Just read the data from the GPS module and write it t a file on the SD card.
I presume you want to read the SD card by a PC etc at a later date, so you need to use the FAT library to write the file, so it's readable by most computers.
You need to decide what format you want to use for the data in the file.
Probably CSV. Comma separated values. Which can be opened in Spreadsheets etc, is the best way to go, unless you want to open it in some other program which has its own file structure, in which case you'd need to write the data in the required format, or post process it in the PC.
Are you are only writing once per second, I'd Close the file after each write, and open it again before the next write of data.
You should still avoid removing the card when the device is powered up, as it may be in the middle of writing an update.
Also. Depending on how long you are logging for. You may want to use a different file name each hour, I.e otherwise your files will end up having a lot of data in each one, e.g. 3600 lines of data per hour.
I want the SD card to save raw data and 2 battery voltages. And the serial monitor to show less data:
Time:
Date:
Location (Latitude and Longitude):
Speed (knots ore km/h):
Heading:
Altitude (meters):
Satellites:
Accuracy (meters):
Main battery (vdc):
GPS battery (vdc):
I want to use PWM pin 2 and 3 (ore TX1 and RX1) to obtain GPS information and pin 50 to 52 to save data to SD card.
I will also use the analog stick A0 and A1 to retrieve the battery voltage.
After that everything works on my current card I'm going to get myself an Arduino Nano and mobile SIM900 module.
I tryed one of the codes I found on Adafruit but did not get any data to serial monitor.
When I used serial monitoring it stopped at "Adafruit GPS library basic test!"
// Test code for Adafruit GPS modules using MTK3329/MTK3339 driver
//
// This code just echos whatever is coming from the GPS unit to the
// serial monitor, handy for debugging!
//
// Tested and works great with the Adafruit Ultimate GPS module
// using MTK33x9 chipset
// ------> http://www.adafruit.com/products/746
// Pick one up today at the Adafruit electronics shop
// and help support open source hardware & software! -ada
#include <Adafruit_GPS.h>
#if ARDUINO >= 100
#include <SoftwareSerial.h>
#else
// Older Arduino IDE requires NewSoftSerial, download from:
// http://arduiniana.org/libraries/newsoftserial/
// #include <NewSoftSerial.h>
// DO NOT install NewSoftSerial if using Arduino 1.0 or later!
#endif
// Connect the GPS Power pin to 5V
// Connect the GPS Ground pin to ground
// If using software serial (sketch example default):
// Connect the GPS TX (transmit) pin to Digital 3
// Connect the GPS RX (receive) pin to Digital 2
// If using hardware serial (e.g. Arduino Mega):
// Connect the GPS TX (transmit) pin to Arduino RX1, RX2 or RX3
// Connect the GPS RX (receive) pin to matching TX1, TX2 or TX3
// If using software serial, keep these lines enabled
// (you can change the pin numbers to match your wiring):
#if ARDUINO >= 100
SoftwareSerial mySerial(3, 2);
#else
NewSoftSerial mySerial(3, 2);
#endif
Adafruit_GPS GPS(&mySerial);
// If using hardware serial (e.g. Arduino Mega), comment
// out the above six lines and enable this line instead:
//Adafruit_GPS GPS(&Serial1);
// Set GPSECHO to 'false' to turn off echoing the GPS data to the Serial console
// Set to 'true' if you want to debug and listen to the raw GPS sentences
#define GPSECHO true
// this keeps track of whether we're using the interrupt
// off by default!
boolean usingInterrupt = false;
void useInterrupt(boolean); // Func prototype keeps Arduino 0023 happy
void setup()
{
// connect at 115200 so we can read the GPS fast enuf and
// also spit it out
Serial.begin(115200);
Serial.println("Adafruit GPS library basic test!");
// 9600 NMEA is the default baud rate for MTK - some use 4800
GPS.begin(9600);
// You can adjust which sentences to have the module emit, below
// uncomment this line to turn on RMC (recommended minimum) and GGA (fix data) including altitude
GPS.sendCommand(PMTK_SET_NMEA_OUTPUT_RMCGGA);
// uncomment this line to turn on only the "minimum recommended" data for high update rates!
//GPS.sendCommand(PMTK_SET_NMEA_OUTPUT_RMCONLY);
// uncomment this line to turn on all the available data - for 9600 baud you'll want 1 Hz rate
//GPS.sendCommand(PMTK_SET_NMEA_OUTPUT_ALLDATA);
// Set the update rate
// 1 Hz update rate
//GPS.sendCommand(PMTK_SET_NMEA_UPDATE_1HZ);
// 5 Hz update rate- for 9600 baud you'll have to set the output to RMC or RMCGGA only (see above)
GPS.sendCommand(PMTK_SET_NMEA_UPDATE_5HZ);
// 10 Hz update rate - for 9600 baud you'll have to set the output to RMC only (see above)
//GPS.sendCommand(PMTK_SET_NMEA_UPDATE_10HZ);
// Request updates on antenna status, comment out to keep quiet
GPS.sendCommand(PGCMD_ANTENNA);
// the nice thing about this code is you can have a timer0 interrupt go off
// every 1 millisecond, and read data from the GPS for you. that makes the
// loop code a heck of a lot easier!
useInterrupt(true);
delay(1000);
}
// Interrupt is called once a millisecond, looks for any new GPS data, and stores it
SIGNAL(TIMER0_COMPA_vect) {
char c = GPS.read();
// if you want to debug, this is a good time to do it!
if (GPSECHO)
if (c) UDR0 = c;
// writing direct to UDR0 is much much faster than Serial.print
// but only one character can be written at a time.
}
void useInterrupt(boolean v) {
if (v) {
// Timer0 is already used for millis() - we'll just interrupt somewhere
// in the middle and call the "Compare A" function above
OCR0A = 0xAF;
TIMSK0 |= _BV(OCIE0A);
usingInterrupt = true;
} else {
// do not call the interrupt function COMPA anymore
TIMSK0 &= ~_BV(OCIE0A);
usingInterrupt = false;
}
}
void loop() // run over and over again
{
// do nothing! all reading and printing is done in the interrupt
}
What you want to do and what you seem to be able to do are worlds apart. I think you need to change your want list to something more reasonable, for now. Something more like "I want to see data from the GPS".
With a more reasonable set of expectations, you can then show us how the GPS is actually connected to the Arduino, and use some code that simply uses a SoftwareSerial instance to read from the GPS and Serial to write to the PC. Forget the interrupt crap. Forget logging. Forget trying to write code that operates with any version of the IDE.
Was able to find a code that works. Next part is adding logging to sd.
This new code can handle software serial and hardware serial.
#include <Adafruit_GPS.h>
#include <SoftwareSerial.h>
////////////////////Enable software serial below////////////////////
// To use software serial, keep the two lines below enabled
// and the to hardware lines dissabled by using //.
// (you can change the pin numbers to match your wiring):
SoftwareSerial mySerial(11, 10);
Adafruit_GPS GPS(&mySerial);
////////////////////////////////////////////////////////////////////
////////////////////Enable hardware serial below////////////////////
// This code is made for hardware serial like Arduino Mega:
// Connect jumper from GPS TX pad to Arduino RX1, RX2 or RX3
// Connect jumper from GPS RX pad to Arduino TX1, TX2 or TX3
// Make sure you change serial number for your wiring (Serial1,Serial2,Serial3 etc.)
//HardwareSerial mySerial = Serial1;
//Adafruit_GPS GPS(&Serial1);
////////////////////////////////////////////////////////////////////
// Set GPSECHO to 'false' to turn off echoing the GPS data to the Serial console
// Set to 'true' if you want to debug and listen to the raw GPS sentences.
#define GPSECHO false
// this keeps track of whether we're using the interrupt
// off by default!
boolean usingInterrupt = false;
void useInterrupt(boolean); // Func prototype keeps Arduino 0023 happy
/************************ ARDUINO SETUP ***********************
****************************************************************/
void setup()
{
// connect at 115200 so we can read the GPS fast enough and echo without dropping chars
// also spit it out
// make sure your Serial Monitor is set to 115200 to see data visually
Serial.begin(115200);
Serial.println("Adafruit GPS!");
// 9600 NMEA is the default baud rate for Adafruit MTK GPS's- some use 4800
GPS.begin(9600);
// uncomment this line to turn on RMC (recommended minimum) and GGA (fix data) including altitude
GPS.sendCommand(PMTK_SET_NMEA_OUTPUT_RMCGGA);
// uncomment this line to turn on only the "minimum recommended" data
//GPS.sendCommand(PMTK_SET_NMEA_OUTPUT_RMCONLY);
// For parsing data, we don't suggest using anything but either RMC only or RMC+GGA since
// the parser doesn't care about other sentences at this time
// Set the update rate
GPS.sendCommand(PMTK_SET_NMEA_UPDATE_1HZ); // 1 Hz update rate
// For the parsing code to work nicely and have time to sort thru the data, and
// print it out we don't suggest using anything higher than 1 Hz
// Request updates on antenna status, comment out to keep quiet
GPS.sendCommand(PGCMD_ANTENNA);
// the nice thing about this code is you can have a timer0 interrupt go off
// every 1 millisecond, and read data from the GPS for you. that makes the
// loop code a heck of a lot easier!
useInterrupt(true);
delay(1000);
// Ask for firmware version
mySerial.println(PMTK_Q_RELEASE);
}
// Interrupt is called once a millisecond, looks for any new GPS data, and stores it
SIGNAL(TIMER0_COMPA_vect) {
char c = GPS.read();
// if you want to debug, this is a good time to do it!
#ifdef UDR0
if (GPSECHO)
if (c) UDR0 = c;
// writing direct to UDR0 is much much faster than Serial.print
// but only one character can be written at a time.
#endif
}
void useInterrupt(boolean v) {
if (v) {
// Timer0 is already used for millis() - we'll just interrupt somewhere
// in the middle and call the "Compare A" function above
OCR0A = 0xAF;
TIMSK0 |= _BV(OCIE0A);
usingInterrupt = true;
} else {
// do not call the interrupt function COMPA anymore
TIMSK0 &= ~_BV(OCIE0A);
usingInterrupt = false;
}
}
uint32_t timer = millis();
/******************** MAIN LOOP ********************************
****************************************************************/
void loop() // run over and over again
{
// in case you are not using the interrupt above, you'll
// need to 'hand query' the GPS, not suggested :(
if (! usingInterrupt) {
// read data from the GPS in the 'main loop'
char c = GPS.read();
// if you want to debug, this is a good time to do it!
if (GPSECHO)
if (c) Serial.print(c);
}
// if a sentence is received, we can check the checksum, parse it...
if (GPS.newNMEAreceived()) {
// a tricky thing here is if we print the NMEA sentence, or data
// we end up not listening and catching other sentences!
// so be very wary if using OUTPUT_ALLDATA and trying to print out data
//Serial.println(GPS.lastNMEA()); // this also sets the newNMEAreceived() flag to false
if (!GPS.parse(GPS.lastNMEA())) // this also sets the newNMEAreceived() flag to false
return; // we can fail to parse a sentence in which case we should just wait for another
}
// if millis() or timer wraps around, we'll just reset it
if (timer > millis()) timer = millis();
// approximately every 1 seconds or so, print out the current stats
if (millis() - timer > 1000) {
timer = millis(); // reset the timer
Serial.print("\nTime: ");
Serial.print(GPS.hour +2, DEC); Serial.print(':'); // +2 is to set clock to Oslo time
Serial.print(GPS.minute, DEC); Serial.print(':');
Serial.print(GPS.seconds, DEC); Serial.print('.');
Serial.println(GPS.milliseconds);
Serial.print("Date: ");
Serial.print(GPS.day, DEC); Serial.print('/');
Serial.print(GPS.month, DEC); Serial.print("/20");
Serial.println(GPS.year, DEC);
Serial.print("Fix: "); Serial.print((int)GPS.fix);
Serial.print(" quality: "); Serial.println((int)GPS.fixquality);
if (GPS.fix) {
Serial.print("Location: ");
Serial.print(GPS.latitude, 4); Serial.print(GPS.lat);
Serial.print(", ");
Serial.print(GPS.longitude, 4); Serial.println(GPS.lon);
Serial.print("Speed (knots): "); Serial.println(GPS.speed);
Serial.print("Angle: "); Serial.println(GPS.angle);
Serial.print("Altitude: "); Serial.println(GPS.altitude);
Serial.print("Satellites: "); Serial.println((int)GPS.satellites);
}
else {
Serial.println("No GPS FIX");
}
}
}