Hello everyone.

I am working on a very interesting project that requires some haptic feedback in a glass screen. I have been working with an LRA (linear resonant actuator) from Precision Microdrives (8mm Linear Resonant Actuator - 3mm Type - Precision Microdrives) and the Adafruit breakout board to control it (Overview | Adafruit DRV2605L Haptic Controller Breakout | Adafruit Learning System).

However, as I was not very familiar with these and the magnitudes involved, I realized that the feedback (a.c.a. vibration) is almost impossible to perceive through the glass surface.

I was wondering if anybody in this community would have any idea on what elements would create a "feelable" click in your finger when touching it.

The effect I am looking for is somewhat like the feedback of a smartphone. I know that these have small haptic engines and still can feel it very well, but through my glass I need something more powerful.

Any ideas will be greatly welcome!

Thank you.

Perhaps it would be a good idea to describe your glass screen? (Numbers, not adjectives)

Thank you Mark, yes I should have been more technical...

Thickness: 1,8mm
Wide: 160mm
Long: 190mm

It is regular glass, not Gorilla or anything like that.

Hope this helps...

That comes to about 140 grams, so whatever is going to work with that has to be able to accelerate 140 grams
hard enough to be felt. What that level is defeated my Google search alas, but that LRA is miniscule and I suspect something considerable bigger, with much more mass, is going to be needed, perhaps an audio
exciter like this: https://uk.rs-online.com/web/p/speaker-drivers/8765266

Thank you for your reply Mark. Yes, the thing is minuscule (8mm) so the mass must be a couple of grams...

I understand your proposal, although I don't know how I can move that enormous coil. Should I use some external power source with a relay?

Also a doubt pops up in my mind: will it generate a tone? I am looking for a "click" sound at much and a very short haptic response, I have seen that the minimum frequency of this thing is 300Hz...

Sorry, I am a very intrepid beginner... :slight_smile:

Thanks again for your support.

Well I am equally a beginner in haptic feedback really, although I have programmed the rumble motors in
a PS2 controller from an Arduino project…