Smarty_Clock_Alarm_LedOff.pde

#include "SFE_MicroOLED.h"

#define VIBRATE 7
#define BUTTON 4

Timer t;
boolean useAlarm = true;
int alarmHours = 7;
int alarmMinutes = 0;

SPI my_spi(P0_29, NC, P0_30);
MicroOLED my_oled(my_spi, P0_1, P0_0, P0_2);

const int CLOCK_SPEED = 1000;
// Use these variables to set the initial time
int hours = (__TIME__[0] - '0') * 10 + ( __TIME__[1] - '0') ;
int minutes = (__TIME__[3] - '0') * 10 + ( __TIME__[4] - '0') ;
int seconds = (__TIME__[7] - '0') * 10 + ( __TIME__[7] - '0') ;


// Simple function to increment seconds and then increment minutes
// and hours if necessary.
void updateTime()
{
  seconds++;  // Increment seconds
  if (seconds >= 60)  // If seconds overflows (>=60)
  {
    seconds = 0;  // Set seconds back to 0
    minutes++;    // Increment minutes
    if (minutes >= 60)  // If minutes overflows (>=60)
    {
      minutes = 0;  // Set minutes back to 0
      hours++;      // Increment hours
      if (hours >= 24)  // If hours overflows (>=12)
      {
        hours = 0;  // Set hours back to 0
      }
    }
  }
}

void setup() {
  // put your setup code here, to run once:
  my_oled.init(0, 8000000);
  my_oled.setFontType(0);
  my_oled.clear(PAGE);
  my_oled.setCursor(0, 0);
  my_oled.puts("Its Alive");
  my_oled.display();
  pinMode(VIBRATE, OUTPUT);
  pinMode(BUTTON, INPUT_PULLUP);
  t.start();
  while (t.read_ms() < 2000)
  {
  }
  t.reset();
}

void loop()
{
  if (useAlarm && hours == alarmHours && minutes == alarmMinutes) // not good this way, we will lose few seconds of clock when alarm starts becouse delays
  {
    digitalWrite(VIBRATE, HIGH);
    delay(1000);
    digitalWrite(VIBRATE, LOW);
    delay(1000);
  }

  char txtBuf[9];
  my_oled.command(DISPLAYOFF);
  // Check if we need to update seconds, minutes, hours:
  if (t.read_ms() >= CLOCK_SPEED)
  {
    updateTime();  // Add a second, update minutes/hours if necessary
    
    while (!digitalRead(BUTTON)) //not good this way, every time we hold button time will not flow...
                                // turn display only if button is hold to get more working time on battery 
    { 
      my_oled.command(DISPLAYON);
      my_oled.clear(PAGE);  // Clear the frame buffer
      sprintf(txtBuf, "%02d:%02d:%02d", hours, minutes, seconds);
      my_oled.setCursor(5, 5);
      my_oled.puts(txtBuf);
      my_oled.setCursor(9, 20);
      my_oled.puts("Smarty"); 
      my_oled.display(); // Draw the memory buffer
    }
    t.reset();
  }
}