GPS receiver using arduino interface and working

admin says:

Replace the code inside the void loop with below code. Also intialize the int “value” at the begining as ‘0’. Here once the gps is availabe the variable “value” set to ‘1’ and afterwards the if condition always returns false, hence the latitude and longitude can print only once.

if (sgps.available() && value == 0 )
{
  value = 1;
  int c = sgps.read();
  if (gps.encode(c))
  {
    float slat, slon;
    gps.f_get_position(&slat, &slon);
    Serial.print("Latitude :");
    Serial.println(slat, 6);
    Serial.print("Longitude:");
    Serial.println(slon, 6);
  }
}

Rovin Mez says:

This is the complete code to display almost all the available data in the GPS.

#include <SoftwareSerial.h>
#include <TinyGPS.h>

TinyGPS gps;
SoftwareSerial serialgps(4,3);
int year;
byte month, day, hour, minute, second, hundredths;
unsigned long chars;
unsigned short sentences, failed_checksum;

void setup()
{

Serial.begin(9600);
serialgps.begin(9600);
Serial.println("");
Serial.println("GPS Shield QuickStart Example Sketch v12");
Serial.println(" ...waiting for lock... ");
Serial.println("");
}

void loop()
{
while(serialgps.available()) 
{
int c = serialgps.read(); 
if(gps.encode(c)) 
{
float latitude, longitude;
gps.f_get_position(&latitude, &longitude);
Serial.print("Lat/Long: "); 
Serial.print(latitude,6); 
Serial.print(", "); 
Serial.println(longitude,6);
gps.crack_datetime(&year,&month,&day,&hour,&minute,&second,&hundredths);
Serial.print("Date: "); Serial.print(month, DEC); Serial.print("/"); 
Serial.print(day, DEC); Serial.print("/"); Serial.print(year);
Serial.print(" Time: "); Serial.print(hour, DEC); Serial.print(":"); 
Serial.print(minute, DEC); Serial.print(":"); Serial.print(second, DEC); 
Serial.print("."); Serial.println(hundredths, DEC);
Serial.print("Altitude (meters): "); Serial.println(gps.f_altitude()); 
Serial.print("Course (degrees): "); Serial.println(gps.f_course()); 
Serial.print("Speed(kmph): "); Serial.println(gps.f_speed_kmph());
Serial.print("Satellites: "); Serial.println(gps.satellites());
Serial.println();
gps.stats(&chars, &sentences, &failed_checksum);
}
}
}

admin says:

Refer https://mechatrofice.com/arduino/send-gps-location-via-sms; here the condition to send SMS can be replaced with another condition to compare the difference between the known longitude and latitude value (center of the safe zone) with the current GPS values.
The safe zone can be obtained by taking the latitude and longitude values of the center location (home/room/etc..) and the allowed difference from the current value.