When connecting the 5V of usb / serial adapter and the red line of sonar, sonar starts blinking.
And I did some troubleshooting. (http://docs.bluerobotics.com/ping-viewer/faq-and-troubleshooting/#troubleshooting
)
The serial port display is displayed but the depth output is not output.
Also, How is the connection method
sonar ⇔ arduino MEGA (UNO) ⇔ adapter ⇔ usb cable ⇔ PC (Ping viewer)
Or
sonar ⇔ adapter ⇔ usb cable ⇔ PC (Ping viewer)
？
Neither has depth in Ping viewer.