Hello,
I'm trying to get my SIM900 GPRS to work with my shielded EM 406a !!. I've tried attaching both gps shield and gprs shields on top of each other on top of my arduino uno and it keeps outputting welcome, they're working separately, but not together !. Is the hardware connection connected correctly ??. And, what software modifications do you guys suggest ?!!. Any help would be greatly appreciated. .
// In order for this sketch to work, you will need to download
// TinyGPS and SoftwareSerial library from arduiniana.org and put them
// into the libraries folder in your ardiuno directory.
#include <SoftwareSerial.h>
#include "Arduino.h"
#include <TinyGPS.h>
#include <SoftwareSerial.h>
// Define which pins you will use on the Arduino to communicate with your
// GPS. In this case, the GPS module's TX pin will connect to the
// Arduino's RXPIN which is pin 3.
#define RXPIN 2
#define TXPIN 3
SoftwareSerial mySerial(7, 8);
// This is the serial rate for your terminal program. It must be this
// fast because we need to print everything before a new sentence
// comes in. If you slow it down, the messages might not be valid and
// you will likely get checksum errors.
// Set this value equal to the baud rate of your terminal program
#define TERMBAUD 115200
// Set this value equal to the baud rate of your GPS
#define GPSBAUD 4800
// Create an instance of the TinyGPS object
TinyGPS gps;
// Initialize the SoftwareSerial library to the pins you defined above
SoftwareSerial uart_gps(RXPIN, TXPIN);
// This is where you declare prototypes for the functions that will be
// using the TinyGPS library.
void getgps(TinyGPS &gps);
// In the setup function, you need to initialize two serial ports; the
// standard hardware serial port (Serial()) to communicate with your
// terminal program an another serial port (SoftwareSerial()) for your
// GPS.
void setup()
{
//GPS configuration
// Sets baud rate of your terminal program
Serial.begin(TERMBAUD);
// Sets baud rate of your GPS
uart_gps.begin(GPSBAUD);
Serial.println("");
Serial.println("GPS Shield QuickStart Example Sketch v12");
Serial.println(" ...waiting for lock... ");
Serial.println("");
mySerial.begin(19200);
//GPRS configuration
Serial.println("Config SIM900...");
delay(2000);
Serial.println("Done!...");
mySerial.flush();
Serial.flush();
// attach or detach from GPRS service
mySerial.println("AT+CGATT?");
delay(100);
toSerial();
// bearer settings
mySerial.println("AT+SAPBR=3,1,\"CONTYPE\",\"GPRS\"");
delay(2000);
toSerial();
// bearer settings
mySerial.println("AT+SAPBR=3,1,\"APN\",\"viva.bh\"");
delay(2000);
toSerial();
// bearer settings
mySerial.println("AT+SAPBR=1,1");
delay(2000);
toSerial();
}
// 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()
{
Serial.println("Welcome!...");
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.
if (Serial.available())
switch(Serial.read())
{
case 't':
SendTextMessage(lat,lon);
break;
case 'd':
break;
case 'h':
break;
case 's':
break;
}
}
}
if (mySerial.available())
Serial.write(mySerial.read());
}
void SendTextMessage(float lat, float lon)
{
mySerial.print("AT+CMGF=1\r"); //Because we want to send the SMS in text mode
delay(100);
mySerial.println("AT + CMGS = \"+97333515924\"");//send sms message, be careful need to add a country code before the cellphone number
delay(100);
mySerial.print("lat= ");//the content of the message
mySerial.print(lat);
mySerial.print(" ,lon= ");//the content of the message
mySerial.print(lon);
delay(100);
mySerial.println((char)26);//the ASCII code of the ctrl+z is 26
delay(100);
mySerial.println();
}
// The getgps function will get and print the values we want.
void getgps(TinyGPS &gps, float &kan, float &lon)
{
// 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);
// You can now print variables latitude and longitude
Serial.print("Lat/Long: ");
Serial.print(latitude,5);
Serial.print(", ");
Serial.println(longitude,5);
// 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();
}
void toSerial()
{
while(mySerial.available()!=0)
{
Serial.write(mySerial.read());
}
}