Anonymous
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Jan 20, 2016
08:55 AM
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Jan 20, 2016
08:55 AM
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?
6 Replies
Jan 20, 2016
11:58 AM
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Jan 20, 2016
11:58 AM
You need to do a level-shift so that all values are positive. Use an R-ladder.
Bob
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Jan 21, 2016
12:01 AM
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Jan 21, 2016
12:01 AM
Anonymous
Not applicable
Jan 21, 2016
01:55 PM
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Jan 21, 2016
01:55 PM
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.
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Jan 21, 2016
11:32 PM
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Jan 21, 2016
11:32 PM
Jan 22, 2016
06:07 AM
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Jan 22, 2016
06:07 AM
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?
Jan 22, 2016
08:42 AM
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Jan 22, 2016
08:42 AM
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.