I Had to build this for my sister who has hearing problem which lets her know when someone's knocking at the door downstairs. This device is easy to build and can be used anywhere in the house. It lights up with the slightest noise made either from knocking door or talking. Let's you know when someo...By: barzillialloyd
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from Instructables: exploring - technology - robots http://ift.tt/1x2IwD3
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