I designed an ultrasonic system with piezoelectric on 1MHz frequency with AVR microcontroller.
I want to design a system that able to find contact of piezoelectric with surface!!!
In other words,I want to apply contact control or coupling control on this system.
On this issue,My idea is that I design a analog circuit that measures voltage variation with Load and free.Next feed it to the microcontroller and use this.
Am I true?
Please let me know your opinion about this issue.