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Arduino Forum How to read a NMEA gps data and prase mannually ?
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  • Replies 2 replies
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  • esp32
  • nmea
  • gps
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Related

How to read a NMEA gps data and prase mannually ?

subhadipghouri
subhadipghouri over 4 years ago

Hey guys, I am working with ESP32 Arduino with a GPS module. I have used the TinyGPS PLUS library to praise NMEA data. But if I want to manually o the job like- String operation by reading the Serial Data, how do I do that?

GPS modules send data by serial communication. I can read the data by a simple Serial Read loop but can't store data the everytime the GPS module send the data.

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  • amgalbu
    amgalbu over 4 years ago +2
    Hello I am not sure what you mean when you say " can't store data the everytime the GPS module send the data." Can't you just declare a global variable String nmeaSentence and then, in the loop(), while…
  • dougw
    dougw over 4 years ago +1
    I'm not quite sure what the question is. There are many explanations of the NMEA format out there such as: https://www.trimble.com/OEM_ReceiverHelp/V4.44/en/NMEA-0183messages_MessageOverview.html https…
  • amgalbu
    amgalbu over 4 years ago

    Hello

    I am not sure what you mean when you say "can't store data the everytime the GPS module send the data."

    Can't you just declare a global variable

    String nmeaSentence

    and then, in the loop(),

     

    while (Serial.available())

    nmeaSentence.concat(Serial.Read());

     

    When you receive a CR or LF (0x13 or 0x10) the sentence is complete and you can parse

     

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  • dougw
    dougw over 4 years ago

    I'm not quite sure what the question is.

    There are many explanations of the NMEA format out there such as:

    https://www.trimble.com/OEM_ReceiverHelp/V4.44/en/NMEA-0183messages_MessageOverview.html

    https://www.sparkfun.com/datasheets/GPS/NMEA%20Reference%20Manual-Rev2.1-Dec07.pdf

    https://www.gpsworld.com/what-exactly-is-gps-nmea-data/#:~:text=Today%20in%20the%20world%20of,and%20match%20hardware%20a…

     

    There is a lot of source code showing how to parse it such as:

    https://github.com/Glinnes/NMEAParser

    https://github.com/Knio/pynmea2

     

    Are you asking how to store data after it is parsed?

    Where do you want to store the data?

    What do you want to do with the data?

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