CS8 osd question/issues.

Discussion in 'Cinestar 8' started by Sam Donaghy Bell, Jan 22, 2015.

  1. Sam Donaghy Bell

    Joined:
    Sep 6, 2013
    Messages:
    106
    Likes Received:
    1
    My osd from CS8 has an issues.

    1. The battery voltage on the OSD constantly reads 12.0V. I run off two 22.2V 10,000mah batteries at a time..
    I got the CS8 RTF so I'm not totally up on everything under the hood but nothing jumps out at me.

    Any ideas?

    Thanks
     

    Attached Files:

  2. Andy Johnson-Laird

    Andy Johnson-Laird Administrator
    Staff Member

    Joined:
    Jul 31, 2012
    Messages:
    10,356
    Likes Received:
    1,161
    Sam: I'm not sure which model of OSD you have -- but you may have to go back to the vendor from whom you got the RTF, I'm afraid. There's not enough information to answer your question, I'm afraid.

    Andy.
     
  3. Sam Donaghy Bell

    Joined:
    Sep 6, 2013
    Messages:
    106
    Likes Received:
    1
    Thanks Andy,

    What other info would you need? I have a DJI OSD mk2.

    It's strange cos all the other info is correct like the pitch and roll and height etc.
     
  4. Andy Johnson-Laird

    Andy Johnson-Laird Administrator
    Staff Member

    Joined:
    Jul 31, 2012
    Messages:
    10,356
    Likes Received:
    1,161
    I'm not familiar with the DJI OSD Mk 2, but based on http://www.dji.com/product/iosd-mark-ii (which shows a voltage of 24.1 on the screen), that would suggest that there may be a wiring problem with the way that it is connected into the system such that it's only seeing 12v. Or you have a faulty unit perhaps?

    Hope that helps.
    Andy.
     
  5. Sam Donaghy Bell

    Joined:
    Sep 6, 2013
    Messages:
    106
    Likes Received:
    1
    I could try another unit. I have a second one here. Where does the osd actually take its reading from? It's being powered by the 12V outputs I have on the CS8 but it is plugged into the GPS hence why I'm getting the rest of the info..
     
  6. Andy Johnson-Laird

    Andy Johnson-Laird Administrator
    Staff Member

    Joined:
    Jul 31, 2012
    Messages:
    10,356
    Likes Received:
    1,161
    Sorry...I don't know, Sam. Is there any documentation for the OSD? It seems to me that there should be a point where it is connected directly to the LiPo itself -- if it's connected to the output of a BEC/DC-to-DC converter, then it can only report the output from that converter and never the LiPo voltage. But I'd need to see the documentation that describes how the OSD should be connected up.

    Andy.
     
  7. Steve Maller

    Steve Maller UAV Grief Counselor

    Joined:
    Oct 30, 2012
    Messages:
    3,979
    Likes Received:
    807
    Sam, the DJI OSD should be connected to the DJI CAN HUB unit, which is fed from the flight control, which in turn should be directly connected to the main power source (through a power distribution board or something). This way it can "see" the mains' voltage. I suspect what happened is that whoever wired up the copter put the OSD on the "wrong side" of a BEC or 12V source. It needs to be able to sense the LiPo directly.

    This is what I do in my 6S DJI quadcopter that uses a DIO iOSD mini. I suspect the Mk II is the same. If this makes little or no sense (if you bought a fully-kitted RTF for example) you probably have to get the folks who built it for you to correct this error. It's not something you want to do if you're not very familiar with these things.

    I'm not sure which system you're using, but here's how it's done with a NAZA. It's probably similar with the WKM and A2.

    [​IMG]
     
  8. Andy Johnson-Laird

    Andy Johnson-Laird Administrator
    Staff Member

    Joined:
    Jul 31, 2012
    Messages:
    10,356
    Likes Received:
    1,161
    Steve: That makes sense to me. But I wonder what the RTF vendor connected the iOSD to?

    Andy.
     
  9. Steve Maller

    Steve Maller UAV Grief Counselor

    Joined:
    Oct 30, 2012
    Messages:
    3,979
    Likes Received:
    807
    If Sam can supply detailed photos of his setup we can probably figure it out.
     
  10. Andy Johnson-Laird

    Andy Johnson-Laird Administrator
    Staff Member

    Joined:
    Jul 31, 2012
    Messages:
    10,356
    Likes Received:
    1,161
    I agree, Steve.

    Sam: Did the RTF vendor provide you with any documentation about the build?

    Andy.
     
  11. Sam Donaghy Bell

    Joined:
    Sep 6, 2013
    Messages:
    106
    Likes Received:
    1
    Hi guys!

    Thanks for all the info! If you give me a sec I'll get some photos for you. It was an RTF so I didn't see under the hood myself I'm not totally up on it all but I'm not too bad.

    Sam
     
  12. Sam Donaghy Bell

    Joined:
    Sep 6, 2013
    Messages:
    106
    Likes Received:
    1
  13. Sam Donaghy Bell

    Joined:
    Sep 6, 2013
    Messages:
    106
    Likes Received:
    1
    These photos might be more helpful!

    I think I can see the problem myself. Not sure how to fit it though. IMG_5857.jpg IMG_5858.jpg
     
  14. Sam Donaghy Bell

    Joined:
    Sep 6, 2013
    Messages:
    106
    Likes Received:
    1
    This one might be the best view. IMG_5859.jpg
     
  15. Sam Donaghy Bell

    Joined:
    Sep 6, 2013
    Messages:
    106
    Likes Received:
    1
    Some photos below thanks Steve!
     
  16. Andy Johnson-Laird

    Andy Johnson-Laird Administrator
    Staff Member

    Joined:
    Jul 31, 2012
    Messages:
    10,356
    Likes Received:
    1,161
    Sam: Just out of curiosity, can you not contact the RTF vendor and ask? The only reason I say that is that it would be a lot more reliable than us trying to look at images and make informed guesses as to how things are wired... :)

    Andy.
     
  17. Sam Donaghy Bell

    Joined:
    Sep 6, 2013
    Messages:
    106
    Likes Received:
    1
    Yeah. I couldn't get hold of him yesterday and was trying to sort it then. I have his number now thanks. Anything just out at you?

    Thanks,

    Sam
     
  18. Steve Maller

    Steve Maller UAV Grief Counselor

    Joined:
    Oct 30, 2012
    Messages:
    3,979
    Likes Received:
    807
    The second photo quite clearly shows the OSD's power coming from a 12V tap on the PDB. The power needs to come from the "mains" in order to properly see the main voltage.

    IMG_5859.jpg
     
    Andy Johnson-Laird likes this.
  19. Andy Johnson-Laird

    Andy Johnson-Laird Administrator
    Staff Member

    Joined:
    Jul 31, 2012
    Messages:
    10,356
    Likes Received:
    1,161
    Nice work, Mr. Maller.
    Andy.
     
    Sam Donaghy Bell likes this.
  20. Steve Maller

    Steve Maller UAV Grief Counselor

    Joined:
    Oct 30, 2012
    Messages:
    3,979
    Likes Received:
    807
    Quite the compliment from you, oh High Priest Of Forensics. :rolleyes:
     

Share This Page