I'm trying to get GPS coordinates using my SIM808 module by connecting it with Arduino. When I use this code,
#include "SIM900.h"
#include <SoftwareSerial.h>
#include "gps.h"
//To change pins for Software Serial, use the two lines in GSM.cpp.
//GSM Shield for Arduino
//www.open-electronics.org
//this code is based on the example of Arduino Labs.
//Simple sketch to start a connection as client.
GPSGSM gps;
char lon[15];
char lat[15];
char alt[15];
char time[20];
char vel[15];
char msg1[5];
char msg2[5];
char stat;
char inSerial[20];
int i = 0;
boolean started = false;
void setup() {
//Serial connection.
Serial.begin(9600);
Serial.println("GSM Shield testing.");
//Start configuration of shield with baudrate.
//For http uses it is recommended to use 4800 or slower.
if (gsm.begin(2400)) {
Serial.println("\nstatus=READY");
gsm.forceON(); //To ensure that SIM908 is not only in charge mode
started = true;
} else Serial.println("\nstatus=IDLE");
if (started) {
//GPS attach
if (gps.attachGPS())
Serial.println("status=GPSREADY");
else Serial.println("status=ERROR");
delay(20000); //Time for fixing
stat = gps.getStat();
if (stat == 1)
Serial.println("NOT FIXED");
else if (stat == 0)
Serial.println("GPS OFF");
else if (stat == 2)
Serial.println("2D FIXED");
else if (stat == 3)
Serial.println("3D FIXED");
delay(5000);
//Get data from GPS
gps.getPar(lon, lat, alt, time, vel);
Serial.println(lon);
Serial.println(lat);
Serial.println(alt);
Serial.println(time);
Serial.println(vel);
}
};
void loop() {
//Read for new byte on serial hardware, and write them on NewSoftSerial.
serialhwread();
//Read for new byte on NewSoftSerial.
serialswread();
};
void serialhwread() {
i = 0;
if (Serial.available() > 0) {
while (Serial.available() > 0) {
inSerial[i] = (Serial.read());
delay(10);
i++;
}
inSerial[i] = '\0';
if (!strcmp(inSerial, "/END")) {
Serial.println("_");
inSerial[0] = 0x1a;
inSerial[1] = '\0';
gsm.SimpleWriteln(inSerial);
}
//Send a saved AT command using serial port.
if (!strcmp(inSerial, "TEST")) {
stat = gps.getStat();
if (stat == 1)
Serial.println("NOT FIXED");
else if (stat == 0)
Serial.println("GPS OFF");
else if (stat == 2)
Serial.println("2D FIXED");
else if (stat == 3)
Serial.println("3D FIXED");
}
//Read last message saved.
if (!strcmp(inSerial, "MSG")) {
Serial.println(msg1);
} else {
Serial.println(inSerial);
gsm.SimpleWriteln(inSerial);
}
inSerial[0] = '\0';
}
}
void serialswread() {
gsm.SimpleRead();
}
After some time, I get this error on the Serial Monitor of Arduino:
status=ERROR
The connections are as follows:
- TX of Module = Pin 2 of Arduino
- RX of Module = Pin 3 of Arduino
- GND of Module = GND of Arduino
- 5V of Module = 5V of Arduino
The Arduino is powered by USB connected to my PC.