Arduino: DateTime

Library

Download dari

http://playground.arduino.cc/Code/Time
http://playground.arduino.cc/uploads/Code/DateTime.zip

Tambahkan ke

cd /usr/share/arduino/libraries
wget  http://playground.arduino.cc/uploads/Code/DateTime.zip
unzip DateTime.zip

Code

#include <DateTime.h>
#include <DateTimeStrings.h>

#define TIME_MSG_LEN  11   // time sync to PC is HEADER and unix time_t as ten ascii digits
#define TIME_HEADER  255   // Header tag for serial time sync message

void setup(){
  Serial.begin(9600);
}

void  loop(){  
  getPCtime();   // try to get time sync from pc        
  if(DateTime.available()) { // update clocks if time has been synced
    unsigned long prevtime = DateTime.now();
    while( prevtime == DateTime.now() )  // wait for the second to rollover
      ;
    DateTime.available(); //refresh the Date and time properties
    digitalClockDisplay( );   // update digital clock

    // send our time to an app listening on the serial port
    Serial.print( TIME_HEADER,BYTE); // this is the header for the current time
    Serial.println(DateTime.now());      
  }
}

void getPCtime() {
  // if time available from serial port, sync the DateTime library
  while(Serial.available() >=  TIME_MSG_LEN ){  // time message
    if( Serial.read() == TIME_HEADER ) {        
      time_t pctime = 0;
      for(int i=0; i < TIME_MSG_LEN -1; i++){  
        char c= Serial.read();          
        if( c >= '0' && c <= '9')  
          pctime = (10 * pctime) + (c - '0') ; // convert digits to a number            
      }  
      DateTime.sync(pctime);   // Sync DateTime clock to the time received on the serial port
    }  
  }
}

void digitalClockDisplay(){
  // digital clock display of current time
  Serial.print(DateTime.Hour,DEC);  
  printDigits(DateTime.Minute);  
  printDigits(DateTime.Second);
  Serial.print(" ");
  Serial.print(DateTimeStrings.dayStr(DateTime.DayofWeek));
  Serial.print(" ");  
  Serial.print(DateTimeStrings.monthStr(DateTime.Month));  
  Serial.print(" ");
  Serial.println(DateTime.Day, DEC);  
}

void printDigits(byte digits){
  // utility function for digital clock display: prints colon and leading 0
  Serial.print(":");
  if(digits < 10)
    Serial.print('0');
  Serial.print(digits,DEC);  
}