//  @author: Brad Fettes <http://www.fettesps.com>
//  @thanks: Matt Sparks <http://quadpoint.org/projects/arduino-ds1302> 
//  @date: December 9, 2010
//  @purpose: Check the ds1302 to see if the chronobox should be locked or unlocked

#include <stdio.h>
#include <string.h>
#include <DS1302.h>

// Set the appropriate digital I/O pin connections 
uint8_t CE_PIN   = 5;	// RST
uint8_t IO_PIN   = 6;	
uint8_t SCLK_PIN = 7;

// Create a DS1302 object 
DS1302 rtc(CE_PIN, IO_PIN, SCLK_PIN);

// Create buffers 
char buf[50];
char day[10];

// Thanks to the Arduino library...
void check_alarms() {
  // Get the current time and date from the chip 
  Time t = rtc.time();

  // Name the day of the week 
  memset(day, 0, sizeof(day));  // clear day buffer 

  // Check the hour
  snprintf(
             buf, sizeof(buf), "%02d:%02d:%02d",            
             t.hr, t.min, t.sec
          );
  Serial.print(buf);
  Serial.print(" - ");
  switch (t.hr) {
    case 21: // After 9 pm
      Serial.println("UNLOCKED");
      break;
      
    case 22: // After 10 pm
      Serial.println("UNLOCKED");
      break;
      
    case 23: // After 11 pm
      Serial.println("UNLOCKED");
      break;
      
    default:
      Serial.println("LOCKED");
  }    
  Serial.println();
}

void set_time() {
  /* 
     Initialize a new chip by turning off write protection and clearing the
     clock halt flag. These methods needn't always be called. See the DS1302
     datasheet for details. 
  */
  rtc.write_protect(false);
  rtc.halt(false);

  /* Make a new time object to set the date and time */
  /*   Thursday, Dec 9, 2010 at 11:11:00.            */
  Time t(2010, 12, 9, 11, 11, 0, 4);

  /* Set the time and date on the chip */
  rtc.time(t);
}

void setup() {
  delay(2500); // Ensure that we have a few seconds to upload code
  Serial.begin(9600); // then start the serial communications     
  
  // Uncomment to set the time to the one defined above
  // make sure to upload it again uncommented or it will reset the 
  // date each time gets powered up
  //set_time();
}


/* Loop and print the time every second */
void loop() {
  check_alarms(); // Lock or Unlock
  delay(1000); // wait one sec
}