Good day guys !!  

I feel the need to obtain the information from my PixHawk in my Graupner MZ-24 screen. I found
some threads talking about a change in arducopter firmware to run the telemetry, not good at messing original controller firmware.

Then I found an "adapter" that staff of the AutoQuad made to convert the MavLink in Hott telemetry.

I come here to share a few changes I made in the project Mav2Rott downloaded here:
This is an adaptation to send the telemetry PixHawk for Graupner Hott Protocol.

Is correct with some features:

Battery Voltage;
Altitude for barometer;
Satellite count Speed;
Flight Modes Current drawn by the motor;
Direction of the Head;

I am not able to make it work:

Correct display Latitude and Longitude;
Distance of Home;
Direction of Home;

If anyone can help thank you very much.
The project is attached to the topic. The connections are equal to the jd-ioboard. I am using an Arduino Pro Mini.

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    • i have tried months ago, but i cant succes. i will try hex files again, because i cıuldnt compile others with arduino.

  • can i learn schematic diagram of connections ?

  • Hello Marcelo!

    I tested your sketch yesterday. Works!

    One thing i noticed is the heading. It must be sent in 2 degree steps. I get a heading from~ 1-140°

    Hello Michel!

    How can i flash the hex file to my Pro mini? Do i need a special ISP?

    • Hi

      You don't need any ISP. As these boards usually come with bootloader already installed, so you don't need any ISP, only serial port (eg. FTDI cable etc).

      Just use google search how to flash hex into arduino board. It's easy. If you have serial cable (and you should have if you are able to test and flash sketches), use it with AVRDude, which you should also have installed with arduino IDE.

      There are several free GUIs for AVRDude on the net.

      • Hello Michel,

        I'am testing and i'd like to have failsafe indication (battery, ...), fence breached ...  with message and sound on my mx20.

        Did you develop it ? Could you share your code ?


        • See newer version 1.3 with many of your ideas implemented.

          This version uses only pin 3 due to int1 usage.


        • Hi pix,

          Yes I developed this code based on Adam Majerczyk's and MinimOSD code.

          I plan to share it, but nowadays it doesn't look good enough.

          What features exactly do you need?

          In fact it's possible to display a string of text at the bottom of MX-20 summary screen (I display flight mode text there) and trigger alarm.

          There is battery voltage indication and also battery low alarm which is autocalibrated at power-on assuming battery connected is not exausted.

          If you know how to get fence breached info from mavlink stream, tell me and I'll implement this feature.

          Also if fence guard is enabled you'll see flight mode changed when autofence is triggered.

          • Hi Michael,

            is there any progress in development of this useful software? Sharing would be great and would allow further branches.  

            I loaded the hexfile into a arduino uno connected on pixhawk running 3.3.2. Flight modes are shown on MC32 but no other data. As soon as I get a pro mini board, I will start new tests. 

            Do you have experience with new pixhawk firmware versions?

            The APM version was running perfect and delivered all data to the MC32 Display, but I changed all flightcontroll to pixhawk.

            Thanks for all things done. 

            • Thank you for your testing with MC series RC which I don't have.

              I use this with my pixhawk's latest FW with no problems.

              Newer version will use better-written 1-wire serial port, but it's not ready yet.

              Will be glad to hear form you.

              • Maybe I found my issue while try to get this code running:

                • My mistake was to use the minimosd connector to supply the arduino board with mavlink data. Minimosd is connected to telem2 - didn´t doublecheck if it worked after the last updates.
                • While debugging the code, I found heatbeat and flightmode but no other. 
                • Then found this description: 
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