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    Unable to read data from GNSS Module with Core 2

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    • ajb2k3A
      ajb2k3
      last edited by

      Are you trying it inside building or outside as they don't often work inside buildings

      UIFlow, so easy an adult can learn it!
      If I don't know it, be patient!
      I've ether not learned it or am too drunk to remember it!
      Author of the WIP UIFlow Handbook!
      M5Black, Go, Stick, Core2, and so much more it cant be fit in here!

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      • F
        FRA222 @robski
        last edited by

        @robski Thank you very much for your answer. I tried 115200, 57600 and 9600 without any success. I will try tomorrow the other one you gave in your message and will tell you.

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        • F
          FRA222 @ajb2k3
          last edited by

          @ajb2k3 Thank you very much for your help. I did the tests with the external antenna, outside, on the roof close to a window.

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          • F
            FRA222 @FRA222
            last edited by

            @fra222 Thanks a lot again. It is working perfectly now with the 38 400 baudrate. The precision is impressing !

            robskiR 1 Reply Last reply Reply Quote 0
            • robskiR
              robski @FRA222
              last edited by

              @fra222 said in Unable to read data from GNSS Module with Core 2:

              @fra222 Thanks a lot again. It is working perfectly now with the 38 400 baudrate. The precision is impressing !

              good to hear that you have it sorted now @FRA222

              M5StickC, M5StickCPlus, M5StickCplus2,M5GO, M5Core, M5Tough, M5Core2, M5 Demo Board, M5Dial, M5Paper, M5Atom, M5Cardputer, M5StampS3, CoreMP135

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              • U
                UnumDesignum
                last edited by

                Hello,

                I struggle to get GPS data from the GNSS module to the Core2.
                I'm using the demo code here:
                https://github.com/m5stack/M5Module-GNSS/blob/main/examples/getPosition/getPosition.ino
                with the following settings: Serial2.begin(38400, SERIAL_8N1, 13, 14);

                it seems like the Core2 is receiving data from the module, but it doesn't catches any satellite.

                The external antenna is connected and left outside.
                I tried with another Core2 and another GNSS module with same result.

                Any idea ?

                rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
                configsip: 0, SPIWP:0xee
                clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
                mode:DIO, clock div:1
                load:0x3fff0030,len:1344
                load:0x40078000,len:13964
                load:0x40080400,len:3600
                entry 0x400805f0

                Sats HDOP Latitude Longitude Fix Date Time Date Alt Course Speed Card Distance Course Card Chars Sentences Checksum
                (deg) (deg) Age Age (m) --- from GPS ---- ---- to London ---- RX RX Fail

                **** ***** ********** *********** **** ********** ******** **** ****** ****** ***** *** ******** ****** *** 0 0 0
                0 100.0 ********** *********** **** 00/00/2000 00:00:00 951 ****** ****** ***** *** ******** ****** *** 369 0 0
                0 100.0 ********** *********** **** 00/00/2000 00:00:00 952 ****** ****** ***** *** ******** ****** *** 738 0 0
                0 100.0 ********** *********** **** 00/00/2000 00:00:00 953 ****** ****** ***** *** ******** ****** *** 1107 0 0
                ....

                0 100.0 ********** *********** **** 00/00/2000 00:00:00 655 ****** ****** ***** *** ******** ****** *** 25400 0 0
                0 100.0 ********** *********** **** 00/00/2000 00:00:00 656 ****** ****** ***** *** ******** ****** *** 25437 0 0
                0 100.0 ********** *********** **** 00/00/2000 00:00:00 657 ****** ****** ***** *** ******** ****** *** 25474 0 0
                0 100.0 ********** *********** **** 00/00/2000 00:00:00 657 ****** ****** ***** *** ******** ****** *** 25511 0 0

                0_1713188342770_gnss-core2.jpeg

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                • robskiR
                  robski
                  last edited by

                  would it matter if your PPS dip switch isn't set as default?

                  M5StickC, M5StickCPlus, M5StickCplus2,M5GO, M5Core, M5Tough, M5Core2, M5 Demo Board, M5Dial, M5Paper, M5Atom, M5Cardputer, M5StampS3, CoreMP135

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                  • U
                    UnumDesignum @robski
                    last edited by

                    @robski Thank you for your message. I tried to set dip 1 to on but without any success nor changes.
                    (I actually wonder what this PPS is)

                    There are data coming out from Serial2, but it seems that they cannot be decoded by tinyGPS.

                    0x24 0x47 0x4e 0x52 0x4d 0x43 0x2c 0x2c 0x56 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x4e 0x2c 0x56 0x2a 0x33 0x37 0x0d 0x0a 0x24 0x47 0x4e 0x56 0x54 0x47 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x4e 0x2a 0x32 0x45 0x0d 0x0a 0x24 0x47 0x4e 0x47 0x47 0x41 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x30 0x2c 0x30 0x30 0x2c 0x39 0x39 0x2e 0x39 0x39 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2a 0x35 0x36 0x0d 0x0a 0x24 0x47 0x4e 0x47 0x53 0x41 0x2c 0x41 0x2c 0x31 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x39 0x39 0x2e 0x39 0x39 0x2c 0x39 0x39 0x2e 0x39 0x39 0x2c 0x39 0x39 0x2e 0x39 0x39 0x2c 0x31 0x2a 0x33 0x33 0x0d 0x0a 0x24 0x47 0x4e 0x47 0x53 0x41 0x2c 0x41 0x2c 0x31 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x39 0x39 0x2e 0x39 0x39 0x2c 0x39 0x39 0x2e 0x39 0x39 0x2c 0x39 0x39 0x2e 0x39 0x39 0x2c 0x32 0x2a 0x33 0x30 0x0d 0x0a 0x24 0x47 0x4e 0x47 0x53 0x41 0x2c 0x41 0x2c 0x31 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x39 0x39 0x2e 0x39 0x39 0x2c 0x39 0x39 0x2e 0x39 0x39 0x2c 0x39 0x39 0x2e 0x39 0x39 0x2c 0x33 0x2a 0x33 0x31 0x0d 0x0a 0x24 0x47 0x4e 0x47 0x53 0x41 0x2c 0x41 0x2c 0x31 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x39 0x39 0x2e 0x39 0x39 0x2c 0x39 0x39 0x2e 0x39 0x39 0x2c 0x39 0x39 0x2e 0x39 0x39 0x2c 0x34 0x2a 0x33 0x36 0x0d 0x0a 0x24 0x47 0x50 0x47 0x53 0x56 0x2c 0x31 0x2c 0x31 0x2c 0x30 0x30 0x2c 0x31 0x2a 0x36 0x34 0x0d 0x0a 0x24 0x47 0x4c 0x47 0x53 0x56 0x2c 0x31 0x2c 0x31 0x2c 0x30 0x30 0x2c 0x31 0x2a 0x37 0x38 0x0d 0x0a 0x24 0x47 0x41 0x47 0x53 0x56 0x2c 0x31 0x2c 0x31 0x2c 0x30 0x30 0x2c 0x37 0x2a 0x37 0x33 0x0d 0x0a 0x24 0x47 0x42 0x47 0x53 0x56 0x2c 0x31 0x2c 0x31 0x2c 0x30 0x30 0x2c 0x31 0x2a 0x37 0x36 0x0d 0x0a 0x24 0x47 0x4e 0x47 0x4c 0x4c 0x2c 0x2c 0x2c 0x2c 0x2c 0x2c 0x56 0x2c 0x4e 0x2a 0x37 0x41 0x0d 0x0a 0 100.0 ********** *********** **** 00/00/2000 00:00:00 245 ****** ****** ***** *** ******** ****** *** 369 0 0

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                    • U
                      UnumDesignum @UnumDesignum
                      last edited by

                      @unumdesignum The data returned by the GNSS module in ASCII:

                      $GNRMC,,V,,,,,,,,,,N,V37
                      $GNVTG,,,,,,,,,N                      2E
                      $GNGGA,,,,,,0,00,99.99,,,,,,56
                      $GNGSA,A,1,,,,,,,,,,,,,99.99,99.99,99.99,1                      33
                      $GNGSA,A,1,,,,,,,,,,,,,99.99,99.99,99.99,230
                      $GNGSA,A,1,,,,,,,,,,,,,99.99,99.99,99.99,3                      31
                      $GNGSA,A,1,,,,,,,,,,,,,99.99,99.99,99.99,436
                      $GPGSV,1,1,00,1                      64
                      $GLGSV,1,1,00,178
                      $GAGSV,1,1,00,7                      73
                      $GBGSV,1,1,00,176
                      $GNGLL,,,,,,V,N                      7A

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                      • robskiR
                        robski
                        last edited by

                        Have you tried different baudrates?

                        M5StickC, M5StickCPlus, M5StickCplus2,M5GO, M5Core, M5Tough, M5Core2, M5 Demo Board, M5Dial, M5Paper, M5Atom, M5Cardputer, M5StampS3, CoreMP135

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                        • U
                          UnumDesignum @robski
                          last edited by

                          @robski yes I did. At 38400 I have a communication with the GNSS module. At other baud rates, I've got nothing.
                          Issue is not to communicate with the module, it is that the module does not return any valid position.

                          After some researches, my understanding is that I need to find out how to configure the GNSS module to make it work in my location (France). It seems that the actual configuration does not work. I'm learning the uBlox PBX commands as we speak.

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                          • U
                            UnumDesignum
                            last edited by

                            I connected the module to the u-center app to have more information, but nothing helpful here.
                            The GNSS module does not see any satellite (GSV sentences).
                            Is there any GPS expert able to check the configuration ?

                            0_1713299332068_config.jpeg
                            0_1713299346969_log1.jpeg 0_1713299360561_log2.jpeg

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                            • U
                              UnumDesignum
                              last edited by UnumDesignum

                              For information to future readers, this morning one device Core2+GNSS suddenly started to work without any changes. The other one (same hw/sw) is now able to see satellites (between 11 to 14) but is totally unable to get a fix.

                              ~~I wanted to use the magnetic gyroscope (BMM150) as well, but the data seems crazy and I cannot get any heading from them. Moreover, since this morning, the BIM270 initialisation is not more working.

                              So I give up this module and I will use another GPS solution.~~

                              Edit: thanks to M5Stack Support, the GNSS modules work fine now.
                              The magnetic gyroscope BMM150, as other magnetometer requires a proper calibration to be used.

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