Use sound exicter to produce vibration with esp32

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!

Top Replies

BigG over 1 year ago +3

Sound exciters only make a noise because the wave form it produces resonates across a surface. Thus if you removed the sound exciter from any surface it won't make much noise. Similarly, if you placed…
shabaz over 1 year ago in reply to AndrewT +2

Impressed at the 279 euro price tag! It's overpriced by about 250 euro, considering it's just a small Bluetooth speaker with perhaps a few motors added too, and a bit of basic signal processing. Although…
michaelkellett over 1 year ago +1

The clue is in the name a sound exciter (AKA a loudspeaker) is designed to make a noise ! A vibration exciter is designed to make vibration. There are loads on Ebay and Amazon, not expensive. This…

anniel747 over 1 year ago in reply to michaelkellett

There is also the bass shakers that are somewhat in-between the sound and vibration exciters.
Cancel
Vote Up 0 Vote Down

Sign in to reply

Cancel
Jan Cumps over 1 year ago in reply to anniel747

balearicdynamics and I made one: Field Trip to Enrico and the Ingegno Maker Space
Cancel
Vote Up +1 Vote Down

Sign in to reply

Cancel
anniel747 over 1 year ago in reply to Jan Cumps

Did you try it out as a Chladni plate?
Cancel
Vote Up 0 Vote Down

Sign in to reply

Cancel
BigG over 1 year ago

Sound exciters only make a noise because the wave form it produces resonates across a surface. Thus if you removed the sound exciter from any surface it won't make much noise.

Similarly, if you placed a haptic motor on a cardboard box then it too will make noise as the high frequency vibrations resonate across the cardboard surface.

So if you set a constant frequency and control the amplitude of the sound wave through the sound exciter then it will mimic a vibration effect at that set frequency.
Cancel
Vote Up +3 Vote Down

Sign in to reply

Cancel
Electrojim over 1 year ago

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.
Cancel
Vote Up +1 Vote Down

Sign in to reply

Cancel
davebullockmbe over 1 year ago

Theres always an alternative approach www.bristol.ac.uk/.../
Cancel
Vote Up 0 Vote Down

Sign in to reply

Cancel
Jan Cumps over 1 year ago in reply to anniel747

no
Cancel
Vote Up 0 Vote Down

Sign in to reply

Cancel
anniel747 over 1 year ago in reply to davebullockmbe

Some military applications use that also.
Cancel
Vote Up 0 Vote Down

Sign in to reply

Cancel
AndrewT over 1 year ago in reply to anniel747

https://www.daytonaudio.com/product/1296/daex-13-4sm-haptic-feedback-and-audio-exciter-13mm-3w-4-ohm

I find that it can be a sound exciter and Haptic Feedback.

But I want to make it as a haptic feedback.Therefore, I hope that can minimize the noise and have strong vibration

.
Cancel
Vote Up 0 Vote Down

Sign in to reply

Cancel
AndrewT over 1 year ago

https://feelbelt.de/en/

This is one of the products that I saw on the internet. It can generate haptic feedback without sound.

Any ideas?
Cancel
Vote Up 0 Vote Down

Sign in to reply

Cancel