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Topic: Problem of getting exact location using DFRobot_sim808.h by GSM808 (Read 45 times) previous topic - next topic

mackert00

Hello ! good day! it seems I can't detect my location through google map. My code gives me latitude and longitude but when I open it, it gives me a wrong location. Can someone help me here ? I use this code because it's easy for me to determine the speed of a vehicle using this but the problem is the accuracy of the location he gives. Currently using GSM808 and Arduino Mega


Here is my code:
#include <DFRobot_sim808.h>
#include <SoftwareSerial.h>
#define MESSAGE_LENGTH 160
char message[MESSAGE_LENGTH];
int messageIndex = 0;
char MESSAGE[300];
char lat[12];
char lon[12];
char wspeed[12];

char phone[16];
char datetime[24];

#define PIN_TX    10
#define PIN_RX    11
#define PHONE_NUMBER "+639096637389"
SoftwareSerial mySerial(PIN_TX,PIN_RX);
DFRobot_SIM808 sim808(&mySerial);//Connect RX,TX,PWR,

void setup()
{
  mySerial.begin(9600);
  Serial.begin(9600);

  //******** Initialize sim808 module *************
  while(!sim808.init())
  {
      Serial.print("Sim808 init error\r\n");
      delay(1000);
  }
  delay(3000);

  if( sim808.attachGPS())
      Serial.println("Open the GPS power success");
  else
      Serial.println("Open the GPS power failure");
}

void loop()
{
  //*********** Detecting unread SMS ************************
   messageIndex = sim808.isSMSunread();

   //*********** At least, there is one UNREAD SMS ***********
   if (messageIndex > 0)
   {             
      //***********In order not to full SIM Memory, is better to delete it**********
      sim808.deleteSMS(messageIndex);
      Serial.print("From number: ");
      Serial.println(phone); 
      Serial.print("Datetime: ");
      Serial.println(datetime);       
      Serial.print("Recieved Message: ");
      Serial.println(message);

    while(!sim808.getGPS())
    {
     
    }

   
      Serial.print(sim808.GPSdata.year);
      Serial.print("/");
      Serial.print(sim808.GPSdata.month);
      Serial.print("/");
      Serial.print(sim808.GPSdata.day);
      Serial.print(" ");
      Serial.print(sim808.GPSdata.hour);
      Serial.print(":");
      Serial.print(sim808.GPSdata.minute);
      Serial.print(":");
      Serial.print(sim808.GPSdata.second);
      Serial.print(":");
      Serial.println(sim808.GPSdata.centisecond);
      Serial.print("latitude :");
      Serial.println(sim808.GPSdata.lat);
      Serial.print("longitude :");
      Serial.println(sim808.GPSdata.lon);
      Serial.print("speed_kph :");
      Serial.println(sim808.GPSdata.speed_kph);
      Serial.print("heading :");
      Serial.println(sim808.GPSdata.heading);
      Serial.println();
 
      float la = sim808.GPSdata.lat;
      float lo = sim808.GPSdata.lon;
      float ws = sim808.GPSdata.speed_kph;
 
      dtostrf(la, 6, 2, lat); //put float value of la into char array of lat. 6 = number of digits before decimal sign. 2 = number of digits after the decimal sign.
      dtostrf(lo, 6, 2, lon); //put float value of lo into char array of lon
      dtostrf(ws, 6, 2, wspeed);  //put float value of ws into char array of wspeed
   
      sprintf(MESSAGE, "Latitude : %s\nLongitude : %s\nSpeed in kph : %s kph\nEMERGENCY !! Track my location here: \nhttp://maps.google.com/maps?q=%s,%s\n", lat, lon, wspeed, lat, lon);
     
       Serial.println("Sim808 init success");
       Serial.println("Start to send message ...");
       Serial.println(MESSAGE);
       Serial.println(phone);
       sim808.sendSMS(phone,MESSAGE);
      //************* Turn off the GPS power ************
      sim808.detachGPS();
     
   }
}


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