This box is simply made to show and tell people if you are busy or not, showing the red light you are busy so no time for questions or whatever, green light you are free, go for it thats the moment!It will be really helpfull in an office or in a studio. Build the box The first step is build the b...By: apo1389
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from Instructables: exploring - technology http://www.instructables.com/id/Busy-Free-Indicator-Led-Box/
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