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Test Sonar wiring Shield Perfect No Noise

Today I'm test sonar my Arducopter in ALT Hold Mode. I use USB HUD cable (Have Shield) connect to Pitot port IMU and receive signal from AN (pin 3) the Sonar. It perfect not noise in test.

Now, I use code ArduCopter2.0.39b 


Wiring shield to ground at Sonar.




And connector to Pitot port IMU.





Installer to sonar mount under main frame.



3689422726?profile=originalRed line is Sonar Alt , Green line is Baro Alt




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