I am trying to make a pressure sensor to use with my raspberry pi zero. I would like to avoid making another purchase, so while an ADC or FSR would be easier I would like to figure this method out.
Basically, I am trying to read a change in pressure using a piezo transducer on my raspberry pi. This is problematic because Pi is digital, and I cant measure voltage change accurately.
However, I found this method of measuring capacitance (using timer): this article
I was wondering if I would be able to use the piezo transducer as a capacitor whose capacitance is dependent on pressure change.
Here is a diagram of the ciruit I have in mind:
Would this possibly work?