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APM 2.5 + 3DR Telemetry + MinimOSD

Posted by Larry on August 26, 2012 at 5:14pm

APM 2.5 plus the 3DR radio telemetry works great, now I want to add my MinimOSD board.

The MinimOSD board reads MAVLink messages from its RX pin and request rates from APM on the ArduPilot "telem" port. (Port 0 implied). The APM2.5 board 3DR radio connector (UART0/2) pin out from the board edge counting inward is: Gnd, (blank) RX, TX, +5V.

The MinimOSD Introduction has a diagram which states APM telemetry port (pins sequence from bottom) (shows bottom of block diagram of Port) This presumes that it is also board edge of back of APM2.5  and shows (APM pins) counting inward as:  Gnd, (space) +5v, out, in.  (out to rx of OSD, in to TX on OSD). The silk screen on the APM2.5 is clear, and I believe +5v is the most inside (away from edge) pin of Port 0. Should I just wire my OSD up based on what the APM says about Port 0 pins?

Is the diagram in MinimOSD introduction wrong on its cabling to APM telem port?

I am eager to add my MinimOSD to my build, but do not want to fry or brick my OSD.

Hope this helps someone in clearing this up somehow.

It would have been handy to have had another connector like 3DR for the feed to the MinimOSD.

In the meantime I guess I just hack into my 3DR cable or solder to tiny pins on back of APM2.5.

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Tags: apm25, minimosd
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Replies

  • Fried January 4, 2015 at 12:17am

    Ok, this is good Recommendation.

  • Muhammad Abdul Hadi August 5, 2014 at 5:51am

    Hi guys, I was wondering if anyone has tried the radio and minim cable that are available from 3DR and also from the net? I have used them and even hacked one to work with the new radios from 3DR, which can work with android mobiles and tablets via droidplanner etc, that way I can move the radios in between my discovery (APM 2.5) and my fortis titan (Pixhawk).

    The cables are even labelled for radio and osd.

  • FCasoy August 4, 2014 at 3:10pm

    Hi,

    Have you got solution for this issue?

    • VOT PR > FCasoy December 17, 2014 at 5:33am
      Hi

      Have the same situation with telemetry & OSD...

      Are you resolve your problem???

      Thanks..
      • Marcin Krawczyk > VOT PR December 17, 2014 at 5:42am

        What is your problem? This is rather simple circuit.

        Of course you have to set correct SR* params:

        https://code.google.com/p/minimosd-extra/wiki/APM

        • VOT PR > Marcin Krawczyk December 17, 2014 at 8:44am
          No data on OSD... telemetry air radio not pair with ground radio...stock on getting parameters MP...

          some photos attached...

          Y cable
          From APM to telem radio 5v to 5v
          Gnd to Gnd
          Tx to Rx-----yellow cable
          Rx to tx-----green cable

          From APM to OSD 5v to 5v
          Gnd to Gnd
          Rx to Rx-----green cable

          Also already put a SR parameters...

          Appreciate your help..
          Gracias

          trim.011407D5-A477-43DC-9C6E-1BF749F4ACDB.MOV

          image.jpg

          https://storage.ning.com/topology/rest/1.0/file/get/3702874699?profile=original
          • L > VOT PR January 3, 2015 at 10:53pm

            I'm seeing the same issue with zero data on OSD. Data out from the APM telemetry port goes via Y to both the radio and the OSD data input. When the telemetry radios are connected the flight data appears correctly in Mission Planner or APM Planner. The OSD data LED is blinking in sync with the telemetry data. However, all the flight data is showing as zeros on the OSD display (there is a clock counting up). Any suggestions? Thanks!

          • Marcin Krawczyk > VOT PR December 17, 2014 at 10:47am

            Pair radios first. You will go no further without that.

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