Downward braking distance not changed correctly

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Dejan Dobnikar

• 2023年07月25日 16:43
• 已编辑于

Hello,

When changing the braking distance for direction `DOWNWARDS`, the actual braking distance is not changed correctly. The method used to change braking distance is

perceptionManager.setObstacleAvoidanceBrakingDistance(distance, PerceptionDirection.DOWNWARD, callback)

The decimal part of the distance is truncated, for example, when setting braking distance to 1.9, it will be actually set to 1 when reading perception info using `perceptionManager.addPerceptionInformationListener`. The same is for e.g. 0.7, the braking distance received from the listener will be set to 0. There is no error returned, `onSuccess` callback is called. If distance is set to 1 or 2, then it works ok, values are not changed.

Zero is not even in the valid range according to the docs:
https://developer.dji.com/api-reference-v5/android-api/Components/IPerceptionManager/IPerceptionManager.html#iperceptionmanager_setobstacleavoidancebrakingdistance_inline 

Are valid ranges in the link above the same for all drones?

Changing braking distance for `PerceptionDirection.HORIZONTAL` or `UPWARD` works OK.  Is this a SDK issue or am I missing something?

 

SDK: v5.4.0

Drone: Mavic 3T

Thank you for your help

 

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  DJI Developer Support

  • 2023年07月26日 11:39

  You have the option to upgrade to version 5.5. We have fixed the issue you mentioned in this version.

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  Dejan Dobnikar

  • 2023年07月27日 19:59

  DJI Developer Support I just checked and can confirm that behavior is better, but I noticed some small 'misupdates', only for some values:

  when set to 0.9, it's actually set to 0.8, and some other values change as well (e.g. 1.4 -> 1.3).

  But some values are set ok and not changed, e.g. 1.7.

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  Dejan Dobnikar

  • 2023年07月27日 21:24
  • 已编辑于

  One more question, is there a way to get valid ranges for braking/warning distances for each drone?

  DJI Pilot 2 shows different braking/warning ranges for different drones, and I'd like to avoid setting invalid values.

  For example, according to the docs, the range for horizontal warning distance is between 1.1 and 33.0, but DJI Pilot 2 shows a horizontal warning range between 1.1, and 16.0. Can I expect that distance of 33 will work with every drone?

  Thanks!

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  DJI Developer Support

  • 2023年07月28日 09:47

  I just checked and can confirm that behavior is better, but I noticed some small 'misupdates', only for some values: when set to 0.9, it's actually set to 0.8, and some other values change as well (e.g. 1.4 -> 1.3). But some values are set ok and not changed, e.g. 1.7. -->Is this also about the M300? One more question, is there a way to get valid ranges for braking/warning distances for each drone? DJI Pilot 2 shows different braking/warning ranges for different drones, and I'd like to avoid setting invalid values. --> there is no interface available in the SDK to retrieve the information you are looking for. However, you can refer to the scope provided in Pilot 2 for guidance.

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