Welcome to PhantomPilots.com

Sign up for a weekly email of the latest drone news & information

Litchi help...Focus on POI during a waypoint mission.

Discussion in 'Pro/Adv Discussion' started by n6vmo, Oct 13, 2015.

  1. n6vmo

    Joined:
    Feb 26, 2015
    Messages:
    484
    Likes Received:
    156
    Location:
    Lompoc, CA.
    Mission #1
    I created a multiple waypoint mission with a POI centered over a local park pond. The mission progressed fine, but as it overflew the POI (pond) the camera focused on the next WP.

    Please review my mission videos and load the missions into your Android device and review my mission settings. I really want the camera to focus on the POI the entire mission.

    http://www.n6vmo.com/Litchi/POI Missions.zip



    Mission #2
    Another simple mission with just two WPs and a POI in the center. Again the mission went well, but after the overflight, the camera focused on the next WP instead of the POI.





    Thanks.
     
    #1 n6vmo, Oct 13, 2015
    Last edited: Oct 13, 2015
  2. tomtnt

    Joined:
    Oct 11, 2013
    Messages:
    211
    Likes Received:
    69
    can you just post a screenshot of your mission
     
  3. RoyVa

    Joined:
    Apr 10, 2015
    Messages:
    2,246
    Likes Received:
    449
    Location:
    Virginia
    I'm not understanding something here. You ar mixing GS flying with POI flying. Don't believe the app was designed to mix them. I think if you fly out to a location manually or initiate the POI as long as you are within controller range the POI works flawless. The way point flying and POI flying are two different tab in the app. I have flown both GS and POI as separate flights but have not had a POI work in the middle of a Way Point flight. Even the videos at the Litchi web site show them as different functions. Am a missing something here or are they two differs functions.
     
  4. joebar.rc

    Joined:
    Aug 24, 2015
    Messages:
    38
    Likes Received:
    9
    Can't see if your mission has only waypoints or also focus points
    But.. You want to keep the focus on the poi and can do that by placing a focus point. (Right corner , left of the pencil icon)
    In the 2nd wp you can tell to focus on that. If that doesn't help, set a focuspoint way beyond the path and keep the setting focus on closest


    Sent from my iPhone using Tapatalk
     
  5. n6vmo

    Joined:
    Feb 26, 2015
    Messages:
    484
    Likes Received:
    156
    Location:
    Lompoc, CA.
    Screenshot_2015-10-14-04-34-42.png Screenshot_2015-10-14-04-35-45.png

    The screen shots will not detail how the mission is configured. Someone will need to extract the zipped mission files, connect an Android device to their PC and place the extracted missions into the Litchi/missions folder. Then the mission parameters can be reviewed.
     
  6. n6vmo

    Joined:
    Feb 26, 2015
    Messages:
    484
    Likes Received:
    156
    Location:
    Lompoc, CA.
    The screen shot is of the GS Mission maker. It does have the capability of adding a POI, it is the top left most tool button.
     

    Attached Files:

  7. ParsnipHysorter

    Joined:
    Sep 28, 2015
    Messages:
    220
    Likes Received:
    174
    Litchi has the ability to focus on POIs during a GS mission, according to their website, and I believe that is what the OP is trying to do.

    OP I have not tried it. But have you followed the instructions on the Litchi site regarding POIs during GS missions? It mentions setting "Focus Nearest POI", maybe you don't have that set. Help - Litchi
     
    2FST4U likes this.
  8. tomtnt

    Joined:
    Oct 11, 2013
    Messages:
    211
    Likes Received:
    69
    1. are you sure you have it set to waypoint defined and not toward next waypoint for heading mode?
    2. the asymmetric placement of the POI in relationship to WP#1 and WP#2 is problematic even when set correctly. the phantom Groundstation waypoint SDK isn't "aware" of litchi's POI. it only knows what the two set yaw orientation are and will smoothly transition between those angles.

    So basically, it knows to face West at WP#1 and face East at WP#. halfway between WP#1 and WP#2, it will be facing north (or south). it doesn't really know where your POI is.. a better way to configure it is with 3 WP. WP1 @start, WP#2 at beginning edge of lake and WP#3 at the other end of the lake.

    At any rate, it looks like your main issue is #1 - it is set for towards next waypoint and not "waypoint defined"
     
  9. n6vmo

    Joined:
    Feb 26, 2015
    Messages:
    484
    Likes Received:
    156
    Location:
    Lompoc, CA.
    Yes, I have that set to "Focus Nearest POI".
     
  10. n6vmo

    Joined:
    Feb 26, 2015
    Messages:
    484
    Likes Received:
    156
    Location:
    Lompoc, CA.
    You may be correct. I just checked and the 'Heading' was set to 'Toward Next Waypoint'. Just changed it to 'Waypoint Defined', but may need to put a waypoint in the middle of the pond instead of a POI.

    I will try a test flight after work. Thanks.
     

    Attached Files:

  11. tomtnt

    Joined:
    Oct 11, 2013
    Messages:
    211
    Likes Received:
    69
    yes, focus nearest POI refers to the gimbal pitch. Heading refers to the aircraft yaw....
     
  12. ParsnipHysorter

    Joined:
    Sep 28, 2015
    Messages:
    220
    Likes Received:
    174
    And the other instructions on the Litchi Help page, did you carefully follow those? Also
    Yes, this is the very thing the Litchi help page mentions. Their website actually has fairly decent instructions on how to use their app.
     
  13. n6vmo

    Joined:
    Feb 26, 2015
    Messages:
    484
    Likes Received:
    156
    Location:
    Lompoc, CA.
    Read the Litchi Help section again and tried testing with the settings recommended.

    The first flight to the pond was using the same mission, but with 'Waypoint Defined'. The P3A started the mission OK, but soon after, the craft slowly yawed to the right. It was if it was trying to focus the camera on a non-existent WP or POI. I didn't finish the mission and brought the craft close to the Home Point.

    Next mission was a repeat of the simple two WP mission from the day before, but with 'Waypoint Defined'. The mission progressed, but the craft seemed to point at a POI several 100' from the programmed POI, and it did not even hold that point in the center of the camera. The POI was in the center of the RC track.

    Next mission was developed from scratch, similar to the simple two WP with a POI in the center of the RC track. Once again the craft did not keep the POI in the center of the display.

     
  14. tomtnt

    Joined:
    Oct 11, 2013
    Messages:
    211
    Likes Received:
    69
    Post your mission screenshots!

    you need to remember that the AC doesn't know about your POI! DJI SDK has no concept of a POI. the POI is essentially a guide for setting your yaw angles. you have to be strategic about placing waypoints depending on what you are trying to accomplish
     
  15. n6vmo

    Joined:
    Feb 26, 2015
    Messages:
    484
    Likes Received:
    156
    Location:
    Lompoc, CA.
    The 'X' is where the P3A appeared to focus its attention during the first and second missions in the video.
     

    Attached Files:

  16. n6vmo

    Joined:
    Feb 26, 2015
    Messages:
    484
    Likes Received:
    156
    Location:
    Lompoc, CA.
    Please download that mission, modify it so that the camera will focus on the white trailer as it flies from WP #1 to WP #2. Zip it up and email it to me so I can better understand what needs to be done. I have read the Litchi Help section, but I am more than likely not understanding.
     
  17. tomtnt

    Joined:
    Oct 11, 2013
    Messages:
    211
    Likes Received:
    69
    ignore the POI and think about the WP since the P3 doesn't actually know about your POI. it only knows about the angle at WP#1 and the angle at WP#2. it then slowly rotates from angle #1 to angle #2 throughout the entire path.

    if you want it to actually focus at that small point, you need 4 way points.

    WP#1 beginning
    WP#2 infront of white trailer
    WP#3 behind white trailer
    WP#4 ending

    in this example - it will fly straight from WP#1 to WP#2 - it won't try to yaw yet.. in flying straight, it will still be aimed at your POI. at WP#3, it will begin to yaw until it reaches the angle set at WP#3. From WP#3 to WP#4 it will fly straight back maintaining focus on the POI.

    basically, you are trying to tell your P3 to turn too early
     
  18. n6vmo

    Joined:
    Feb 26, 2015
    Messages:
    484
    Likes Received:
    156
    Location:
    Lompoc, CA.

    Yes, I just read and then reread the Litchi Help and set up a WP mission with many WPs. As I stepped from WP to WP, it became clear. Thanks.
     
  19. tomtnt

    Joined:
    Oct 11, 2013
    Messages:
    211
    Likes Received:
    69
    sorry for the crappy screen capture -copied wrong orientation

     
  20. Mike_fnq

    Joined:
    Mar 12, 2016
    Messages:
    3
    Likes Received:
    0
    I have a similar issue in that the heading is not changing throughout the flight and the aircraft maintains the heading it had going to the first waypoint.