No data displayed, just 0's

Hi!

I can't get the OSD to show any values. They are all zeroes. Iv'e done a lot of googling but havent found the key yet.

MinimOSD v 1.1 with firmware 2.0. Updated charset. Bought a cable on Ebay to use telemetry at the same time.

APM 2.6 with Arducopter 3.1.

I switch it on, it says "Waiting for mavlink". I connect the telemetry. The previous text will go away and everything seems fine, all the text is there, but it is all zero/null values. The Heartbeat icon is flashing.

I read about the Arducopter not sending values by default, that you have to set the SR3-parameters. But like someone said, that are not there!

Also, going in to MissionPlanner / setup / Optional Hardware / OSD and clicking there, does nothing.

I tried using another MinimOSD that i took off of my Octocopter, that one shows the exakt same. But on the octo, it works with another APM 2.5.

I get the feeling that the APM is not sending out the data that the Minim needs to hear?

Please help, my hair is getting grey over this one...

Replies

Magnus von Rosen March 17, 2014 at 2:22am

Rolf,

thanks, you were right, it was the cable! Your suggestion to hook up only the radio got me thinking.

I exchanged TX and RX pins on the APM end with each other, and then also exchanged them on the Radio end.

After that, 100% difference. Both APM and telemetry works now.

Mind you, this was a cable i bought from Ebay, not one I built myself since I didn't want to fiddle with it. :)

Thanks!

/Magnus
Rolf Blomgren March 14, 2014 at 11:43am

check the TX connection from minimOSD, if this connection is missing you will only get the heartbeat message.

minimOSD sends request for the data that shall be returned by APM.
- Magnus von Rosen > Rolf Blomgren March 14, 2014 at 12:28pm
  
  Hi Rolf,
  
  thanks for the reply: My splitter cable indeed has only the RX connection to the MinimOSD. The Telemetry-unit has both RX and TX.
  
  Are you quite sure that both MinimOSD and Telmetry should have both RX and TX when used in parallell?
  
  As mentioned here: http://copter.ardupilot.com/wiki/common-minim-osd-using-with-a-grou...
  
  This is the cable I'm using: http://www.ebay.com/itm/251416147164?ssPageName=STRK:MEWNX:IT&_...
  
  Thanks again!
  
  /M, Sweden
  - Rolf Blomgren > Magnus von Rosen March 14, 2014 at 12:59pm
    
    Ok, if you have a radio telemetry connected then this should do the request to the APM (no TX from minimOSD) but first after connecting to Missionplanner or some other groundstation software.
    - Magnus von Rosen > Rolf Blomgren March 14, 2014 at 1:00pm
      
      That's how I read it too. The connection to Mission Planner works well.
      - Rolf Blomgren > Magnus von Rosen March 14, 2014 at 1:07pm
        
        is both LED's on the minimOSD on?
        
        Magnus von Rosen > Rolf Blomgren March 14, 2014 at 1:09pm
        
        Yes. It reads the heartbeat when I connect to Mission Planner. It just doesn't read any values from it.
        
        The display is fine, nice and sharp letters and the heartbeat symbol is blinking.
        
        Rolf Blomgren > Magnus von Rosen March 14, 2014 at 1:13pm
        
        do you get the telemetry data in Missionplanner?
        
        Magnus von Rosen > Rolf Blomgren March 14, 2014 at 1:27pm
        
        Seems I can't reply to the latest response, so I'm responding in the wrong order here..
        
        I suspected the cable as well, and moved the RX wire to the TX position, but then I did not get any mavlink connection at all. When it is in the original position, as mentioned, I get a mavlink connection. Just no data.
        
        Rolf Blomgren > Magnus von Rosen March 14, 2014 at 2:03pm
        
        if you are using the 3DRobotics radio telemetry try connecting just the minimOSD directly using the cable used for the radio telemetry on the APM.

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