Its a little tricky since producing a sine wave at high frequency on an arduino without extra hardware is hard. Likewise adjusting it finely is also hard. Als

Its a little tricky since producing a sine wave at high frequency on an arduino without extra hardware is hard. Likewise adjusting it finely is also hard. Also if you have a sensor and not a plain transducer, you can't change its programming. Also, piezoelectric transducers can have a somewhat limited frequency range. I've actually been looking into making some high quality sonar equipment from scratch, but getting good datasheets on ultrasonic transducers has been a royal pain in the butt.