GPS 06: Waspmote tracker

This example creates a KML file for Google Earth tracking. When the GPS module connects to satellites, Waspmote starts appending data to the KML file. When writing the SD file, the red LED lets the user know that Waspmote shouldn't be switched off.

Required Materials

1 x Waspmote 1 x Battery 1 x GPS module 1 x GPS antenna 1 x SD card

Notes

- Keep in mind that external antennas are not valid for indoor locations. - This example can be executed in Waspmote v12 and Waspmote v15. - The battery has to be connected.

Code

/*
 *  ------ [GPS_06] - Waspmote tracker  --------
 *
 *  Explanation: This example creates a KML file for Google Earth tracking
 *  When GPS module connects to satellites, Waspmtoe starts appending data
 *  to the KML file. When writing the SD file, the red LED lets the user
 *  know that Waspmote shouldn't be switched off.
 *
 *  Copyright (C) 2017 Libelium Comunicaciones Distribuidas S.L.
 *  http://www.libelium.com
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 *  Version:           3.0
 *  Design:            David Gascón
 *  Implementation:    Eduardo Hernando
 */

#include <WaspGPS.h>

// define GPS timeout when connecting to satellites
// this time is defined in seconds (240sec = 4minutes)
#define GPS_TIMEOUT 240

// define status variable for GPS connection
bool status;

// define file name: MUST be 8.3 SHORT FILE NAME
char filename[]="track.kml";

// ending string for KML file
char ENDING[]="";

void setup()
{
  // Open USB port
  USB.ON();
  USB.println(F("Waspmote Tracker"));

  // Set GPS ON  
  GPS.ON();   

  // wait for GPS signal for specific time
  status = GPS.waitForSignal(GPS_TIMEOUT);
  
  if( status == true )
  {    
    USB.println(F("Connected"));
    Utils.blinkLEDs(3000);
  }
  else
  {
    USB.println(F("GPS TIMEOUT. NOT connected"));
  }

  // Set SD ON
  SD.ON(); 

  // Create file
  if(SD.create(filename))
  {
    USB.println(F("file created"));
    SD.appendln(filename,"");
    SD.appendln(filename,"");
    SD.appendln(filename,"");
    SD.appendln(filename,"\t"); 
    SD.appendln(filename,ENDING); 
  }
  else 
  {
    USB.println(F("file NOT created"));  
  } 
}

void loop()
{
  // wait for GPS signal for specific time
  status = GPS.waitForSignal(GPS_TIMEOUT);

  if( status == true )
  {
    USB.println(F("Connected"));

    // getPosition function gets all basic data );
    GPS.getPosition(); 

    // Write log to SD card while Red LED is ON
    Utils.setLED(LED0,LED_ON);
    deleteEnding();
    appendTime();
    appendCoord();   
    SD.appendln(filename,ENDING);     
    Utils.setLED(LED0,LED_OFF);
  }
  else
  {
    USB.println(F("GPS TIMEOUT. NOT connected"));
  }

  delay(1000);
}

/*
 *  deleteEnding - Deletes the last KML file line
 *  in order to write new Data instead of the ending line
 */
void deleteEnding()
{  
  char empty[]="                             ";
  SD.writeSD(filename, empty, SD.getFileSize(filename)-strlen(ENDING)-1);
}

/*
 *  appendTime - append Timestamp to KML file
 */
void appendTime()
{
  char time[100];

  // create timestamp for KML format: yyyy-mm-ddThh:mm:ssZ
  sprintf(time,"20%c%c-%c%c-%c%cT%c%c:%c%c:%c%cZ",  
   GPS.dateGPS[4],
   GPS.dateGPS[5],
   GPS.dateGPS[2],
   GPS.dateGPS[3],
   GPS.dateGPS[0],
   GPS.dateGPS[1],
   GPS.timeGPS[0],
   GPS.timeGPS[1],
   GPS.timeGPS[2],
   GPS.timeGPS[3],
   GPS.timeGPS[4],
   GPS.timeGPS[5]);
  SD.appendln(filename, time);
}

/*
*  appendCoord - appends coordinates and altitude to KML file
 */
void appendCoord()
{

  char coord[100];
  char latitude_str[30];
  char longitude_str[30];

  float latitude=GPS.convert2Degrees(GPS.latitude, GPS.NS_indicator);
  float longitude=GPS.convert2Degrees(GPS.longitude, GPS.EW_indicator);

  Utils.float2String(latitude, latitude_str, 6);
  Utils.float2String(longitude, longitude_str, 6);  

  sprintf(coord,"%s %s %s", longitude_str, latitude_str, GPS.altitude);

  SD.appendln(filename, coord);
}

Output

H#
Waspmote Tracker
Connected
file created
Connected
Connected
Connected
Connected
Connected
...