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Sonar ALT_Hold Issue

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Hello there,

Yesterday, i added a new senor onto my quad, MaxSonar MB1260 XL for better altitude hold. Before attaching and re-uploading the ArduCopter 2.7.3 onto the APM 2. I erased and reset the board. And then attached sonar as described in the wiki manual. And uploaded the code and followed all initial steps (Of course i enabled the sonar). Everything went smooth. 

Next step, time for test fly. It flew great in Stable mode. However, as soon as i toggled the ALT_Hold switch ON. Quad started acting strange. It kept climbing higher n higher and suddenly dropped out of nowhere. Luckily i managed to control by toggling the switch back to stable mode.

I have checked everything couple of times now. All connection looks good. Mission Planner looks ok. I don't know what the problem. Your help would be so much helpful. I have attached couple of videos below. Please take a look at them. If you need any other information let me know. Thank you.

Quad Setup:

  • DJI F450 Frame
  • HackerStyle 20-22L Motors
  • Turnigy TY-P1 25Amps ESC (Flashed with SimonK firmware)
  • ArduCopter 2.7.3
  • MB1260 XL - Sonar 
  • 4000mah 20C 3Cell Battery
  • DX7 with AR7000 
  • Using one of four ESCs to provide power to the APM 2. 

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Cheers,

-Keyur

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