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output nmea sentences for wind speed and direction.

netarar Mar 8, 2023 03:59 AM

Hi... im trying to convert the aparent wind speed and direction from a cr300 into nmea somehow. I'm thinking of building a python app but I wanna make sure that there's no a easier way. It's to feed a navigation radar with this info to calculate the real wind speed and dir while sailing.

Thank you.


pokeeffe Mar 10, 2023 04:46 PM

netarar Mar 11, 2023 02:39 PM

Ohhh... thank you... that sentece outputs strings made with the data i want right??

Edit: I saw the link... thank you so much. Ill try to work with that.

JDavis Mar 14, 2023 10:05 PM

You will need to calculate a checksum to append to the end of the string before output. The other equipment will probably reject the string without the checksum.

pokeeffe Mar 15, 2023 04:19 PM

That's true, it might be okay but you're better off calculating a real checksum. There's lots of good resources online for NMEA checksums. 

Build the data part of the message with `sprintf`, calculate the checksum (for-loop + xor) and format that into hexadecimal with `sprintf`, then insert the data msg and checksum into the nmea message delimiters with `sprintf`. 

sprintf my beloved

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