I'm trying to design a small gadget for a class project, and I was hoping to get some help with the necessary components.
Part I: I want something like 2 plates when they are in close proximity that can emit some sort of signal. (I was thinking maybe there is a cheap commercial form of something similar to RF id cards?)
Part II: I want another two plates which can pick up the signal from Part I if it is emitting and when these two plates themselves are separated and the other two plates are close a sound is produced.
Thanks!!!
Matt
Part I: I want something like 2 plates when they are in close proximity that can emit some sort of signal. (I was thinking maybe there is a cheap commercial form of something similar to RF id cards?)
Part II: I want another two plates which can pick up the signal from Part I if it is emitting and when these two plates themselves are separated and the other two plates are close a sound is produced.
Thanks!!!
Matt