31 Aug '14, 5am

Proximity Sensing LEDs Can Add a New Dynamic To Your Projects

Looking for a fun and easy way to add a bit more interaction to your LED-laden projects? Why not turn them into proximity sensing LEDs? Our hacker, [Will], is just getting into designing his own PCBs. He was looking for a simple project to try out that wouldn’t be too hard to design and manufacture a PCB for, so he came up with this clever little interactive LED array. It’s actually a very simple circuit which also makes it super easy to build on a prototyping breadboard. Each proximity sensing LED is made up of five components. Three resistors, an LED, an IR LED, and a photo transistor. The IR LED is chosen specifically for the type of photo transistor being used — in this case, it emits a wavelength of 880nm, which is the type of light the photo transistor recognizes. These components are wired in a manner that the IR LEDs are always on. The normal LED is wired in series...

Full article: http://hackaday.com/2014/08/30/proximity-sensing-leds-can...

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