PSoC 4 MCU

[Anonymous]

I'm looking for a way to read piezo vibrations in a constant stream, both positive and negative AC voltage signals.  How would I set that up with the ADC to get the correct readings?

[JoMe_264151]

You need to do a level-shift so that all values are positive. Use an R-ladder.

       

Bob

[EvPa_264126]

for example, you can do so

   

[Anonymous]

That looks pretty fancy, but perhaps I posted in the wrong forum or wasn't specific were I should have been.  I'm using a PSoC4-BLE.

[EvPa_264126]

Sorry, this is my carelessness.
Another variant.

[Anonymous]

Awesome!  Thank you very much.  I will give this a try.  So I guess t he output from the opAmp would run to the ADC?

[EvPa_264126]

Yes, next - ADC.
You need to calculate resistors  so to get into the range of the ADC.
R2 and R3 - determine the amplification of the signal,
U (Pin_5) - shifts the signal to the positive region.