/*H*******************************************************
* TimeRTCLogger.pde
* example code illustrating adding and subtracting Time.
* this sketch logs pin state change events
* the time of the event and time since the previous event is calculated and sent to the serial port. 
********************************************************/
#include <Time.h>  
#include <Wire.h> 
#include <DS1307RTC.h> // BASIC DS1307 LIBRARY THAT RETURNS TIME AS time_t

//************************* DEFINES ************************************
#define BAUD  9600
const int nbrInputPins  = 6;             // monitor 6 digital pins 
const int inputPins[nbrInputPins] = {2,3,4,5,6,7};  // pins to monitor

//************************* PROTOTYPES ************************************
void logEvent( int pin, boolean state, time_t timeNow, time_t duration );
void showTime( time_t t );
printDigits( int digits ); 
void showDuration( time_t duration );

//************************* VARIABLES ************************************
boolean state[nbrInputPins] ;                     // STATE OF MONITORED PINS
time_t  prevEventTime[nbrInputPins] ;              // TIME OF PREVIOUS EVENT

/*F********************************************************************
*
**********************************************************************/
void 
setup( )  
{
   Serial.begin( 9600 );
   setSyncProvider( RTC.get );            // FUNCTION TO SYNC TIME FROM RTC  
   for( int i =0; i < nbrInputPins; i++ )
   {
      pinMode( inputPins[i], INPUT );
      // digitalWrite( inputPins[i], HIGH );  // UNCOMMENT THESE LINES IF 
      // state[i] = HIGH;                    // PULL-UP RESISTORS ARE WANTED
   }
}
/*F********************************************************************
*
**********************************************************************/
void 
loop( )
{
   for( int i=0; i < nbrInputPins; i++ )
   {
      boolean val = digitalRead( inputPins[i] ); 
      if( val != state[i] )
      {
         time_t duration = 0; // the time since the previous event
         state[i] = val;
         time_t timeNow = now( );
         if( prevEventTime[i] > 0 )// NOT 1ST STATE CHNG, CALC TIME FROM PRIOR CHNG
            duration = duration = timeNow - prevEventTime[i];         
         logEvent( inputPins[i], val, timeNow, duration );   // LOG EVENT
         prevEventTime[i] = timeNow;         // STORE TIME FOR THIS EVENT  
      }
   }
}
/*F********************************************************************
*
**********************************************************************/
void 
logEvent( int pin, boolean state, time_t timeNow, time_t duration )
{
   Serial.print( "Pin " );
   Serial.print( pin );
   if( state == HIGH )
      Serial.print( " went High at " );
   else   
      Serial.print( " went  Low at " );
   showTime( timeNow ); 
   if( duration > 0 )
   {
      // ONLY DISPLAY DURATION IF GREATER THAN 0
      Serial.print( ", Duration was " );
      showDuration( duration );
   }
   Serial.println( );
}
/*F********************************************************************
* DISPLAY GIVEN TIME 
**********************************************************************/
void 
showTime( time_t t )
{
   Serial.print( hour( t ) );
   printDigits( minute( t ) );
   printDigits( second( t ) );
   Serial.print( " " );
   Serial.print( day( t ) );
   Serial.print( " " );
   Serial.print( month( t ) );
   Serial.print( " " );
   Serial.print( year( t ) ); 
}
/*F********************************************************************
* DIGITAL CLOCK DISPLAY: PRINTS PRECEDING COLON AND LEADING 0
**********************************************************************/
void 
printDigits( int digits )
{
   Serial.print( ":" );
   if( digits < 10 )
      Serial.print( '0' );
   Serial.print( digits );
}
/*F********************************************************************
* PRINTS DURATION IN DAYS, HOURS, MINUTES AND SECONDS
**********************************************************************/
void 
showDuration( time_t duration )
{
   if( duration >= SECS_PER_DAY )
   {
      Serial.print( duration / SECS_PER_DAY );
      Serial.print( " day( s ) " ); 
      duration = duration % SECS_PER_DAY;     
   }
   if( duration >= SECS_PER_HOUR )
   {
      Serial.print( duration / SECS_PER_HOUR );
      Serial.print( " hour( s ) " ); 
      duration = duration % SECS_PER_HOUR;     
   }
   if( duration >= SECS_PER_MIN )
   {
      Serial.print( duration / SECS_PER_MIN );
      Serial.print( " minute( s ) " ); 
      duration = duration % SECS_PER_MIN;     
   }
   Serial.print( duration );
   Serial.print( " second( s ) " );   
}