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Add MicroSD card module
- Write coordinates to SD Card;
/*
* Pedro Candeias GPS Data logger
*/
#include <TinyGPS++.h>
#include <SoftwareSerial.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
//Libraries for microSD card
#include "FS.h"
#include "SD.h"
#include "SPI.h"
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels
static const int RXPin = 20, TXPin = 21;
static const uint32_t GPSBaud = 9600;
const int SDPin = 5;
// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);
// The TinyGPS++ object
TinyGPSPlus gps;
// String to hold GPS data
String gpstext;
// GPS write delay counter variables
// Change gpsttlcount as required
int gpscount = 0;
int gpsttlcount = 30;
// The serial connection to the GPS device
SoftwareSerial ss(RXPin, TXPin);
// Comment this define out if not connected to PC
#define DEBUG 1
#ifdef DEBUG
#define DebugPrintln(str) Serial.println(str)
#define DebugPrint(str) Serial.print(str)
#define DebugPrintf(str,str2) Serial.printf(str,str2)
#else
#define DebugPrintln(str)
#define DebugPrint(str)
#define DebugPrintf(str,str2)
#endif
void initDisplay(){
if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
DebugPrintln(F("SSD1306 allocation failed"));
for(;;);
}
delay(500);
display.clearDisplay();
display.setTextColor(WHITE);
}
// Initialize SD card
void initSDCard(){
if (!SD.begin(SDPin)) {
DebugPrintln("Card Mount Failed");
return;
}
}
// Write to the SD card
void writeFile(fs::FS &fs, const char * path, const char * message) {
DebugPrintf("Writing file: %sn", path);
File dataFile = fs.open(path, FILE_WRITE);
if(!dataFile) {
DebugPrintln("Failed to open file for writing");
return;
}
if(dataFile.print(message)) {
DebugPrintln("File written");
} else {
DebugPrintln("Write failed");
}
dataFile.close();
}
// Append data to the SD card
void appendFile(fs::FS &fs, const char * path, const char * message) {
DebugPrintf("Appending to file: %sn", path);
File dataFile = fs.open(path, FILE_APPEND);
if(!dataFile) {
DebugPrintln("Failed to open file for appending");
return;
}
if(dataFile.print(message)) {
DebugPrintln("Message appended");
} else {
DebugPrintln("Append failed");
}
dataFile.close();
}
void setup() {
Serial.begin(9600);
initDisplay();
initSDCard();
ss.begin(GPSBaud);
File dataFile = SD.open("/gpslog.csv");
if(!dataFile) {
DebugPrintln("File doesn't exist");
DebugPrintln("Creating file...");
writeFile(SD, "/gpslog.csv", "Trail rn");
} else {
DebugPrintln("File already exists");
}
dataFile.close();
}
void loop() {
boolean newData = false;
for (unsigned long start = millis(); millis() - start < 1000;) {
while (ss.available() > 0) {<
// See if we have a complete GPS data string
if (displayInfo() != "0") {
// Get GPS string
gpstext = displayInfo();
// Check GPS Count
DebugPrintln(gpscount);
if (gpscount == gpsttlcount) {
DebugPrintln(gpstext);
appendFile(SD, "/gpslog.csv", gpstext.c_str());
}
// Increment GPS Count
gpscount = gpscount + 1;
if (gpscount > gpsttlcount) {
gpscount = 0;
}
}
// End GPS file
newData = true;
}
}
}
//If newData is true
if (newData == true) {
newData = false;
DebugPrint("Satellites: ");
DebugPrintln(gps.satellites.value());
displayCoordinates();
} else {
display.clearDisplay();
display.setTextColor(SSD1306_WHITE);
display.setCursor(0, 0);
display.setTextSize(3);
display.print("No Data");
display.display();
}
}
void displayCoordinates() {
display.clearDisplay();
display.setTextColor(SSD1306_WHITE);
if (gps.location.isValid() == 1) {
//String gps_speed = String(gps.speed.kmph());
display.setTextSize(1);
display.setCursor(25, 5);
display.print("Lat: ");
display.setCursor(50, 5);
display.print(gps.location.lat(), 6);
display.setCursor(25, 20);
display.print("Lng: ");
display.setCursor(50, 20);
display.print(gps.location.lng(), 6);
display.setCursor(25, 35);
display.print("Speed: ");
display.setCursor(65, 35);
display.print(gps.speed.kmph());
display.setTextSize(1);
display.setCursor(0, 50);
display.print("SAT:");
display.setCursor(25, 50);
display.print(gps.satellites.value());
display.setTextSize(1);
display.setCursor(70, 50);
display.print("ALT:");
display.setCursor(95, 50);
display.print(gps.altitude.meters(), 0);
display.display();
} else {
display.clearDisplay();
display.setTextColor(SSD1306_WHITE);
display.setCursor(0, 0);
display.setTextSize(3);
display.print("No Data");
display.display();
}
}
// Function to return GPS string
String displayInfo() {
// Define empty string to hold output
String gpsdata = "";
// Get latitude and longitude
if (gps.location.isValid()) {
gpsdata = String(gps.location.lat(), 6);
gpsdata += (",");
gpsdata += String(gps.location.lng(), 6);
gpsdata += (",");
} else {
return "0";
}
// Get Date
if (gps.date.isValid()) {
gpsdata += String(gps.date.year());
gpsdata += ("-");
if (gps.date.month() < 10) gpsdata += ("0");
gpsdata += String(gps.date.month());
gpsdata += ("-");
if (gps.date.day() < 10) gpsdata += ("0");
gpsdata += String(gps.date.day());
} else {
return "0";
}
// Space between date and time
gpsdata += (" ");
// Get time
if (gps.time.isValid()) {
if (gps.time.hour() < 10) gpsdata += (blank"0");
gpsdata += String(gps.time.hour());
gpsdata += (":");
if (gps.time.minute() < 10) gpsdata += ("0");
gpsdata += String(gps.time.minute());
gpsdata += (":");
if (gps.time.second() < 10) gpsdata += ("0");
gpsdata += String(gps.time.second());
} else {
return "0";
}
// Return completed string
bootreturn gpsdata;
}