Land_Rover_LCD

#include <LiquidCrystal_I2C.h>  //I2C lcd library

LiquidCrystal_I2C lcd(0x27, 20, 4); //define I2C address of lcd and define lcd type as twenty characters, four lines

#include <NMEAGPS.h> //include GPS library

NMEAGPS gps;

#define gps_port Serial

gps_fix currentFix;

const int menuPin = 4; //define pin 4 as the button to cycle the menu

byte menuState = 0; //current state of menu button press
byte menuLastState = 0; //last state of menu button press
byte menuCounter = 0; //create to store number of presses of menu button

void setup() {

  pinMode(menuPin, INPUT); //set the menu button pin to input
  digitalWrite(menuPin, HIGH); //set the menu button pin to high

  gps_port.begin( 9600 ); //start the gps port
  lcd.init(); //start the lcd
  lcd.backlight(); //set the backlight on
  lcd.setCursor(0, 0);
  lcd.print( F("Initialising System") );  //start up message
  lcd.setCursor(0, 2);
  lcd.print(F("Please Wait..."));


  delay(3000); // display the start up message for three seconds
  lcd.clear(); //and then clear display
}

void loop(){
      while (gps.available( gps_port )) { //while the GPS port is available,
      currentFix = gps.read(); //read the GPS
}
      menu(); //run the menu function
}

void menu() {

  menuState = digitalRead(menuPin); //check if the menu button has been pressed
  if(menuState != menuLastState)
  {
  if(menuState == 1)
  {
  menuCounter++; //increment the counter
  }
  if (menuState == 1)

  {
  if(menuCounter==1) {
    time(); //run the time function
  }
  if(menuCounter==2) {
    position(); //run the position function
  }
  if(menuCounter==3) {
    speed(); //run the speed function
  }
  if(menuCounter==4){
    engine(); //place holder, currently non functional
  }
  if(menuCounter==5){
  weather(); //place holder, currently non functional
  }
  if(menuCounter>4) menuCounter=0; //reset the counter to go back to the start
  }
  menuLastState = menuState; //remember the state of the button press
  delay(20); //short delay for debouncing
  }
}


void time() {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print(F("Current Time & Date")); //display function title
    if (currentFix.valid.time) { //if the signal is valid
    lcd.setCursor(0,2);
    if (currentFix.dateTime.hours < 10)  //to display a zero in front of single digit hours
    lcd.print( '0' );
    lcd.print(currentFix.dateTime.hours ); //display the hour
    lcd.print( ':' );
    if (currentFix.dateTime.minutes < 10) //to display a zero in front of single digit minutes
    lcd.print( '0' );
    lcd.print(currentFix.dateTime.minutes ); //display the minute
    lcd.print( ':' );
    if (currentFix.dateTime.seconds < 10) //to display a zero in front of single digit seconds
    lcd.print( '0' );
    lcd.print(currentFix.dateTime.seconds ); //display the seconds
    lcd.print(F(" UTC")); //indicate time displayed is "UTC"
    lcd.setCursor(0, 3);
    if (currentFix.dateTime.date < 10) //to display zero in front of single digit date
    lcd.print( '0' );
    lcd.print(currentFix.dateTime.date ); //display date
    lcd.print( '/' );
    if (currentFix.dateTime.month < 10) //to display zero in front of single digit month
    lcd.print( '0' );
    lcd.print(currentFix.dateTime.month ); //display month
    lcd.print( '/' );
    if (currentFix.dateTime.year < 10) //to display zero in front of single digit year
    lcd.print( '0' );
    lcd.print(currentFix.dateTime.year ); //display year
    }
}

void position() {
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print(F("Position & Altitude")); //display function title
    if (currentFix.valid.altitude) { //if signal is valid
    lcd.setCursor(0, 1);
    lcd.print(currentFix.altitude(), 2); //display altitude
    lcd.print(F(" Metres"));   //in metres
    }
    if (currentFix.valid.location) { //if signal is valid
    lcd.setCursor(0, 2);
    lcd.print(currentFix.latitude(), 6); //display latitude to six decimal places
    lcd.print(F(" Latitude"));
    lcd.setCursor(0, 3);
    lcd.print(currentFix.longitude(), 6); //display longitude to six decimal places
    lcd.print(F(" Longitude"));
    }
}


void speed() {
    lcd.clear();
    lcd.setCursor(0,0);
    lcd.print(F("Speed & Heading")); //display function title
    if (currentFix.valid.speed) { //if signal is valid
    lcd.setCursor(0, 2);
    lcd.print(currentFix.speed_mph(), 2); //display speed to two decimal places
    lcd.print(F(" MPH")); //in miles per hour
    lcd.setCursor(0, 3);
    lcd.print(currentFix.heading(), 3); //display heading to three decimal places
    lcd.print(F(" DEG")); //in degrees
    }
}

 void engine(){ //Temporary placeholder dummy function
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print(F("Engine Monitoring"));
  lcd.setCursor(0, 1);
  lcd.print(F("Coolant Temp:"));
  lcd.setCursor(0, 2);
  lcd.print(F("Eng' Oil Temp:"));
  lcd.setCursor(0, 3);
  lcd.print(F("G'box Oil Temp:"));
 }

 void weather(){ //Temporary placeholder dummy function
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print(F("Weather Conditions"));
  lcd.setCursor(0, 1);
  lcd.print(F("Temperature:"));
  lcd.setCursor(0, 2);
  lcd.print(F("Pressure:"));
  lcd.setCursor(0, 3);
  lcd.print(F("Humidity:"));
  }