I've got an idea for a little project and need some help on the electronics side of things, I've not done it since school so even something like this has stumped me!
I'm after small setups that, when within ~ 50cm of each other will light an LED…simple eh?!
I'm thinking they should be as small as possible & run off large watch batteries (if possible)
I guess I need some sort of range detecting thingy, I imagine the rest would be easy after that (optimism or what!?)
So can anyone offer advice or have any suggestions for where to buy the parts from? I'm obviously aiming for as cheap as possible!
Thanks guys!
Rob