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Use sound exicter to produce vibration with esp32

AndrewT

Hi everyone! I want to use a sound exciter as a haptic motor which produces the vibration. However, it always makes some noise.

How can I reduce the noise as much as possible? eg the editing program.

Thank you!

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  • What sort of waveform you are driving the exciter with?  What you perceive as 'noise' could simply be the sharp edges of a digitally-generated synthesized low frequency waveform. For instance, a 20Hz sine wave is a pure tone that would vibrate a surface or mass at only 20Hz, which you probably would not hear. But if you are using a square waveform there are harmonics at multiples of 20Hz which will sound like someone knocking on your front door 40 times a second (one knock when the drive goes positive, one knock when it goes negative).  Run your signal through a low-pass filter and see if that helps reduce the audible noise component. 

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  • What sort of waveform you are driving the exciter with?  What you perceive as 'noise' could simply be the sharp edges of a digitally-generated synthesized low frequency waveform. For instance, a 20Hz sine wave is a pure tone that would vibrate a surface or mass at only 20Hz, which you probably would not hear. But if you are using a square waveform there are harmonics at multiples of 20Hz which will sound like someone knocking on your front door 40 times a second (one knock when the drive goes positive, one knock when it goes negative).  Run your signal through a low-pass filter and see if that helps reduce the audible noise component. 

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