Arduino GPS Clock

The output you are seeing in the above picture is NMEA format data received by UBlox NEO-M8M GPS module from various satellites. This output includes several lines, among these we need a line starting at $GPRMC. $GPRMC This term may be new to some of you, to understand this let us understand the format of the line starting with this word. 

Watch the video for brief overview.

Code To Receive GPS Time From $GPRMC String

$GPRMC,182306,A,1523.82,N,00022.24,W,173.8,231.8,110120,004.2,W*70 

I think this much information about the above NMEA string is sufficient to work on this project. If you want to know more about this format then please see this link. 

The image above shows the connection diagram, in this, we have connected the GPS module TX pin to the D9 pin of the Arduino Board and we are powering the GPS module through the Arduino itself. 

Code For Arduino GPS Clock

#include<LiquidCrystal.h>
LiquidCrystal lcd(7, 6, 5, 4, 3, 2);

#include <SoftwareSerial.h>
SoftwareSerial Serial1(9, 10); // RX, TX

char str[70];
char *test="$GPRMC";
int temp,i;

void setup() 
{
  lcd.begin(16,2);
  Serial1.begin(9600);
  lcd.setCursor(0,0);
  lcd.print("GPS Updated Clock");
  lcd.setCursor(0,1);
  lcd.print(" Circuit Digest ");
  delay(300);
}

void loop()
{
  serial1Event();
  if (temp) 
  {
    lcd.clear();
    int str_lenth=i;
    int x=0,comma=0;
    String UTC_hour="";
    String UTC_minut="";
    String UTC_second="";
    String UTC_date="";
    String UTC_month="";
    String UTC_year="";
    String str1="";
    while(x<str_lenth)
    {
     if(str[x]==',')
     comma++;
      if(comma==1)
      {
        x++;
        UTC_hour+=str[x++];
        UTC_hour+=str[x++];
        UTC_minut+=str[x++];
        UTC_minut+=str[x++];
        UTC_second+=str[x++];
        UTC_second+=str[x];
        comma=2;
      }

      if(comma==10)
      {
        x++;
          UTC_date+=str[x++];
          UTC_date+=str[x++];
          UTC_month+=str[x++];
          UTC_month+=str[x++];
          UTC_year+=str[x++];
          UTC_year+=str[x];
      }  
      x++;
    }

    int UTC_hourDec=UTC_hour.toInt();
    int UTC_minutDec=UTC_minut.toInt();
    int Second=UTC_second.toInt();
    int Date=UTC_date.toInt();
    int Month=UTC_month.toInt();
    int Year=UTC_year.toInt();

    int Hour=UTC_hourDec+5;
    if(Hour>23)
    {
     Hour-=24;
     Date+=1;
    }
    int Minut=UTC_minutDec+30;
    if(Minut>59)
    Minut-=60;
    
    
   // UTC_ind_zone_time
    lcd.clear();
    lcd.print("Date: ");
    lcd.print(Date);
    lcd.print("/");
    lcd.print(Month);
    lcd.print("/");
    lcd.print("20");
    lcd.print(Year);
     
     lcd.setCursor(0,1);
     lcd.print("Time: ");
     lcd.print(Hour);
    lcd.print(":");
    lcd.print(Minut);
    lcd.print(":");
    lcd.print(Second);
  //  delay(100);
    temp=0;
//    j=0;
    i=0;
    x=0;
    str_lenth=0;
//    k=0;
  }
 // delay(1000);
}

void serial1Event()
{
  while(1)
  {
   while (Serial1.available())            //checking serial data from GPS
   {
    char inChar = (char)Serial1.read();
     str[i]= inChar;                    //store data from GPS into str[]
     i++;
     if (i < 7)                      
     {
      if(str[i-1] != test[i-1])         //checking for $GPRMC sentence
      {
        i=0;
      }
     }
    if(i>65)
    {
     temp=1;
     break;
    }
  }
   if(temp)
    break;
  }
}

Conclusion