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DJI A2 flight controller Automatic TakeOff without any user input
82 0 1-10 08:26
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msm1122
lvl.1
Pakistan
Offline

Good Day,

We are using DJI A2 flight controller with its datalink and ground station software in our hex-rotors (refered as bird in this discussion) for more than 3 years.
Today, we experienced something new for the first time i.e the drone automatically takes off randomly without any input from ground station software or RC and starts hovering at an altitude of 6-7 meters until we take over control via RC and land it manually.
The  behaviour was similar to clicking 'one click takeoff' button. But in this case no button was clicked.
Also, on our iOSD display, the flight mode displayed was 'Toff' during these automatic takeOffs.


The phenomena occurred 9 times in a row. The details are as follows

First Incident:
  • Bird was powered on as always with battery at 24.5 Volts and GPS satellites of  12
  • Ground station software was opened and connected to bird via datalink
  • Editor tab was opened to make a waypoint mission
  • While the operator was making the mission, the bird took off automatically and started hovering at height of 6-7 meters
  • We took over the control via RC and landed it


Second Incident:
  • We closed ground station software and opened it again
  • Again tried to connect to bird but this time the software could not connect to bird
  • Meanwhile (while we were trying to connect to bird), the bird took off to a height of 6-7 meters and started hovering
  • Again we took over the control via RC and landed it



Third Incident:   
  • We restarted the bird by disconnecting the battery and connecting it again
  • Laptop was also restarted
  • Ground station software was opened and connected to air end
  • The bird again took off to a height of 6-7 meters and started hovering
  • Again we took over the control via RC and landed it


Fourth Incident:

  • Just after 1-2 minutes of landing after third incident, the bird again took off and started hovering
  • Again it was landed via RC
After the fourth incident we removed the propellers to avoid any mishap and started checking the flight controller configurations



FifthIncident:  
  • We connected the bird LED with laptop via android cable and opened A2 Assistant v1.9 to check for any errors or calibrations
  • Meanwhile the ground station software was running in background and DJI datalink connected.
  • Again the bird armed it self and motors started rotating very fast. However, no props were installed so we simply disconnected the battery


SixthIncident:  
  • We did RC calibration just to be sure if may be due to RC calibration the bird was behaving this way
  • We disconnected the cable between LED and laptop and closed A2 assistant software.
  • Ground station software was opened and again we connected the air end
  • Again the bird armed it self and motors started rotating very fast. However, no props were installed so we simply disconnected the battery

SeventhIncident:  
  • Ground station software was opened and again we connected the air end
  • We made a small mission of two waypoints and uploaded to the bird
  • After successful uploading of mission, the 'GO' button turned red (means it is ready for take off)
  • Before we press 'GO' button, again the bird armed it self and motors started rotating very fast. However, no props were installed so we simply disconnected the battery


EightIncident:  
  • When we connected Ground station software to air end the motors got armed.



NinthIncident:  
  • Actions of seventh incident occurred again.and same problem faced.


Based on above incidents,
  • can someone please guide us what could have gone wrong with our configurations?
  • Also, during these rehearsals, we changed the bird and found out that the phenomena occurs with that one special bird only. So there must be some problem with that flight controllerler?
  • How to solve this issue of automatic TakeOffs?
  • How to avoid this problem if it occurs in future with some other bird?







1-10 08:26
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