I have been wondering how to do this for a while but I can not seem to find a good solution. I could use a good solution in multiple projects.
I have 2 objects, both objects are costumizable in the way that I prefer. I want to sense if the 2 objects are touching (rapid touching). I have been thinking about IR, magnetic fields etc but I need to be sure that they are actually touching (close proximity is not enough). Providing both objects with a metal piece that connects seems to make sense but as my as my knowledge reaches I always need a 2 channel connection to send signal between object 1 and 2. I can not have a two channel connection, only one is possible. Is there a way I can let object 1 know when object 2 is touching using only one contact point? I have been thinking in the direction of small sparks causing a small ??voltage drop?? but don't get far there. Anyone any ideas?