Gravity GNSS positioning system V1.0 not working correctly!

Hi, What is RGB On used for? thanks

Hi Jenna,

Below is the example code from the DFrobot GNSS library ‘getGNSS’

[code]/*! * @file  getGNSS.ino * @brief Get gnss simple data * @copyright Copyright (c) 2010 DFRobot Co.Ltd (http://www.dfrobot.com) * @license The MIT License (MIT) * @author ZhixinLiu([email protected]) * @version V1.0 * @date 2023-03-07 * @url https://github.com/dfrobot/DFRobot_GNSS */

#include "DFRobot_GNSS.h"

#define I2C_COMMUNICATION  //use I2C for communication, but use the serial port for communication if the line of codes were masked

#ifdef  I2C_COMMUNICATION DFRobot_GNSS_I2C gnss(&Wire ,GNSS_DEVICE_ADDR);#else/* ---------------------------------------------------------------------------------------------------------------------*    board   |             MCU                | Leonardo/Mega2560/M0 |    UNO    | ESP8266 | ESP32 |  microbit  |   m0  |*     VCC    |            3.3V/5V             |        VCC           |    VCC    |   VCC   |  VCC  |     X      |  vcc  |*     GND    |              GND               |        GND           |    GND    |   GND   |  GND  |     X      |  gnd  |*     RX     |              TX                |     Serial1 TX1      |     5     |   5/D6  |  D2   |     X      |  tx1  |*     TX     |              RX                |     Serial1 RX1      |     4     |   4/D7  |  D3   |     X      |  rx1  |* ----------------------------------------------------------------------------------------------------------------------*//* Baud rate cannot be changed */ #if defined(ARDUINO_AVR_UNO) || defined(ESP8266)   SoftwareSerial mySerial(4, 5);   DFRobot_GNSS_UART gnss(&mySerial ,9600); #elif defined(ESP32)   DFRobot_GNSS_UART gnss(&Serial1 ,9600 ,/*rx*/D2 ,/*tx*/D3); #else   DFRobot_GNSS_UART gnss(&Serial1 ,9600); #endif#endif

void setup(){ Serial.begin(115200); while(!gnss.begin()){   Serial.println("NO Deivces !");   delay(1000); }

 gnss.enablePower();      // Enable gnss power

/** Set GNSS to be used *   eGPS              use gps*   eBeiDou           use beidou*   eGPS_BeiDou       use gps + beidou*   eGLONASS          use glonass*   eGPS_GLONASS      use gps + glonass*   eBeiDou_GLONASS   use beidou +glonass*   eGPS_BeiDou_GLONASS use gps + beidou + glonass*/ gnss.setGnss(eGPS_BeiDou_GLONASS);

 // gnss.setRgbOff(); gnss.setRgbOn(); // gnss.disablePower();      // Disable GNSS, the data will not be refreshed after disabling  }

void loop(){ sTim_t utc = gnss.getUTC(); sTim_t date = gnss.getDate(); sLonLat_t lat = gnss.getLat(); sLonLat_t lon = gnss.getLon(); double high = gnss.getAlt(); uint8_t starUserd = gnss.getNumSatUsed(); double sog = gnss.getSog(); double cog = gnss.getCog();

 Serial.println(""); Serial.print(date.year); Serial.print("/"); Serial.print(date.month); Serial.print("/"); Serial.print(date.date); Serial.print("/"); Serial.print(utc.hour); Serial.print(":"); Serial.print(utc.minute); Serial.print(":"); Serial.print(utc.second); Serial.println(); Serial.print("latitude Direction  "); Serial.println((char)lat.latDirection); Serial.print("longitude Direction  "); Serial.println((char)lon.lonDirection);  // Serial.print("lat DDMM.MMMMM = "); // Serial.println(lat.latitude, 5); // Serial.print(" lon DDDMM.MMMMM = "); // Serial.println(lon.lonitude, 5); Serial.print("lat degree = "); Serial.println(lat.latitudeDegree,6); Serial.print("lon degree = "); Serial.println(lon.lonitudeDegree,6);

 Serial.print("star userd = "); Serial.println(starUserd); Serial.print("alt high = "); Serial.println(high); Serial.print("sog =  "); Serial.println(sog); Serial.print("cog = "); Serial.println(cog); Serial.print("gnss mode =  "); Serial.println(gnss.getGnssMode()); delay(30000);}[/code]

The two Serial.print statements in bold have been added to make the output more readable.

Below is the output.

London UK is 51.5072° N, 0.1276° W 

I am 120Miles NW of London so I cant be 2.24 degrees N i.e. 2.24 degrees above the equator!!

Either the library is in error or the device is.

Hi!

1.setRgbOn( )

2.Course over ground

The course over ground of the GNSS module is the angle corresponding to the direction of an object, starting from a reference direction (usually true north or magnetic north) and moving clockwise. The heading is expressed in degrees, ranging from 0 to 360.