Why not just use a Ping))) which is often used with the Arduino? It's a 40Hz basic ultrasonic sensor. You pulse it using one of the digital IOs and then you switch it over immediately for an echo.
Why not just use a Ping))) which is often used with the Arduino? It's a 40Hz basic ultrasonic sensor. You pulse it using one of the digital IOs and then you switch it over immediately for an echo.