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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: GPS: (GPS2) Required Libraries: NewSoftSerial - 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. Jay Sissom */ #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( 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 ="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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