Piezo sensor experimentation

Did you know that you could use the speaker in an old phone to detect if someone is knocking on your door? Here we will explain how Piezos work and give some examples of how they could be used. How does the Piezo work? Inside the Piezo, there are crystals. These crystals are normally in electroni...

By: dannevig



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from Instructables: exploring - technology http://ift.tt/1tJgect