Arduino Fast GPS datalogger - with switchable units, configuration of U-blox GPS in runtime, and KML. The International Version !!

Well, here it is folks.

Ryan's Dad lives in Australia, and Ryan wanted to make a version of the fast GPS datalogger that his dad could use on is boat.

After sorting out the problems Ryan had with his U-blox GPS module here, we set about a few mods.

Firstly, was to be able to select the units of speed selectable when the unit first starts up. The sketch now looks for a button, connected between A3 and ground. This allows the unit to be set for KPH (Kilometres per hour), KTS (knots) and MPH (Miles per hour). This is selected by the new void configureUnits. It times out after a couple of seconds. The configureUnits void sets a flag, which selects which type of data is written to the Speed variable, and written to both the display and the card.

 Here's Ryan's version, bread-boarded and tested on the bench.










Here's the new schematic, showing the addition of the "Select units" switch, and the extra connection to the GPS module to allow us to set the Ublox receiver's configuration.

And, of course, the new code:

/* Fast GPS data logger. (c) 12th August 2016 A.G.Doswell Web Page http://andydoz.blogspot.co.uk/2016/07/arduino-fast-gps-datalogger-updated-now.html License: The MIT License (See full license at the bottom of this file) The sketch uses a U-Blox 6M GPS satellite module connected to the hardware serial interface, a 128x64 SDD1306 OLED display module connected as an I2C device to pins A4 (SDA)& A5 (SCL) and an SD card interface connected to pins 4 (CS), 11 (MOSI), 12 (MISO) & 13 (SCK) The arduino used is a Nano with 3.3v ATMEGA328P. Warning - Many SD card interfaces are not 5V. There's a toggle switch which connects pin 9 to GND for Record. Data is written to the card an impressive 4 times per second, in real-time. A pushbutton can be used, connected between pin A3 and GND to toggle through the available speed units, Knots, Kilometres per hour, or miles per hour. The OzOled library is not quite "right" for this application, but works, and is lightweight and fast enough. Thanks Oscar! It is available here : http://blog.oscarliang.net/arduino-oled-display-library/ TinyGPSPlus is available here :https://github.com/mikalhart/TinyGPSPlus */ #include <SPI.h> #include <Wire.h> #include <OzOLED.h> #include <TinyGPS++.h> #include <SD.h> int SatVal; // Number of satellites locked int Speed; // Speed in char SpeedA [4]; // Speed as char TinyGPSPlus gps; // Feed gps data to TinySGPSPlus File myFile; // Start SD int speedDigit; // Number of digits in Speedo display boolean card; // Is there a card present? boolean rec = false; // Is the record switch low? (false = high) int recPin = 9; // Record pin (Pull low to record data) boolean header = false; // Has the header been written? String filename ; // Concaternated filename +.kml String filename1 ; // Raw GPS Time filename. char fileNameChar [14]; // file name as char array int unitFlag = 0; // Flag used to set the speed units. void setup() { Serial.begin(9600);// start the comms with the GPS Rx delay (6000); // allow the u-blox receiver to come up // send serial to update u-blox rate to 200mS Serial.write(0xB5); Serial.write(0x62); Serial.write(0x06); Serial.write(0x08); Serial.write(0x06); Serial.write(0x00); Serial.write(0xC8); Serial.write(0x00); Serial.write(0x01); Serial.write(0x00); Serial.write(0x01); Serial.write(0x00); Serial.write(0xDE); Serial.write(0x6A); Serial.write(0xB5); Serial.write(0x62); Serial.write(0x06); Serial.write(0x08); Serial.write(0x00); Serial.write(0x00); Serial.write(0x0E); Serial.write(0x30); delay (100); Serial.flush(); // set 57,600 baud on u-blox Serial.write(0xB5); Serial.write(0x62); Serial.write(0x06); Serial.write(0x00); Serial.write(0x14); Serial.write(0x00); Serial.write(0x01); Serial.write(0x00); Serial.write(0x00); Serial.write(0x00); Serial.write(0xD0); Serial.write(0x08); Serial.write(0x00); Serial.write(0x00); Serial.write(0x00); Serial.write(0xE1); Serial.write(0x00); Serial.write(0x00); Serial.write(0x07); Serial.write(0x00); Serial.write(0x02); Serial.write(0x00); Serial.write(0x00); Serial.write(0x00); Serial.write(0x00); Serial.write(0x00); Serial.write(0xDD); Serial.write(0xC3); Serial.write(0xB5); Serial.write(0x62); Serial.write(0x06); Serial.write(0x00); Serial.write(0x01); Serial.write(0x00); Serial.write(0x01); Serial.write(0x08); Serial.write(0x22); delay (100); Serial.end();// stop serial coms at 9,600 baud delay (100); Serial.begin (56700); // start serial coms at 56,700 baud. pinMode (recPin, INPUT_PULLUP); // recPin as input and pulled high OzOled.init(); // initialze SDD1306 OLED display OzOled.sendCommand(0x8d); // Set displays inbuilt inverter on OzOled.sendCommand(0x14); OzOled.setBrightness(0xFF); // ... and brightness to max OzOled.clearDisplay(); // Clear the screen OzOled.setNormalDisplay(); // Set display to Normal mode pinMode(10, OUTPUT); // CS for SD card, wether it likes it, or not. OzOled.clearDisplay(); pinMode (A3, INPUT); // push button connected between A£ and GND digitalWrite (A3, HIGH); // Pull A3 high. configureUnits (); // Set the units to use. if (!SD.begin(4)) { //Check SD card is present OzOled.printString("SD card fail ", 0, 7); card = false; } else { OzOled.printString("SD card OK ", 0, 7); card = true; } OzOled.printString("Sats:", 0, 0); // Set up display OzOled.printString("Speed:", 0, 1); } void loop() { while (Serial.available() > 0) //While GPS message received if (gps.encode(Serial.read())) { displayInfo(); } } void displayInfo() { // Display the data SatVal = int(gps.satellites.value()); if (unitFlag == 3) { unitFlag = 0; } if (unitFlag == 0) { Speed = int(gps.speed.kmph()); } if (unitFlag == 1) { Speed = int(gps.speed.knots()); } if (unitFlag == 2) { Speed = int(gps.speed.mph()); } itoa (Speed, SpeedA, 10); OzOled.printNumber ((long)SatVal, 6, 0); OzOled.printBigNumber (SpeedA, 7, 1); speedDigit = strlen(SpeedA); // get length of Speed , and delete left behind zero if req'd if (speedDigit == 1) { OzOled.printBigNumber(" ", 10, 1); } if (digitalRead(recPin) == HIGH && card == true) { //If the record switch is high and the card is OK, write card data, and update display if (header == false) { if (gps.date.year() > 2000 && gps.location.age() < 1500) { // makes sure we have (at some stage since power up) a valid time, and the current fix is valid.{ // if the header hasn't been written, create a new filename with current time HHMMSSCC.kml String filename1(gps.time.value()); String filename = filename1 + ".kml"; filename.toCharArray(fileNameChar, 13); } } OzOled.printString("SD card OK REC", 0, 7); } if (digitalRead(recPin) == LOW && card == true ) { // if record switch is off, set flag and update display OzOled.printString("SD card OK ", 0, 7); } if (digitalRead(recPin) == LOW && header == true) { // if record switch is off, but the header flag is set, write the footer. writeFooter(); } if (card == true && digitalRead(recPin) == HIGH && (gps.speed.kmph() > 0)) { writeInfo(); //write the data to the SD card } smartDelay(200); } // This custom version of delay() ensures that the gps object // is being "fed". static void smartDelay(unsigned long ms) { unsigned long start = millis(); do { while (Serial.available()) gps.encode(Serial.read()); } while (millis() - start < ms); } void writeInfo() { //Write the data to the SD card fomratted for google earth kml myFile = SD.open(fileNameChar, FILE_WRITE); if (header == false) { // If the header hasn't been written, write it. if (myFile) { myFile.print(F("<?xml version=\"1.0\" encoding=\"UTF-8\"?> <kml xmlns=\"http://earth.google.com/kml/2.0\"> <document>")); header = true; // header flag set. } } if (myFile) { // write current GPS position data as KML myFile.println(F("<placemark>")); myFile.print(F("<name>")); myFile.print(Speed, 1); myFile.println(F("</name>")); myFile.print(F("<point><coordinates>")); myFile.print(gps.location.lng(), 6); myFile.print(F(",")); myFile.print(gps.location.lat(), 6); myFile.println(F("</coordinates></Point></Placemark>")); myFile.close(); // close the file: } } void writeFooter() { // if the record switch is now set to off, write the kml footer, and reset the header flag myFile = SD.open(fileNameChar, FILE_WRITE); header = false; if (myFile) { myFile.println(F("</Document>")); myFile.println (F("</kml>")); myFile.close (); } } void configureUnits () { OzOled.printString("Set units ", 0, 7); for (int i = 0; i < 30000; i++) { if (digitalRead (A3) == LOW) { unitFlag ++; } if (unitFlag == 3) { unitFlag = 0; } if (unitFlag == 0) { Speed = int(gps.speed.kmph()); OzOled.printString("KPH", 7, 6); } if (unitFlag == 1) { Speed = int(gps.speed.knots()); OzOled.printString("KTS", 7, 6); } if (unitFlag == 2) { Speed = int(gps.speed.mph()); OzOled.printString("MPH", 7, 6); } delay (10); // debounce delay } } /* Copyright (c) 2016 Andrew Doswell Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHOR(S) OR COPYRIGHT HOLDER(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */