Interfacing a Piezo Switch


#1

Hi,
I have scored some piezo push button switches from an old heavy duty intercom and I would like to interface them to a Particle Photon.
They look a little like this: https://uk.rs-online.com/web/p/products/0224350/
(no LED inside the light).
From connecting a multimeter, it seems they are momentary action and produce a small voltage spike - around 0.005V

Does anyone have any suggestions regarding circuitry to interface the switch to a Particle Photon and how to use it as an interrupt driven switch?

Thanks!
Brad


#2

Would be good to know the exact type.
If your switches work the way as the ones you linked to then they should be used just as any other N/O switch (look at the datasheet provided on that linked site).


#3

Hi Brad
I work for a company that distribute piezo switches - in my experience they work similar to standard momentary SPST momentary switches. But don’t work great if you are trying to “time the press” (hold 3 seconds one function. Hold 6 seconds another function etc…) You need a specific configured piezo switch for this.
Not sure if this effects you at all - but if you are using low voltage low current and you just want to know if they have been pressed - they should be fine
Thanks
Rob


#4

Thanks all. I managed to work it out using your advice. The code definitely needed some denouncing but it works.