Hi Stevie. Basically, as long as it is in contact it will work.
The piezo just needs to be able to "feel" the vibration. One could amplify a chocolate bar with a piezo and hear what it sounds like to unwrap it and take a bite. I'm pretty sure the gain level would be low ( I doubt that chocolate has much resonance), but my point is that the transducer isn't picky. If it can "feel" a vibration, it will convert it to an electrical signal.
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Hi Stevie. Basically, as long as it is in contact it will work.
The piezo just needs to be able to "feel" the vibration. One could amplify a chocolate bar with a piezo and hear what it sounds like to unwrap it and take a bite. I'm pretty sure the gain level would be low ( I doubt that chocolate has much resonance), but my point is that the transducer isn't picky. If it can "feel" a vibration, it will convert it to an electrical signal.