Just read all 19 pages....

Hi Michael, my hangar mate is at the airfield double checking his connections. 

Hello, first I introduce myself since it is my first intervention in this forum. My name is Pedro, I am from Spain, I have an ultralight plane and I like to fly and program my own instruments for my plane.

I am building the Bluetooth adapter to be able to send the autopilot information from Skydemon to an old TRUTRAK DIGIFLIGHT II autopilot but it is not capable of recognizing the NMEA sentences that the Skydemon sends it.

I have been analyzing the NMEA sentences that the Garmin GPSMAP 296 GPS sends and they are like this:

$GPRMC,111231,A,4041.3941,N,00036.84755,W,0.0,227.3,190225,0.8,W,D*11
$GPRMB,A,0.00,R,,EDNT,4859.7560,N,01053.0926,E,656.923,44.7,,V,D*41
$GPRMC,111232,A,4041.3941,N,00036.84755,W,0.0,227.3,190225,0.8,W,D*12
$GPRMB,A,0.00,R,,EDNT,4859.7560,N,01053.0926,E,656.923,44.7,,V,D*41
$GPRMC,111233,A,4041.3941,N,00036.84755,W,0.0,227.3,190225,0.8,W,D*13
$GPRMB,A,0.00,R,,EDNT,4859.7560,N,01053.0926,E,656.923,44.7,,V,D*41

However, the NMEA sentences that Skydemon currently throws are like this:

$GPRMC,111343,A,41$GPRMB,A,0.76,R,OR$GPRMC,111344,A,41$GPRMB,A,0.76,R,OR$GPRMC,111345,A,41$GPRMB,A,0.76,R,OR$GPRMC,111346,A,41$GPRMB,A,0.76,R,OR$GPRMC,111347,A,41$GPRMB,A,0.76,R,OR$GPRMC,111348,A,41$GPRMB,A,0.76,R,OR$GPRMC,111349,A,41$GPRMB,A,0.76,R,OR$GPRMC,111350,A,41$GPRMB,A,0.76,R,OR$GPRMC,111351,A,41$GPRMB,A,0.76,R,OR$GPRMC,111352,A,41$GPRMB,A,0.76,R,OR$GPRMC,111353,A,41$GPRMB,A,0.76,R,OR$GPRMC,111354,A,41$GPRMB,A,0.76,R,OR

That is, the NMEA frames of the Skydemon are missing all the information fields and also do not end with CR+LF (0x0D + 0x0A) so the TRUTRAK autopilot is not able to interpret the NMEA sentences correctly.

Could you please check and correct it.

PD.-
Thank you very much Tim for having implemented the new Bluetooth functions, it is something that has been needed for a long time to be able to use Skydemon as the main route planning source.

SkyDemon certainly does terminate NMEA sentences with CR-LF. Otherwise, they wouldn't work!

Hello Tim, the transmission is at 9600, and analyzing the radio channel change frames, they do come out with CR+LF as you can see in the image. The only ones that do not come out with CR+LF are the NMEA ones.
The first image is with radio only output, and the second is with radio and autopilot. The third image is a capture of hex data in which it can be seen that the GPS frames do not add CR+LF and the frames is not full data.

A case of very small writing and parallax error was the problem with my hangar mates connection.
D connectors are truly the devils work….
Now fixed and all working fine with the Funke.
We were discussing how we still won’t have the solution to a load of twiddling when cross country in France tho.

I was particularly interested in Pedro’s comments and discussion as I’ve just submitted my paperwork for my Trutrak A/P.
So I’ll watch with interest the resolution. Currently I have an old G195 which happily drives my Trutrak but the SkyD version was my Hope!
I’ll buy the beers Pedro when you get it working if I can blag the resolution of you, and Tim.
Hope to be in Spain in the summer touring about.
Thanks everyone, regards Clive

If anyone is still tinkering I have an unused Irxon BT758 Bluetooth Module with mini gender changer available £7 to include UK postage. Have bought a ready made solution  https://prodimex.co.uk/products/simpleble-for-trig-ty91-and-ty92-radios


Sean Kx
Samsung Galaxy Tab A7 Lite
Android 13
Skydemon latest version always