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Recommendation for Piezo actuator (similar to "Touch on Metal Buttons" EVM)

Maximilian Gauger1
Prodigy 110 points

After seeing TI´s demonstrator www.ti.com/.../tida-00314 in action, I was fascinated both by the inductive sensing and the haptic feedback, which felt a bit like a small hammer banging on the surface.

The design has three different actuators, I suppose it was the piezo actuator which gave the tactile feedback that I recall. Does anyone have an indication what part this is/was and where it can be obtained? Unfortunately, TI´s BOM and schematic do not list the piezo actuator used. There is a generic list of actuator manufacturers at www.ti.com/.../haptic-driver-actuators.page, but this did not exactly help either.

Thank you,

Max

  • 0
    TI__Expert 8721 points
    Hi Maximilian,

    That type of piezo is a piezo module. Unfortunately, the piezo module on that demo is no longer in production. Samsung Electro-Mechanics (SEMCO) and AAC Technologies were the vendors producing these modules in the past. I believe Mplus has taken over the SEMCO actuator business. Please reach out to Mplus and see if they are still producing the piezo modules.
  • 0 in reply to Kelly Griffin
    Prodigy 110 points
    Kelly, thank you. I will reach out to MPlus.
    In the meanwhile, do you have any suggestion for an alternative with similar performance? And could you maybe say a word about the waveform you used?

    Max
  • 0 in reply to Maximilian Gauger1
    TI__Expert 8721 points
    Hi Max,

    I did look around online for some similar modules, but I didn't see any. Piezo haptics was a little slow to start due to the high prices of piezo materials. This is why some companies are not producing the modules anymore. Companies like Mide and PI make piezo benders. The piezo module is just a piezo bender inside a housing. You could achieve similar performance using a piezo bender if you mount it correctly.
    As for the waveform, I'm not sure what was used in this design. Typically for haptic feedback, we use a sine wave at a frequency ranging from 150-250Hz. The output voltage is based on the piezo specifications.