무선 송수신기 + GPS + LCD

다수의 receiver들이 사방에 있으면서 자신의 gps값을 공중으로 전송시킵니다.

또한 center에는 데이터를 받는 하나의 수신 모듈이 있습니다.

 center는 receiver의 gps값을 읽어드립니다.

이 모듈을 컴퓨터와 연결 되어있으며 이 데이터를 컴퓨터가 받은 후 컴퓨터 화면 창에 위치를 찍어줍니다.

receiver는 아두이노에 GPS, LCD, RH447이 연결되어 있습니다.

회로도.pdf

center는 오로지 RH447과 아두이노로만 구성되어 있으며 단순이 값을 읽어들이는 일만 처리합니다.

receiver의 코드

#include "SoftwareSerial.h" //wireless trans
#include "TinyGPS.h" //GPS
#include <LiquidCrystal.h> //LCD
 
#define HEMISPHERE_PIN 13
#define GPS_RX_PIN 5
#define GPS_TX_PIN 6
#define USERID 333333
 
SoftwareSerial mySerial(5,6); //wireless trans
TinyGPS gps;//GPS
SoftwareSerial ss(GPS_RX_PIN, GPS_TX_PIN);
LiquidCrystal lcd(12,11,10,9,8,7); //LCD
 
//wireless trans & GPS
long lat, lon;
char buffer_id[7], buffer_lat[13], buffer_lon[13];
int count_trans = 0;
 
//LCD
long display_lat=0, display_lon = 0;
int i = 1;
int count; // ...
int check_gps = 0; // !
 
void setup()
{
  Serial.begin(9600);
  mySerial.begin(9600);
  ss.begin(9600);
  lcd.begin(16,2);
  pinMode(HEMISPHERE_PIN, OUTPUT);
  digitalWrite(HEMISPHERE_PIN, LOW);
}
 
void loop()
{
  read_GPS();
 
  
  //make lat and lon to three num
   display_lat = lat%1000;
   display_lon = lon%1000;
        
  //converting number to string
  ltoa(USERID, buffer_id, 10);
  ltoa(lat, buffer_lat, 10);
  ltoa(lon, buffer_lon, 10);
  
  //send GPS value to center
  if(count_trans > 30){  //sending speed
  mySerial.print(buffer_id);
  mySerial.print("i");
  mySerial.print(buffer_lat);
  mySerial.print("t");
  mySerial.print(buffer_lon);
  mySerial.print("n");
  count_trans = 0;
  delay(10); //because of multiple serial comunication
  }
  
  //count_trans++
  count_trans++;
  
  //-----------------------------LCD
  if(display_lat == 0 && display_lon == 0)
    loading();
  else
  {
    print_3num(display_lat, 0, 0);//first line
    if(check_gps > 200) // ! time
    print_text('!', 3, 0);
    else
    print_text('.', 3, 0);
    print_3num(display_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);
  delay(10);
  
  //count looop
  count++;
  check_gps++;
  if(count == 25)
  {i++; //the number of dot, that is increased by count
   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(".");
}
 
void read_GPS(void)
{
   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);
    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);
        
         check_gps=0;
         break;
    }
  }
}
 

center의 코드

//receive
 
#include <SoftwareSerial.h>
SoftwareSerial mySerial(5,6);
 
char char_value = 0, pre_char = 0;
long long_value = 0;
long id_val = 0, lon_val = 0, lat_val = 0;
char lon_char[13] = {'0'}, lat_char[13] = {'0'};
int nullLoc = 0;
const char id = 'i', lat = 't', lon = 'n';
 
void setup()
{
Serial.begin(9600);
mySerial.begin(9600);
}
 
 
void loop() // 반복
{
  if (mySerial.available())
  {
    char_value = mySerial.read();
   if(isDigit(char_value))
   {
     long_value = (long_value*10)+(char_value - '0');
   }
    else if(char_value == id)
   {
     id_val = long_value;
     long_value = 0;
     Serial.print("<");
     Serial.print(id_val);
     delay(5);
   }
   else if(char_value == lat)
   {
     lat_val = long_value;
     long_value = 0;
     
      //debugging
      //Serial.print("   ,  origin lat:  "); Serial.print(lat_val);
     //converint num to string
     ltoa(lat_val, lat_char, 10);
     //NULL location
     NULL_location(&nullLoc, lat_char);
     //input dot
     inputDOT(nullLoc, lat_char);
     
     Serial.print(",");
     Serial.print(lat_char);
     delay(5);
   }
    else if(char_value == lon)
   {
     if(pre_char != 'o'){
       
     
     lon_val = long_value;
     long_value = 0;
     
     //debugging
     //Serial.print("   ,  origin lon:  "); Serial.print(lon_val);
     //converint num to string
     ltoa(lon_val, lon_char, 10);
     //NULL location
     NULL_location(&nullLoc, lon_char);
     //input dot
     inputDOT(nullLoc, lon_char);
     
     Serial.print(",");
     Serial.print(lon_char);
     Serial.println(">");
     delay(5);
     }
     
     pre_char = 0;
   }
   
   else if(char_value == 'o' || char_value == 'O')
   {
     pre_char = char_value;
     id_val = long_value;
     long_value = 0;
     Serial.print("<");
     Serial.println(id_val);
     delay(5);
   }
  }
}
 
void NULL_location(int * val, char * charPtr)
{
    int count = 0;
 
    while(charPtr[count] != NULL)
        count = count+1;
    
    *val = count;
}
 
void inputDOT(int  val, char * charPtr)
{
    int count = 0;
 
    while(count<6)
    {
        charPtr[val+1-count] = charPtr[val-count];
        count++;
    }
    charPtr[val - 5] = '.';
}