was RPR359F Photosensor since I had already used it earlier in a project. However, at that time, I managed to get as many of these as I wanted from the university as it was a part of a course. But I was astonished when I tried to buy it myself. The damned thing costs a lot.
Since I need nearly a hundred of them so now I am looking for a cost effective alternative to those photosensors to use it in my project. I was wondering if the LDRs are what I am looking for but wouldn't the light feedback effect keep them always on. And I am not even sure if they would be able to detect the user's hand as efficiently as those photosensors could do.
Please suggest any other cheap solution and also comment on the LDR's usage.