Hey all,
I am going to start working on a project and one thing I want to do is have some type of sensor that senses if an object is on a table. The object could be anything. The sensor has to go through frosted glass. IR would work but the problem is I need this to happen on 60+ spots of the table. and that would be over $100 just for the IR part. So is there a cheap way of doing Ir or another type of sensor that is cheaper that would work?
Thanks,
-Korki
Say, you have 60 spots. Do you need to know which spot the object is covering or do you need to know the object is covering A spot? Is the side of the glass accessible to your project? You might be better off with a webcam and IR lights. Google multi-touch screen + webcam. There's a lot of such projects. They need say a PC and a webcam.
I would need to know which spot they touch and I wont be able to have a computer with it. I did some more looking and saw on the playground theres one using the Panasonic pna4602m.
http://www.arduino.cc/playground/Main/PanasonicIrSensor
I found a different one that is from hebeiltd. Here is the data sheet for it:
I should be able to use that instead right?
Thanks,
-Korki
No those two devices are entirely unstable for what you are doing. You want a simple reflective opto switch something like this:-
It is possible to get them much cheaper that this if you look around, less than $1.00 from some places.
But just get one to try before you go ordering lots.