Secret Knock Detecting Lock

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Une invention réalisée avec 2 tubes de PVC et un détecteur baptisé Piezo qui reconnaît les sons et les numérise.L’inventeur s’appelle Steve Hoefer qui se présente d’une phrase:  Je fabrique des choses et je résous des problèmesLe schéma de fabrication c’est ici
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Secret Knock Detecting Lock
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Knock Lock - Unlock a Door ... from feedproxy.google.com
 Piezoelectric elements can be used to make sound or detect sound. Steve Hoefer has made a Knock Lock, which is a device that can listen to knocks on the door. If the sequence of knocks is the same as the recorded knock sequence it unlocks the deadbolt on the door. Steve was the guy who [...]

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  Piezoelectric elements can be used to make sound or detect sound. Steve Hoefer has made a Knock Lock, which is a device that can listen to knocks on the door. If the sequence of knocks is the same as the recorded knock sequence it unlocks the deadbolt on the door. Steve was the guy who [...]
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