hi there
iam building a tracking system as my final year project and iam using arduino uno, sparkfun em406 GPS, sim900 v1.4 GPRS, i tried running the GPS and it’s giving me the coordinates and the GPRS shield is connecting to the site through HTTP request but when i combine them together, the GPS don’t generate any data and stuck at the “waiting for lock” message and none of the GPRS outputs appear on the screen
this the code i use, where did i go wrong and what can i do?
#include <cmath>
#include <SoftwareSerial.h>
#include "Arduino.h"
#include <TinyGPS.h>
#define RXPIN 9
#define TXPIN 10
SoftwareSerial mySerial(7, 8);
#define TERMBAUD 19200
#define GPSBAUD 4800
TinyGPS gps;
SoftwareSerial uart_gps(RXPIN, TXPIN);
void getgps(TinyGPS &gps);
void SubmitHttpRequest(long lat, long lng);
void setup()
{
// Sets baud rate of your terminal program
Serial.begin(TERMBAUD);
// Sets baud rate of your GPS
uart_gps.begin(GPSBAUD);
mySerial.println("AT+CSQ");
delay(100);
ShowSerialData();// this code is to show the data from gprs shield, in order to easily see the process of how the gprs shield submit a http request, and the following is for this purpose too.
mySerial.println("AT+CGATT?");
delay(100);
ShowSerialData();
mySerial.println("AT+SAPBR=3,1,\"CONTYPE\",\"GPRS\"");//setting the SAPBR, the connection type is using gprs
delay(1000);
ShowSerialData();
mySerial.println("AT+SAPBR=3,1,\"viva.bh\",\"CMNET\"");//setting the APN, the second need you fill in your local apn server
delay(4000);
ShowSerialData();
mySerial.println("AT+SAPBR=1,1");//setting the SAPBR, for detail you can refer to the AT command mamual
delay(2000);
ShowSerialData();
mySerial.begin(19200); // the GPRS baud rate
Serial.println("");
Serial.println("GPS Shield QuickStart Example Sketch v12");
Serial.println(" ...waiting for lock... ");
Serial.println("");
}
// This is the main loop of the code. All it does is check for data on
// the RX pin of the ardiuno, makes sure the data is valid NMEA sentences,
// then jumps to the getgps() function.
void loop()
{
float lat,lon;
while(uart_gps.available()) // While there is data on the RX pin...
{
int c = uart_gps.read(); // load the data into a variable...
if(gps.encode(c)) // if there is a new valid sentence...
{
getgps(gps,lat,lon); // then grab the data.
Serial.println(lat);
Serial.println(lon);
SubmitHttpRequest(lat, lng)
}
}
}
void SubmitHttpRequest(long lat, long lng)
{
mySerial.println("AT+HTTPINIT"); //init the HTTP request
delay(2000);
ShowSerialData();
mySerial.print("AT+HTTPPARA=\"URL\",\"http://www.mysite.com/data.php");// setting the httppara, the second parameter is the website you want to access
mySerial.print("?lat=");
mySerial.print(lat);
mySerial.print("&lng=");
mySerial.print(lng);
mySerial.println("\"");
delay(1000);
ShowSerialData();
mySerial.println("AT+HTTPACTION=0");//submit the request
delay(10000);//the delay is very important, the delay time is base on the return from the website, if the return datas are very large, the time required longer.
//while(!mySerial.available());
ShowSerialData();
mySerial.println("AT+HTTPREAD");// read the data from the website you access
delay(300);
ShowSerialData();
mySerial.println("");
delay(100);
}
// The getgps function will get and print the values we want.
void getgps(TinyGPS &gps,float &lat2,float &lon2)
{
// To get all of the data into varialbes that you can use in your code,
// all you need to do is define variables and query the object for the
// data. To see the complete list of functions see keywords.txt file in
// the TinyGPS and SoftwareSerial libs.
// Define the variables that will be used
float latitude, longitude;
// Then call this function
gps.f_get_position(&latitude, &longitude);
lat2=latitude;
lon2=longitude;
// You can now print variables latitude and longitude
Serial.print("Lat/Long: ");
Serial.print(latitude,5);
Serial.print(", ");
Serial.println(longitude,5);
// Same goes for date and time
int year;
byte month, day, hour, minute, second, hundredths;
gps.crack_datetime(&year,&month,&day,&hour,&minute,&second,&hundredths);
// Print data and time
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);
//Since month, day, hour, minute, second, and hundr
// Here you can print the altitude and course values directly since
// there is only one value for the function
Serial.print("Altitude (meters): "); Serial.println(gps.f_altitude());
// Same goes for course
Serial.print("Course (degrees): "); Serial.println(gps.f_course());
// And same goes for speed
Serial.print("Speed(kmph): "); Serial.println(gps.f_speed_kmph());
//Serial.println();
// Here you can print statistics on the sentences.
unsigned long chars;
unsigned short sentences, failed_checksum;
gps.stats(&chars, &sentences, &failed_checksum);
//Serial.print("Failed Checksums: ");Serial.print(failed_checksum);
//Serial.println(); Serial.println();
// Here you can print the number of satellites in view
Serial.print("Satellites: ");
Serial.println(gps.satellites());
}
void ShowSerialData()
{
while(gprsSerial.available()!=0)
Serial.write(gprsSerial.read());
}
thanks 