&quot; computer that can run a MHz frequency transducer is easy and cheap these days, e.g. a raspberry pi’s GPIO pins can run that frequency.&quot;<p>Yeah, but actually you need an ADC that runs at MHz frequencies and a frontend amplifier to capture the signal and put it into the ADC<p>Definitely this falls into the &quot;not expensive&quot; category, but not in the &quot;trivially cheap&quot; one