what thing could make an item open by just coming near to it? Answered
I'm trying to make a necklace that lights up when i come near to it...
My plan is to attach a LED to a small glass ball and give it to my wife so that when i'm near it lights up.
I thought of a remote that uses Bluetooth although i don't think a receiver can fit to a simple necklace, and i actually don't have any idea how to make a remote.