SMS based GPS tracker

Revision 12:3f164c88df87, committed 2012-10-13

Comitter:

SamClarke

Date:

Sat Oct 13 02:09:33 2012 +0000

Parent:

11:fad4b451bec8

Child:

13:d8ee6b45bd0a

Commit message:

Now has the ability to receive 160 chars for control

Changed in this revision

--- a/main.cpp	Fri Oct 12 04:58:17 2012 +0000
+++ b/main.cpp	Sat Oct 13 02:09:33 2012 +0000
@@ -1,3 +1,34 @@
+/******************************************************
+* 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.          *
+*                                                     *
+* NOTE: sendSms() sends the GPS 'extra' data          *
+* (eg. speed, heading etc) in one message, and your   *
+* location as a google maps URL in another message.   *
+* If you are an Iphone user, you can replace the      *
+* "https" in the URL with "http" and remove the ".au" *
+* to get the URL to open in the native maps app.      *
+* however I have found this to be less accurate by    *
+* the fact that it doesn't drop a marker on the       *
+* real locataion, but looks for the nearest address.  *
+* it seems that the internal GPS is the only object   *
+* able to be placed unrestricted on the map.          *
+*                                                     *  
+* October 2012                 Written by: Sam Clarke *
+******************************************************/
+/******************************************************
+* HelloCylon                                          *
+* By Leo Febey Oct 18 2011                            *
+* Displays a looping pattern on the built in LEDs on  *
+* the mbed which looks somewhat like a Cylon eye      *
+* scanner pattern.                                    *
+******************************************************/
+
 #include "mbed.h"
 #include "GPS.h"
 #include "rtos.h"
@@ -6,16 +37,16 @@
 
 using namespace std;
 
-const string GoogleChunk = "https://maps.google.com.au/maps?q=";
-const string GoogleExtras = "&z=20";
-char GPRSbuffer[513];
-char NUMBER[13];
-char MESSAGE[5];
+const string GoogleChunk = "https://maps.google.com.au/maps?q=";   // URL constant
+const string GoogleExtras = "&z=20";                               // Zoom Level (0-20)
+char GPRSbuffer[512];
+char NUMBER[13];    
+string MESSAGE;
 int index;
 int i = 0;
 
 GPS gps(p9,p10);
-MODSERIAL GPRS(p13,p14);                                      
+MODSERIAL GPRS(p13,p14);
 MODSERIAL pc(USBTX,USBRX);
 
 DigitalOut myled1(LED1);
@@ -23,7 +54,7 @@
 DigitalOut myled3(LED3);
 DigitalOut myled4(LED4);
 
-void led_thread(void const *argument)                         // Some light jazz in a thread
+void led_thread(void const *argument)                                  
 {
     while (true) {
         DigitalOut leds[4] = {myled1, myled2, myled3, myled4};
@@ -50,7 +81,8 @@
     GPRS.printf("AT+CMGS=\"%s\"\r\n", NUMBER);
     wait(1);
     // Write out the GPS data in a message
-    GPRS.printf("UTC Time: %4.2f \nAltitude: %3.2fm\nSpeed: %3.2f Kn\nHeading: %3.2f Deg\nGPS data grade: [%c]\nSatellites in use: [%d]\nSatFix code: [%d] \nFix type: ", gps.time, gps.altitude, gps.speed, gps.heading, gps.validity, gps.satellites, gps.fixtype);
+    GPRS.printf("UTC Time: %4.2f \nAltitude: %3.2fm\nSpeed: %3.2f Kn\nHeading: %3.2f Deg\nGPS data grade: [%c]\nSatellites in use: [%d]\nSatFix code: [%d] \nFix type: ",
+                gps.time, gps.altitude, gps.speed, gps.heading, gps.validity, gps.satellites, gps.fixtype);
     if(gps.fixtype == 1) {
         GPRS.printf("Positive");
     }
@@ -90,10 +122,11 @@
     // If we get an SMS notification....
     if (sscanf(GPRSbuffer, "$$+CMTI: \"SM\",%d", &index)>0) {
         pc.printf("\nSMS recieved @ index [%d]", index);
-        memset(GPRSbuffer, '0', 512);
+        memset(GPRSbuffer, '0', 511);
         i = 0;
+        pc.printf("\nOpening message...");
+        // ask GPRS to read the message
         GPRS.printf("AT+CMGR=%d\r\n", index);
-        //wait(1);
     }
 
     if (strncmp(GPRSbuffer, "$$+CMGR",7) == 0 ) {
@@ -101,30 +134,33 @@
         char *n = strstr(GPRSbuffer,"+6");
         strncpy(NUMBER, n, 12);
         // Get the message out
-        char *m = strstr(GPRSbuffer,"\"$$")+3;     
-        strncpy(MESSAGE, m, 4);
+        char * pch;
+        pch = strtok (GPRSbuffer, "$$");
+        pch = strtok (NULL, "$$");
+        MESSAGE = pch;
+        pc.printf("\nDone! ");
         // Send the location
         sendSms();
         // Reset the GPRS buffer
-        memset(GPRSbuffer, '0', 512);
+        memset(GPRSbuffer, '0', 511);
         // Reset the char counter
         i = 0;
     }
 
     if (strncmp(GPRSbuffer, "$$+CMGS",7) == 0) {
         // Reset the GPRS buffer
-        memset(GPRSbuffer, '0', 512);
+        memset(GPRSbuffer, '0', 511);
         // Reset the char counter
         i = 0;
     }
 
     if (strncmp(GPRSbuffer, "$$RING",6) == 0) {
         GPRS.printf("ATH0\r\n");
-        pc.printf("\nCall recieved");
+        pc.printf("\nCall bounced!...");
         // Do the send SMS routine...
         sendSms();
         // Reset the GPRS buffer
-        memset(GPRSbuffer, '0', 512);
+        memset(GPRSbuffer, '0', 511);
         // Reset the char counter
         i = 0;
     }
@@ -132,7 +168,7 @@
     pc.printf("\nThe last number was : %s", NUMBER);
     pc.printf("\nThe last message was : %s", MESSAGE);
     // Reset the GPRS buffer
-    memset(GPRSbuffer, '0', 512);
+    memset(GPRSbuffer, '0', 511);
     // Reset the char counter
     i = 0;
 }
@@ -142,7 +178,7 @@
     pc.baud(115200);
     GPRS.baud(19200);
     Thread thread(led_thread);
-    memset(GPRSbuffer, '0', 512);
+    memset(GPRSbuffer, '0', 511);
     pc.printf("\nI'm Alive...\n");
     // Setup the GPS
     gps.Init();