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LEDs that get brighter when they're closer. Answered

Ohkay, so I have an idea for a cute gift. The idea is to make two heart pendants that get brighter depending on how close they are to each-other. The problem is, I have no idea how to go about the dimming aspect. I've never even held a soldering gun, let alone used one. But I'd be willing to pick it up for this if I had a good tutorial/instructable to go off of.

Even a general idea of what to look into would be great. I've seen similar things like the WiFi detector t-shirt at ThinkGeek, but again I'm a n00b when it comes to this stuff, so I don't know how useful that is when applied to something like this.

Any help would be much appreciated, this is most definitely a burning question that's been bothering me.

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