we usually use to see when a car horns in front of a deaf person he dosn't react but with my device when the car horns then the condensor microphone catches the sound waves and then covert these sound waves into electrical waves and there is a vibrating moter which vibrates when car horns. mat...By: MohakM
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from Instructables: exploring - technology - robots http://ift.tt/1Kj6EaF
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