GPS 값을 받아서 LCD제어

아두이노로 GPS의 값을 받아서 LCD로 이 값을 나타내는 것을 해보았습니다.

1. 우선 작품에 쓸 LCD 테스트 코드이구요.

#include <LiquidCrystal.h>
 
// LCD
LiquidCrystal lcd(12,11,10,9,8,7);
 
void setup()
{
  lcd.begin(16,2);
}
 
void loop()
{
  print_3num(1, 0, 0);
  print_text('.', 3, 0);
 
  print_3num(2, 4, 0);
  print_text('/', 7, 0);
  
  print_3num(3, 8, 0);
  
 
  print_3num(4, 0, 1);
  print_text('.', 3, 1);
  
  print_3num(5, 4, 1);
  print_text('/', 7, 1);
  
  print_3num(6, 8, 1);
}
 
void print_3num(int n, int p1, int p2)
{
  if(n>99)
  {
    lcd.setCursor(p1, p2);
    lcd.print(n);
  }
  else if(n>9)
  {
    lcd.setCursor(p1, p2);
    lcd.print("0");
    lcd.setCursor(p1+1, p2);
    lcd.print(n);
  }
  else if(n>=0)
  {
    lcd.setCursor(p1, p2);
    lcd.print("00");
    lcd.setCursor(p1+2, p2);
    lcd.print(n);
  }
}
 
void print_text(char a, int p1, int p2)
{
lcd.setCursor(p1, p2);
lcd.write(a);
}

2. 다음은 아두이노가 GPS값을 읽어내는 코드입니다.

 gps_datasheet.pdf

 

#include "TinyGPS.h"
#include "SoftwareSerial.h"
 
#define HEMISPHERE_PIN 13
#define GPS_RX_PIN 5
#define GPS_TX_PIN 6
 
TinyGPS gps;
SoftwareSerial ss(GPS_RX_PIN, GPS_TX_PIN);
 
void setup()
{
  Serial.begin(9600);
  ss.begin(9600);
  pinMode(HEMISPHERE_PIN, OUTPUT);
  digitalWrite(HEMISPHERE_PIN, LOW);
}
void loop()
{
  while (ss.available())
  {
    int c = ss.read();
    Serial.write(c);
 
    if (gps.encode(c))
    {
      long lat, lon;
     unsigned long fix_age;
    gps.get_position(&lat, &lon, &fix_age);
    if (fix_age == TinyGPS::GPS_INVALID_AGE )
      Serial.println("No fix ever detected!");
    else if (fix_age > 2000)
      Serial.println("Data is getting STALE!");
    else
      Serial.println("Latitude and longitude valid!");
      
      Serial.print("Lat: "); 
      Serial.print(lat);
      Serial.print(" Lon: "); 
      Serial.println(lon);
      if (lat < 0)
        digitalWrite(HEMISPHERE_PIN, HIGH);
      else
        digitalWrite(HEMISPHERE_PIN, LOW);
    }
  }
}

3. 이 두 코드를 합쳐서 LCD에 나타내야 되는데요. 

여기서 문제는 초반에 GPS 값을 못 읽어 들였을 때는 Loading 이라는 문구와 처리 중이라는 영상이 나오도록 하는 것이였 습니다.

//LCD
#include <LiquidCrystal.h>
//GPS
#include "TinyGPS.h"
#include "SoftwareSerial.h"
#define HEMISPHERE_PIN 13
#define GPS_RX_PIN 5
#define GPS_TX_PIN 6
 
//LCD
LiquidCrystal lcd(12,11,10,9,8,7);
//GPS
TinyGPS gps; 
SoftwareSerial ss(GPS_RX_PIN, GPS_TX_PIN);
long lat=0, lon=0;
int i = 1;
int count; // ...
int check_gps = 0; // !
 
void setup()
{
  //LCD
  lcd.begin(16,2);
  //GPS
  Serial.begin(9600); 
  ss.begin(9600);
  pinMode(HEMISPHERE_PIN, OUTPUT);
  digitalWrite(HEMISPHERE_PIN, LOW);
}
 
void loop()
{
  //GPS
  while (ss.available())
  {
    int c = ss.read();
    Serial.write(c);
    if (gps.encode(c))
    {
     unsigned long fix_age;
     gps.get_position(&lat, &lon, &fix_age);
    lat = (lat % 100000) * 60;//calculate lat, lon
    lat = (lat % 100000) / 100;
    lon = (lon %100000) * 60;
    lon = (lon %100000) / 100;
    
    check_gps=0;
    break;
    }
  }
  
  //LCD
  if(lat == 0 && lon == 0)
    loading();
  else
  {
    print_3num(lat, 0, 0);//first line
    if(check_gps > 400) // ! time
    print_text('!', 3, 0);
    else
    print_text('.', 3, 0);
    print_3num(lon, 4, 0);
    print_text('/', 7, 0);
    print_3num(4, 0, 1);//second line 
    print_text('.', 3, 1);
    print_3num(5, 4, 1);
  }
  print_3num(3, 8, 0);
  print_text('/', 7, 1);
  print_3num(6, 8, 1);
  
  //count looop
  count++;
  check_gps++;
  if(count == 25)
  {i++;
   count =0;}
}
 
void print_3num(int n, int p1, int p2)
{
  if(n>99)
  {
    lcd.setCursor(p1, p2);
    lcd.print(n);
  }
  else if(n>9)
  {
    lcd.setCursor(p1, p2);
    lcd.print("0");
    lcd.setCursor(p1+1, p2);
    lcd.print(n);
  }
  else if(n>=0)
  {
    lcd.setCursor(p1, p2);
    lcd.print("00");
    lcd.setCursor(p1+2, p2);
    lcd.print(n);
  }
}
 
void print_text(char a, int p1, int p2)
{
lcd.setCursor(p1, p2);
lcd.write(a);
}
 
void loading(void)
{
  //first line
  lcd.setCursor(0,0);
  lcd.print("Loading");
  print_text('/', 7, 0);
    
  //second line  
  lcd.setCursor(0, 1);
  lcd.print(".");
  lcd.setCursor(0, 1);
  print_text('/', 7, 1);
  print_3num(6, 8, 1);
  if(i==7)//reset
   {
     lcd.setCursor(0, 1);
     lcd.print(".      ");
     i=1;
   }
   lcd.setCursor(i, 1);//...
   lcd.print(".");
}