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 7:db9226b9b037, committed 2012-10-09

Comitter:
SamClarke
Date:
Tue Oct 09 06:20:57 2012 +0000
Parent:
6:32c25fb48fd2
Child:
8:d4773b6449c5
Commit message:
Returns Tracking information to sender instead of a hard coded number.; Ability to receive a 4 character message (use for software triggers)

Changed in this revision

main.cpp Show annotated file Show diff for this revision Revisions of this file 
--- a/main.cpp	Mon Oct 08 06:34:31 2012 +0000
+++ b/main.cpp	Tue Oct 09 06:20:57 2012 +0000
@@ -10,8 +10,11 @@
 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;
 
 GPS gps(p9,p10);
@@ -47,7 +50,7 @@
     GPRS.printf("AT+CMGF=1\r\n");
     wait(1);
     // Set the phone number
-    GPRS.printf("AT+CMGS=\"+614<<NUMBER>>\"\r\n");
+    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);
@@ -57,7 +60,7 @@
     wait(3);
     GPRS.printf("AT+CMGF=1\r\n");
     wait(1);
-    GPRS.printf("AT+CMGS=\"+614<<NUMBER>>\"\r\n");
+    GPRS.printf("AT+CMGS=\"+%s\"\r\n", NUMBER);
     wait(1);
     GPRS.printf("Find me at....\n %s%f,%f%s", GoogleChunk, gps.latitude, gps.longitude, GoogleExtras);
     wait(1);
@@ -79,27 +82,43 @@
         i++;
     }
     // Uncomment the following to debug
-
-    pc.printf("buffer = %s", GPRSbuffer);
-
+    //pc.printf("\nbuffer = %s", GPRSbuffer);
 
     // If we get an SMS notification....
     if (sscanf(GPRSbuffer, "$$+CMTI: \"SM\",%d", &index)>0) {
+        i=0;
         pc.printf("\nSMS recieved @ index [%d]", index);
-        // Do the send SMS routine...
+        memset(GPRSbuffer, '0', 512);
+        i = 0;
+        GPRS.printf("AT+CMGR=%d\r\n", index);
+        wait(1);
+    }
+
+    if (strncmp(GPRSbuffer, "$$+CMGR",7) == 0 ) {
+    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 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();
+        //wait(4);
         // Reset the GPRS buffer
         memset(GPRSbuffer, '0', 512);
         // Reset the char counter
         i = 0;
-    } 
-   if (strncmp(GPRSbuffer, "$$RING",6) == 0) {
-        //dump = "fixed";
-        GPRS.printf("ATH0\r\n");
+    }
+
+    if (strncmp(GPRSbuffer, "$$+CMGS",7) == 0) {
+        // Reset the GPRS buffer
+        memset(GPRSbuffer, '0', 512);
+        // Reset the char counter
+        i = 0;
+    }
+
+    if (strncmp(GPRSbuffer, "$$RING",6) == 0) {
+    //dump = "fixed";
+    GPRS.printf("ATH0\r\n");
         wait(1);
         // Flush any incoming rings in the MODSERIAL buffer
         GPRS.rxBufferFlush();
@@ -107,21 +126,22 @@
         // 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);
+        //wait(4);
         // Flush out any left in the serial buffer
         GPRS.rxBufferFlush();
         // Reset the GPRS buffer
         memset(GPRSbuffer, '0', 512);
         // Reset the char counter
         i = 0;
-    } else {
-        GPRS.rxBufferFlush();
-        // Reset the GPRS buffer
-        memset(GPRSbuffer, '0', 512);
-        // Reset the char counter
-        i = 0;
-        pc.printf("\nWaiting for SMS or call...\n");
     }
+
+    // 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()