Welcome to PhantomPilots.com

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

  1. dirtybum

    Joined:
    Apr 14, 2015
    Messages:
    3,314
    Likes Received:
    1,789
    I took four flights with my p4 with stock battery, then I took it completely apart and wired it for external batteries and put it back together. The very first long-range flight with it modded was perfectly normal from the start, took it out of 44,000 & back.
    That was yesterday I landed and packed it up like normal. Took it out today for another flight, flight number six, I got messages on the screen where you normally see "safe to fly GPS" that read "forward sensor calibration error"
    This only happens after I wait for safe to fly message and as soon as I lift off into the air! Just to be clear, I fly with the sensors turned off in the app .Upon inspection I noticed this, One of my forward sensors is not sitting perfectly centered in the shell. ImageUploadedByPhantomPilots1467043542.669204.jpg
    It's hard to get a picture of it that small but I think you get the idea. I have to assume this was like this when I put it back together and it didn't affect the first long-range flight at all. Any ideas, other than the obvious to take it apart and realign this.
     
  2. phxbird57

    Joined:
    Dec 14, 2015
    Messages:
    1,428
    Likes Received:
    407
    Location:
    Phoenix Az
    Do you think you moved it when you had the case open. How are the seniors anchored in to the case?
     
  3. dirtybum

    Joined:
    Apr 14, 2015
    Messages:
    3,314
    Likes Received:
    1,789
    They're all locked down onto the main assembly. There's a chance because my XT 60 connector comes out the front by the sensor on that side that my 16awg wire is squeezed in there not allowing the sensor to fully sit in the eyehole of the shell. I only noticed it after this error this morning, if it was done like during the mod how was I able to fly with no problems 44,000 feet and back? It doesn't matter, the fact is I got a problem and the only solution to start with is to take the bird apart again and realign that sensor lens with the eyehole in the shell! It just seems like it shouldn't matter since I have that collision avoidance sensor turned off in the app ImageUploadedByPhantomPilots1467045400.113221.jpg ImageUploadedByPhantomPilots1467045412.983177.jpg
    I suppose it's possible that this zip tie in image one didn't allow the shelves to halves to align properly. Although why did that not show up in the first flight after the mod
     
  4. phxbird57

    Joined:
    Dec 14, 2015
    Messages:
    1,428
    Likes Received:
    407
    Location:
    Phoenix Az
    can you do an IMU calibration with the P4.
     
  5. dirtybum

    Joined:
    Apr 14, 2015
    Messages:
    3,314
    Likes Received:
    1,789
    Yep did it ,didn't make any difference
     
  6. dirtybum

    Joined:
    Apr 14, 2015
    Messages:
    3,314
    Likes Received:
    1,789
    phxbird57 likes this.
  7. spraychaser

    Joined:
    Apr 1, 2016
    Messages:
    9
    Likes Received:
    0
    Anybody have any other ideas on how to fix the problem. I am also getting the same error. I have made Zero mods to my P4. It has been flown about 40 times now and now just in the last few flights sometime but not always when I fly it has the same error. Done a IMU cal and made no difference?
     
  8. dirtybum

    Joined:
    Apr 14, 2015
    Messages:
    3,314
    Likes Received:
    1,789
    Have you tried calibrating the vision sensor system like in that link
     
  9. phxbird57

    Joined:
    Dec 14, 2015
    Messages:
    1,428
    Likes Received:
    407
    Location:
    Phoenix Az
    Db did you figure it out?
     
  10. dirtybum

    Joined:
    Apr 14, 2015
    Messages:
    3,314
    Likes Received:
    1,789
    Worked on another drone for a new up and coming droner its gonna be windy tomorrow so I'll try recalibrating the vision sensor then
     
    Procharged97 likes this.
  11. phxbird57

    Joined:
    Dec 14, 2015
    Messages:
    1,428
    Likes Received:
    407
    Location:
    Phoenix Az
    I was out looking for my friends in the backyard. Only 5. Looks like we may get a little rain tonight. Nice light show.
     
    dirtybum likes this.
  12. dirtybum

    Joined:
    Apr 14, 2015
    Messages:
    3,314
    Likes Received:
    1,789
    O.k. I'm confused...and happy...maybe!
    Before I did the recommended forward sensor cali, I decided to remove the tape I had covering vps, you know I had it taped so I can strap external bat under there . I did notice one of the IMU's was SLIGHTLY off, so I started with an IMU calibration!
    I started motors and hovered at 20' and I DID NOT get any sensor error warnings!!! So , I taped the vps back up , fired it up & all good!! I strapped bats to the front & back to see if the big bats or power wire got in the way! Nope! I could not recreate it
    So I dont know what to expect on my next start, but for now I'm hopeful! I would like to say it was just the area that I was flying in that caused the problems, but when I first had the issue I packed it up and drove 2 miles away to another spot and had the same issue. Maybe it was a fluke, maybe the fact that I untaped the VPS, maybe it was the IMU calibration
    I can't pinpoint it or re-create it.
     

    Attached Files:

  13. phxbird57

    Joined:
    Dec 14, 2015
    Messages:
    1,428
    Likes Received:
    407
    Location:
    Phoenix Az
    I hate it when that happens. Because in the back of your head you're a always thinking .is it going to crash
     
  14. dirtybum

    Joined:
    Apr 14, 2015
    Messages:
    3,314
    Likes Received:
    1,789
    Yeah, is it going to "pop up" again when I'm 6 miles out!!??
     
    phxbird57 likes this.
  15. Procharged97

    Joined:
    Mar 14, 2016
    Messages:
    993
    Likes Received:
    358
    Location:
    Canterbury, CT
    What happens when that message pops up on the screen while your in the air? does it restrict certain things or try to land?

    Also do you think the tape over the sensors was causing it..didn't know if you had the tape on it when doing the calibrations. At least it's good for now right!!
     
  16. dirtybum

    Joined:
    Apr 14, 2015
    Messages:
    3,314
    Likes Received:
    1,789
    I have the forward sensors shut off in the app. I had to VPS sensor taped up. Last night in my driveway after I figured out that it was flying normal with all the tapes and external batteries removed, I went ahead and covered everything back up with tape and put batteries back on to try to re-create the problem. I could not re-create it no matter what I did. I just got safe to fly GPS.

    When I got that message before, it only happened directly after lift off, and the LEDs would flash green yellow red and while in hover it would swirl around like a bad compass
     
  17. dirtybum

    Joined:
    Apr 14, 2015
    Messages:
    3,314
    Likes Received:
    1,789
    Whether were talking drones, cars or appliances, I would rather a part just goes bad, then I have peace of mind when I change it
     
    phxbird57 likes this.
  18. phxbird57

    Joined:
    Dec 14, 2015
    Messages:
    1,428
    Likes Received:
    407
    Location:
    Phoenix Az
    OK Db send me the P4 and I'll run it though my testing. :cool: Just made sure you read the small print. I'm not responsible for any loss or broken parts and or damage.aka not responsible for anything. ;)
    I hope you find out what cause that.
     
  19. Procharged97

    Joined:
    Mar 14, 2016
    Messages:
    993
    Likes Received:
    358
    Location:
    Canterbury, CT
    yeah man that's weird... how long did you wait after it was fine to put the tape back on and batts?
     
  20. dirtybum

    Joined:
    Apr 14, 2015
    Messages:
    3,314
    Likes Received:
    1,789
    Landed it, restarted without tape once more, all good, landed put tape on vps, took off, all good, landed, strapped bats on, all good! Within 10 minutes