I'm working on a project that utilizes an array of IR sensors and recievers to map objects directly in front of it. This is similar to the various interactive coffee table setups that light an LED when something is close to it (via reflection of the IR light).
Now, I'm creating this array and putting it directly underneath a sheet of acrylic (or some other opaque material), so that when something is directly on top of the sheet it will pick it up. This makes the design easier, because my working range for the sensors is small and short (like 1 cm).
With that being said, I'm trying to figure out which IR emitters and sensors to use that will efficiently achieve this. I've been looking at SMDs because size is a factor, and I was hoping to use this emitter and this sensor, but I have some concerns.
This emitter is small and considerably weaker than those used in other emitters used in sensors (like the TCRT5000), and I don't even know how to compare the phototransistors, but given the very small range and somewhat controlled conditions, I was hoping it would work well to not only save space but to limit the noise of everything not directly on top of the acrylic.
I just need to know if this setup could work so that I can order them and start testing them, but if I'm not even close I'd rather try something else. If anyone has any tips for choosing these emitters and sensors, that would be great.