gps neo8n ublox esp32

esp32_ublox_m8n.cpp

gps neo8n ublox esp32
ESP32 + NEO8N with ublox protocal





wiring

ESP32	Ublox Neo M8N
3.3v	VCC
GPIO26	RX
GPIO27	TX
GND	GND


Library :



/******************************************************************************
u-blox_GNSS.h
u-blox GNSS Arduino
Leonardo Bispo
Mar 03, 2019
https://github.com/ldab/u-blox_GNSS

Distributed as-is; no warranty is given.
******************************************************************************/

// Enable Serial debbug on Serial UART to see registers wrote
#define GNSS_DEBUG Serial

#include "ublox_GNSS.h"
#include <SoftwareSerial.h>
SoftwareSerial Serial_GNSS(27, 26); // TX->GPIO 27 , RX->GPIO 26



float lat, lon, acc;

fixType_t fix = NO_FIX;

GNSS gnss( Serial_GNSS );

void setup() {
  // put your setup code here, to run once:
  Serial.begin( 115200 );

  Serial_GNSS.begin( 9600 );

  if( gnss.init(  ) )
  {
    Serial.println("\nGNSS initialized.");
  }
  else
  {
    Serial.println("\nFailed to initialize GNSS module.");
  }

}

void loop()
{
  // Get coordinates with minimum 100m accuracy;
  Serial.println("Get location");

  if ( gnss.getCoodinates(lon, lat, fix, acc, 100) == 0) 
  {
    Serial.println("Failed to get coordinates, check signal, accuracy required or wiring");
  }

  Serial.println("\nHere you are, lon:" + String(lon, 7) +" lat:" + String(lat, 7));
  Serial.println("calculated error: " + String(acc) + "m");
  
  Serial.println("\nOr try the following link to see on google maps:");
  Serial.println(String("https://www.google.com/maps/search/?api=1&query=") + String(lat,7) + "," + String(lon,7));

  delay(1000);

}


Output would be look like

Get location

Here you are, lon:98.3586273 lat:7.8558259
calculated error: 7.13m

Or try the following link to see on google maps:
https://www.google.com/maps/search/?api=1&query=7.8558259,98.3586273






More advanced library



/*
  Reading lat and long via UBX binary commands using UART @38400 baud - free from I2C
  By: Nathan Seidle, Adapted from Example3_GetPosition by Thorsten von Eicken
  SparkFun Electronics
  Date: January 28rd, 2019
  License: MIT. See license file for more information but you can
  basically do whatever you want with this code.

  This example shows how to configure the library and U-Blox for serial port use as well as
  switching the module from the default 9600 baud to 38400.

  Note: Long/lat are large numbers because they are * 10^7. To convert lat/long
  to something google maps understands simply divide the numbers by 10,000,000. We 
  do this so that we don't have to use floating point numbers.

  Leave NMEA parsing behind. Now you can simply ask the module for the datums you want!

  Feel like supporting open source hardware?
  Buy a board from SparkFun!
  ZED-F9P RTK2: https://www.sparkfun.com/products/15136
  NEO-M8P RTK: https://www.sparkfun.com/products/15005
  SAM-M8Q: https://www.sparkfun.com/products/15106

  Hardware Connections:
  Connect the U-Blox serial TX pin to Uno pin 10
  Connect the U-Blox serial RX pin to Uno pin 11
  Open the serial monitor at 115200 baud to see the output
*/

#include "SparkFun_Ublox_Arduino_Library.h" //http://librarymanager/All#SparkFun_u-blox_GNSS
SFE_UBLOX_GPS myGPS;

#include <SoftwareSerial.h>
SoftwareSerial mySerial(27, 26); // TX->GPIO 27 , RX->GPIO 26

long lastTime = 0; //Simple local timer. Limits amount of I2C traffic to Ublox module.

void setup()
{
  Serial.begin(115200);
  while (!Serial); //Wait for user to open terminal
  Serial.println("SparkFun Ublox Example");

  //Assume that the U-Blox GPS is running at 9600 baud (the default) or at 38400 baud.
  //Loop until we're in sync and then ensure it's at 38400 baud.
  do {
    Serial.println("GPS: trying 38400 baud");
    mySerial.begin(38400);
    if (myGPS.begin(mySerial) == true) break;

    delay(100);
    Serial.println("GPS: trying 9600 baud");
    mySerial.begin(9600);
    if (myGPS.begin(mySerial) == true) {
        Serial.println("GPS: connected at 9600 baud, switching to 38400");
        myGPS.setSerialRate(38400);
        delay(100);
    } else {
        //myGPS.factoryReset();
        delay(2000); //Wait a bit before trying again to limit the Serial output
    }
  } while(1);
  Serial.println("GPS serial connected");

  myGPS.setUART1Output(COM_TYPE_UBX); //Set the UART port to output UBX only
  myGPS.setI2COutput(COM_TYPE_UBX); //Set the I2C port to output UBX only (turn off NMEA noise)
  myGPS.saveConfiguration(); //Save the current settings to flash and BBR
}

void loop()
{
  //Query module only every second. Doing it more often will just cause I2C traffic.
  //The module only responds when a new position is available
  if (millis() - lastTime > 1000)
  {
    lastTime = millis(); //Update the timer
    
    long latitude = myGPS.getLatitude();
    Serial.print(F("Lat: "));
    Serial.print(latitude);

    long longitude = myGPS.getLongitude();
    Serial.print(F(" Long: "));
    Serial.print(longitude);
    Serial.print(F(" (degrees * 10^-7)"));

    long altitude = myGPS.getAltitude();
    Serial.print(F(" Alt: "));
    Serial.print(altitude);
    Serial.print(F(" (mm)"));

    byte SIV = myGPS.getSIV();
    Serial.print(F(" SIV: "));
    Serial.print(SIV);

    Serial.println();
  }
}


Output look like สังเกตว่ามีการเปลี่ยน baudrate ในโค้ดจาก 9600 เป็น 38400 ดังนั้นถ้ากลับไปใช้โค้ดด้านบน ให้ใช้ baudrate นี้นะครับ

GPS: trying 9600 baud
GPS: connected at 9600 baud, switching to 38400
GPS: trying 38400 baud
GPS serial connected
Lat: 78558497 Long: 983586128 (degrees * 10^-7) Alt: -19454 (mm) SIV: 14
Lat: 78558507 Long: 983586132 (degrees * 10^-7) Alt: -19597 (mm) SIV: 14
Lat: 78558520 Long: 983586154 (degrees * 10^-7) Alt: -19690 (mm) SIV: 14
Lat: 78558527 Long: 983586150 (degrees * 10^-7) Alt: -19324 (mm) SIV: 14
Lat: 78558535 Long: 983586143 (degrees * 10^-7) Alt: -19100 (mm) SIV: 14