Sam Clarke / Mbed 2 deprecated GPS-GPRS_Tracker

An SMS based GPS tracker using the Adafruit Ultimate GPS module http://www.adafruit.com/products/746 and the Seeed Studio GPRS shield (Sim900 chipset) http://www.seeedstudio.com/depot/gprs-shield-p-779.html?cPath=132_134

Dependencies:   GPS MODSERIAL mbed-rtos mbed

SMS based GPS tracker

This is an SMS based GPS tracker using using the Adafruit Ultimate GPS module and the Seeed studio GPRS arduino shield [SIM900 chipset]. The idea of this project is to leverage the free SMS between Virgin mobile prepaid SIM cards in Australia for long distance communication.

Currently the GPRS shield is switched on manually, and should be done about 10 seconds before powering the mbed/GPS in order to disable echo properly during start up. This could easily be fixed by switching the GPRS shield with the mbed at start up, waiting the 10 seconds, set the echo then flush the buffer.

The mbed can read all 160 ASCII chars sent in a message for control.

http://i47.tinypic.com/35alpue.png http://i48.tinypic.com/2mi3y0z.png http://i45.tinypic.com/jkeyvt.png

The Seeed GPRS shield http://www.seeedstudio.com/depot/gprs-shield-p-779.html?cPath=132_134

The Adafruit Ultimate GPS http://www.adafruit.com/products/746

Files at this revision

API Documentation at this revision

Revision 9:bec6e8f731f2, committed 2012-10-09

Comitter:
SamClarke
Date:
Tue Oct 09 18:48:48 2012 +0000
Parent:
8:d4773b6449c5
Child:
10:059cde049cd6
Commit message:
cleaned up :)

Changed in this revision

GPS.lib Show annotated file Show diff for this revision Revisions of this file
main.cpp Show annotated file Show diff for this revision Revisions of this file 
--- a/GPS.lib	Tue Oct 09 06:37:57 2012 +0000
+++ b/GPS.lib	Tue Oct 09 18:48:48 2012 +0000
@@ -1,1 +1,1 @@
-http://mbed.org/users/SamClarke/code/GPS/#697a7215cc10
+http://mbed.org/users/SamClarke/code/GPS/#0a034c2dbea6

--- a/main.cpp	Tue Oct 09 06:37:57 2012 +0000
+++ b/main.cpp	Tue Oct 09 18:48:48 2012 +0000
@@ -3,16 +3,14 @@
 #include "rtos.h"
 #include "MODSERIAL.h"
 #include <string>
-#include <iostream>
 
 using namespace std;
 
-const string GoogleChunk = "http://maps.google.com/maps?q=";
+const string GoogleChunk = "https://maps.google.com.au/maps?q=";
 const string GoogleExtras = "&z=20";
 char GPRSbuffer[512];
 char NUMBER[11];
 char MESSAGE[5];
-string dump;
 int index;
 long int number;
 int i = 0;
@@ -53,7 +51,13 @@
     GPRS.printf("AT+CMGS=\"+%s\"\r\n", NUMBER);
     wait(1);
     // Write out the GPS data in a message
-    GPRS.printf("Time: %4.2f \nAltitude: %3.2fm\nSpeed: %3.2f Kn\nHeading: %3.2f Deg\nValidity: %c\nFix: %s\nSatellites: %d", gps.time, gps.altitude, gps.speed, gps.heading,gps.validity,gps.fixtype,gps.satellites);
+    GPRS.printf("Time: %4.2f \nAltitude: %3.2fm\nSpeed: %3.2f Kn\nHeading: %3.2f Deg\nValidity: %c\nSatellites: %d\nFix code: %d \nFix: ", gps.time, gps.altitude, gps.speed, gps.heading, gps.validity, gps.satellites, gps.fixtype);
+    if(gps.fixtype == 1) {
+        GPRS.printf("Positive");
+    }
+    if(gps.fixtype == 2) {
+        GPRS.printf("Differential");
+    }
     wait(1);
     // Send it...
     GPRS.putc(0x1A);
@@ -82,11 +86,10 @@
         i++;
     }
     // Uncomment the following to debug
-    //pc.printf("\nbuffer = %s", GPRSbuffer);
+    pc.printf("\nbuffer = %s", GPRSbuffer);
 
     // If we get an SMS notification....
     if (sscanf(GPRSbuffer, "$$+CMTI: \"SM\",%d", &index)>0) {
-        i=0;
         pc.printf("\nSMS recieved @ index [%d]", index);
         memset(GPRSbuffer, '0', 512);
         i = 0;
@@ -95,14 +98,13 @@
     }
 
     if (strncmp(GPRSbuffer, "$$+CMGR",7) == 0 ) {
-    for (int k = 24; k < 35; k++) {
+        for (int k = 24; k < 35; k++) {
             NUMBER[k-24] = GPRSbuffer[k];
         }
         for (int k = 64; k < 68; k++) {
             MESSAGE[k-64] = GPRSbuffer[k];
         }
         sendSms();
-        //wait(4);
         // Reset the GPRS buffer
         memset(GPRSbuffer, '0', 512);
         // Reset the char counter
@@ -117,16 +119,12 @@
     }
 
     if (strncmp(GPRSbuffer, "$$RING",6) == 0) {
-    //dump = "fixed";
-    GPRS.printf("ATH0\r\n");
-        wait(1);
+        GPRS.printf("ATH0\r\n");
         // Flush any incoming rings in the MODSERIAL buffer
         GPRS.rxBufferFlush();
         pc.printf("\nCall recieved");
         // Do the send SMS routine...
         sendSms();
-        // Wait for the cascade of [\r\nOK\r\n][\r\nOK\r\n]'s from the SMS's to finish
-        //wait(4);
         // Flush out any left in the serial buffer
         GPRS.rxBufferFlush();
         // Reset the GPRS buffer
@@ -134,14 +132,13 @@
         // Reset the char counter
         i = 0;
     }
-
+    pc.printf("\nWaiting for SMS or call...\n");
+    pc.printf("\nThe last number was :+%s", NUMBER);
+    pc.printf("\nThe last message was :%s", MESSAGE);
     // Reset the GPRS buffer
     memset(GPRSbuffer, '0', 512);
     // Reset the char counter
     i = 0;
-    pc.printf("\nWaiting for SMS or call...\n");
-    pc.printf("\nThe last number was :+%s", NUMBER);
-    pc.printf("\nThe last message was :%s", MESSAGE);
 }
 
 int main()
@@ -150,17 +147,17 @@
     GPRS.baud(19200);
     Thread thread(led_thread);
     memset(GPRSbuffer, '0', 512);
-    pc.printf("I'm Alive...\n");
+    pc.printf("\nI'm Alive...\n");
     // Setup the GPS
     gps.Init();
     // Set the GPRS AT echo off
     GPRS.printf("ATE0\r\n");
-    pc.printf("GPRS Echo OFF\n");
+    pc.printf("\nGPRS echo [OFF]\n");
     wait(1);
     // Delete all messages on the sim card
     GPRS.printf("AT+CMGDA=\"DEL ALL\"\r\n");
     wait(1);
-    pc.printf("Messages Cleared...\n");
+    pc.printf("\nMessages Cleared...\n");
     wait(1);
     // Flush out any \r\nOK\r\n's
     GPRS.rxBufferFlush();