What is your opinion about this solutions
Would an IR transmitter/receiver be adequate? eg.http://learn.parallax.com/node/299
QuoteWhat is your opinion about this solutionsSorry I don't think any will work.This is a much more difficult task than you think. RF will not work like you think it will.The only thing could be an IR or ultrasonic distance sensor but that will only detect the closest object.
IR doesn't go through walls and boxes (objects will be hidden) so no.
Well bluetooth and active RFID already work...
This would be a job for...http://dcdwireless.com/... if that circuit ever gets INTO PRODUCTION!!!You could consider doing your own version of the same idea.
I can't see how this would measure distance. Reading RF signal strength as a measure of distance is something that does not work well in practice due to propagation interference from the surroundings.