Difference between revisions of "SDGPSLogger"

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(New page: The SD GPS logger will take data from a GPS and log it into a file on an SD card every 5 seconds. It is based on the Arduino with an SD card shield and an attached GPS.)
 
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It is based on the Arduino with an SD card shield and an attached GPS.
 
It is based on the Arduino with an SD card shield and an attached GPS.
 +
 +
Here is the source code:
 +
<nowiki>
 +
/*
 +
  SD gps datalogger
 +
 
 +
  This will log locations to a file on an SD card.
 +
 +
  Known bugs:
 +
    If the code writes to the SD card at the same time you power down, it
 +
    can corrupt the file system on the SD card.
 +
 +
  Pins:
 +
    SD MOSI - pin 11
 +
    SD CLK - pin 13
 +
    SD CS - pin 8
 +
    GPS serial out - pin 7
 +
    GPS serial in - pin 6 (not needed)
 +
 +
  SD Shield:
 +
    http://www.sparkfun.com/products/9802
 +
 +
  GPS:
 +
    http://www.byonics.com/tinytrak/gps.php (GPS2)
 +
 +
  Required Libraries:
 +
    NewSoftSerial - http://arduiniana.org/libraries/newsoftserial/
 +
    TinyGPS - http://arduiniana.org/libraries/tinygps/
 +
 +
Copyright (C) 2011 Jay Sissom
 +
 +
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; version 2
 +
of the License.  THIS SOFTWARE IS RELEASED UNDER THE TERMS OF
 +
VERSION 2 OF THE GPL LICENSE ONLY.
 +
 +
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, write to the Free Software
 +
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 +
 +
http://www.gnu.org/licenses/gpl-2.0.html
 +
 +
Jay Sissom jsissom@gmail.com
 +
 +
*/
 +
#include <SD.h>
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#include <NewSoftSerial.h>
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#include <TinyGPS.h>
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 +
// GPS and serial objects
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TinyGPS gps;
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NewSoftSerial nss(7,6,true);
 +
 +
// GPS data (global so we don't need to pass them around)
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long lat, lon;
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int year;
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byte month, day, hour, minute, second, hundredths;
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unsigned long age, date, time, chars, speed;
 +
bool moving = true;
 +
 +
// On the Ethernet Shield, CS is pin 4. Note that even if it's not
 +
// used as the CS pin, the hardware CS pin (10 on most Arduino boards,
 +
// 53 on the Mega) must be left as an output or the SD library
 +
// functions will not work.
 +
const int chipSelect = 8;
 +
 +
void setup() {
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  Serial.begin(9600);
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  Serial.print("Initializing SD card...");
 +
 +
  // make sure that the default chip select pin is set to
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  // output, even if you don't use it:
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  pinMode(10, OUTPUT);
 +
 
 +
  // see if the card is present and can be initialized:
 +
  if (!SD.begin(chipSelect)) {
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    Serial.println("Card failed, or not present");
 +
    // don't do anything more:
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    return;
 +
  }
 +
  Serial.println("card initialized.");
 +
 +
  nss.begin(4800);
 +
 
 +
  Serial.println("GPS initialized.");
 +
}
 +
 +
void loop() {
 +
  bool newdata = false;
 +
  unsigned long start = millis();
 +
 +
  // Every 5 seconds we write an update (if we are moving)
 +
  while (millis() - start < 5000) {
 +
    if ( feedgps() ) {
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      newdata = true;
 +
    }
 +
  }
 +
 +
  if (newdata) {
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    speed = gps.speed();
 +
    gps.get_position(&lat, &lon, &age);
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    feedgps();
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    gps.get_datetime(&date, &time, &age);
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    feedgps();
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    gps.crack_datetime(&year, &month, &day, &hour, &minute, &second, &hundredths, &age);
 +
    feedgps();
 +
 +
    // Only write data if we are moving
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    if ( moving ) {
 +
      writeData();
 +
    }
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    moving = ( speed > 85 );
 +
  } else {
 +
    Serial.println("No GPS data during the last 5 seconds");
 +
  }
 +
}
 +
 +
bool feedgps() {
 +
  while (nss.available()) {
 +
    if (gps.encode(nss.read()))
 +
      return true;
 +
  }
 +
  return false;
 +
}
 +
 +
void writeData() {
 +
  // open the file. note that only one file can be open at a time,
 +
  // so you have to close this one before opening another.
 +
  File dataFile = SD.open("datalog.txt", FILE_WRITE);
 +
 +
  // if the file is available, write to it:
 +
  if (dataFile) {
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    feedgps();
 +
    dataFile.print(lat);
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    dataFile.print("\t");
 +
    dataFile.print(lon);
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    dataFile.print("\t");
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    dataFile.print(gps.altitude());
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    dataFile.print("\t");
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    feedgps();
 +
    dataFile.print(year);
 +
    dataFile.print("\t");
 +
    dataFile.print(static_cast<int>(month));
 +
    dataFile.print("\t");
 +
    dataFile.print(static_cast<int>(day));
 +
    dataFile.print("\t");
 +
    dataFile.print(static_cast<int>(hour));
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    feedgps();
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    dataFile.print("\t");
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    dataFile.print(static_cast<int>(minute));
 +
    dataFile.print("\t");
 +
    dataFile.print(static_cast<int>(second));
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    dataFile.print("\t");
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    dataFile.print(gps.course());
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    dataFile.print("\t");
 +
    dataFile.print(speed);
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    dataFile.print("\t");
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    dataFile.println(age);
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    feedgps();
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    dataFile.close();
 +
  } else {
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    Serial.println("error opening datalog.txt");
 +
  }
 +
 +
  // print to the serial port too:
 +
  feedgps();
 +
  Serial.print(lat);
 +
  Serial.print("\t");
 +
  Serial.print(lon);
 +
  Serial.print("\t");
 +
  Serial.print(gps.altitude());
 +
  Serial.print("\t");
 +
  feedgps();
 +
  Serial.print(year);
 +
  Serial.print("\t");
 +
  Serial.print(static_cast<int>(month));
 +
  Serial.print("\t");
 +
  Serial.print(static_cast<int>(day));
 +
  Serial.print("\t");
 +
  Serial.print(static_cast<int>(hour));
 +
  feedgps();
 +
  Serial.print("\t");
 +
  Serial.print(static_cast<int>(minute));
 +
  Serial.print("\t");
 +
  Serial.print(static_cast<int>(second));
 +
  Serial.print("\t");
 +
  Serial.print(gps.course());
 +
  Serial.print("\t");
 +
  Serial.print(gps.speed());
 +
  Serial.print("\t");
 +
  Serial.println(age);
 +
  feedgps();
 +
}
 +
 +
 +
</nowiki>

Revision as of 07:54, 6 May 2011

The SD GPS logger will take data from a GPS and log it into a file on an SD card every 5 seconds.

It is based on the Arduino with an SD card shield and an attached GPS.

Here is the source code: /* SD gps datalogger This will log locations to a file on an SD card. Known bugs: If the code writes to the SD card at the same time you power down, it can corrupt the file system on the SD card. Pins: SD MOSI - pin 11 SD CLK - pin 13 SD CS - pin 8 GPS serial out - pin 7 GPS serial in - pin 6 (not needed) SD Shield: http://www.sparkfun.com/products/9802 GPS: http://www.byonics.com/tinytrak/gps.php (GPS2) Required Libraries: NewSoftSerial - http://arduiniana.org/libraries/newsoftserial/ TinyGPS - http://arduiniana.org/libraries/tinygps/ Copyright (C) 2011 Jay Sissom 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; version 2 of the License. THIS SOFTWARE IS RELEASED UNDER THE TERMS OF VERSION 2 OF THE GPL LICENSE ONLY. 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, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. http://www.gnu.org/licenses/gpl-2.0.html Jay Sissom jsissom@gmail.com */ #include <SD.h> #include <NewSoftSerial.h> #include <TinyGPS.h> // GPS and serial objects TinyGPS gps; NewSoftSerial nss(7,6,true); // GPS data (global so we don't need to pass them around) long lat, lon; int year; byte month, day, hour, minute, second, hundredths; unsigned long age, date, time, chars, speed; bool moving = true; // On the Ethernet Shield, CS is pin 4. Note that even if it's not // used as the CS pin, the hardware CS pin (10 on most Arduino boards, // 53 on the Mega) must be left as an output or the SD library // functions will not work. const int chipSelect = 8; void setup() { Serial.begin(9600); Serial.print("Initializing SD card..."); // make sure that the default chip select pin is set to // output, even if you don't use it: pinMode(10, OUTPUT); // see if the card is present and can be initialized: if (!SD.begin(chipSelect)) { Serial.println("Card failed, or not present"); // don't do anything more: return; } Serial.println("card initialized."); nss.begin(4800); Serial.println("GPS initialized."); } void loop() { bool newdata = false; unsigned long start = millis(); // Every 5 seconds we write an update (if we are moving) while (millis() - start < 5000) { if ( feedgps() ) { newdata = true; } } if (newdata) { speed = gps.speed(); gps.get_position(&lat, &lon, &age); feedgps(); gps.get_datetime(&date, &time, &age); feedgps(); gps.crack_datetime(&year, &month, &day, &hour, &minute, &second, &hundredths, &age); feedgps(); // Only write data if we are moving if ( moving ) { writeData(); } moving = ( speed > 85 ); } else { Serial.println("No GPS data during the last 5 seconds"); } } bool feedgps() { while (nss.available()) { if (gps.encode(nss.read())) return true; } return false; } void writeData() { // open the file. note that only one file can be open at a time, // so you have to close this one before opening another. File dataFile = SD.open("datalog.txt", FILE_WRITE); // if the file is available, write to it: if (dataFile) { feedgps(); dataFile.print(lat); dataFile.print("\t"); dataFile.print(lon); dataFile.print("\t"); dataFile.print(gps.altitude()); dataFile.print("\t"); feedgps(); dataFile.print(year); dataFile.print("\t"); dataFile.print(static_cast<int>(month)); dataFile.print("\t"); dataFile.print(static_cast<int>(day)); dataFile.print("\t"); dataFile.print(static_cast<int>(hour)); feedgps(); dataFile.print("\t"); dataFile.print(static_cast<int>(minute)); dataFile.print("\t"); dataFile.print(static_cast<int>(second)); dataFile.print("\t"); dataFile.print(gps.course()); dataFile.print("\t"); dataFile.print(speed); dataFile.print("\t"); dataFile.println(age); feedgps(); dataFile.close(); } else { Serial.println("error opening datalog.txt"); } // print to the serial port too: feedgps(); Serial.print(lat); Serial.print("\t"); Serial.print(lon); Serial.print("\t"); Serial.print(gps.altitude()); Serial.print("\t"); feedgps(); Serial.print(year); Serial.print("\t"); Serial.print(static_cast<int>(month)); Serial.print("\t"); Serial.print(static_cast<int>(day)); Serial.print("\t"); Serial.print(static_cast<int>(hour)); feedgps(); Serial.print("\t"); Serial.print(static_cast<int>(minute)); Serial.print("\t"); Serial.print(static_cast<int>(second)); Serial.print("\t"); Serial.print(gps.course()); Serial.print("\t"); Serial.print(gps.speed()); Serial.print("\t"); Serial.println(age); feedgps(); }

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