// include the library
#include <LiquidCrystal.h>

// initialize the interface pins
LiquidCrystal lcd(2,3,4,5,6,7);
int s,m,h,d,state_SET,state_UP,state_DOWN,dg,cnt;


// the 8 arrays that form each segment of the custom numbers
byte bar1[8] = 
{
        B11100,
        B11110,
        B11110,
        B11110,
        B11110,
        B11110,
        B11110,
        B11100
};
byte bar2[8] =
{
        B00111,
        B01111,
        B01111,
        B01111,
        B01111,
        B01111,
        B01111,
        B00111
};
byte bar3[8] =
{
        B11111,
        B11111,
        B00000,
        B00000,
        B00000,
        B00000,
        B11111,
        B11111
};
byte bar4[8] =
{
        B11110,
        B11100,
        B00000,
        B00000,
        B00000,
        B00000,
        B11000,
        B11100
};
byte bar5[8] =
{
        B01111,
        B00111,
        B00000,
        B00000,
        B00000,
        B00000,
        B00011,
        B00111
};
byte bar6[8] =
{
        B00000,
        B00000,
        B00000,
        B00000,
        B00000,
        B00000,
        B11111,
        B11111
};
byte bar7[8] =
{
        B00000,
        B00000,
        B00000,
        B00000,
        B00000,
        B00000,
        B00111,
        B01111
};
byte bar8[8] =
{
        B11111,
        B11111,
        B00000,
        B00000,
        B00000,
        B00000,
        B00000,
        B00000
};

// =======================================
// setup 
// =======================================

void setup()
{
  // assignes each segment a write number
  lcd.createChar(1,bar1);
  lcd.createChar(2,bar2);
  lcd.createChar(3,bar3);
  lcd.createChar(4,bar4);
  lcd.createChar(5,bar5);
  lcd.createChar(6,bar6);
  lcd.createChar(7,bar7);
  lcd.createChar(8,bar8);
  state_SET = 1;    // für den Set Button
  state_UP = 1;     // für den Up Button
  state_DOWN = 1;   // für den Down Button

  
  // sets the LCD's rows and colums:
  lcd.begin(16, 2);
  
  // sets the input pins for buttons
  // setzen auf Pullup -> gedrückt = LOW, nicht gedrückt = HIGH
  pinMode(8,INPUT_PULLUP);
  pinMode(9,INPUT_PULLUP);
  pinMode(10,INPUT_PULLUP);

  s=0;   // second
  m=0;   // minute
  h=0;   // hour

}

void custom0(int col)
{ // uses segments to build the number 0
  lcd.setCursor(col, 0); 
  lcd.write(2);  
  lcd.write(8); 
  lcd.write(1);
  lcd.setCursor(col, 1); 
  lcd.write(2);  
  lcd.write(6);  
  lcd.write(1);
}

void custom1(int col)
{
  lcd.setCursor(col,0);
  lcd.write(32);
  lcd.write(32);
  lcd.write(1);
  lcd.setCursor(col,1);
  lcd.write(32);
  lcd.write(32);
  lcd.write(1);
}

void custom2(int col)
{
  lcd.setCursor(col,0);
  lcd.write(5);
  lcd.write(3);
  lcd.write(1);
  lcd.setCursor(col, 1);
  lcd.write(2);
  lcd.write(6);
  lcd.write(6);
}

void custom3(int col)
{
  lcd.setCursor(col,0);
  lcd.write(5);
  lcd.write(3);
  lcd.write(1);
  lcd.setCursor(col, 1);
  lcd.write(7);
  lcd.write(6);
  lcd.write(1); 
}

void custom4(int col)
{
  lcd.setCursor(col,0);
  lcd.write(2);
  lcd.write(6);
  lcd.write(1);
  lcd.setCursor(col, 1);
  lcd.write(32);
  lcd.write(32);
  lcd.write(1);
}

void custom5(int col)
{
  lcd.setCursor(col,0);
  lcd.write(2);
  lcd.write(3);
  lcd.write(4);
  lcd.setCursor(col, 1);
  lcd.write(7);
  lcd.write(6);
  lcd.write(1);
}

void custom6(int col)
{
  lcd.setCursor(col,0);
  lcd.write(2);
  lcd.write(3);
  lcd.write(4);
  lcd.setCursor(col, 1);
  lcd.write(2);
  lcd.write(6);
  lcd.write(1);
}

void custom7(int col)
{
  lcd.setCursor(col,0);
  lcd.write(2);
  lcd.write(8);
  lcd.write(1);
  lcd.setCursor(col, 1);
  lcd.write(32);
  lcd.write(32);
  lcd.write(1);
}

void custom8(int col)
{
  lcd.setCursor(col, 0); 
  lcd.write(2);  
  lcd.write(3); 
  lcd.write(1);
  lcd.setCursor(col, 1); 
  lcd.write(2);  
  lcd.write(6);  
  lcd.write(1);
}

void custom9(int col)
{
  lcd.setCursor(col, 0); 
  lcd.write(2);  
  lcd.write(3); 
  lcd.write(1);
  lcd.setCursor(col, 1); 
  lcd.write(7);  
  lcd.write(6);  
  lcd.write(1);
}

void printNumber(int value, int col) {
  if (value == 0) { custom0(col); } 
  if (value == 1) { custom1(col); } 
  if (value == 2) { custom2(col); } 
  if (value == 3) { custom3(col); } 
  if (value == 4) { custom4(col); }
  if (value == 5) { custom5(col); } 
  if (value == 6) { custom6(col); } 
  if (value == 7) { custom7(col); } 
  if (value == 8) { custom8(col); } 
  if (value == 9) { custom9(col); }      
}  

// ==========================
// loop
// ==========================
// cnt=1: Minuten setzen
// cnt=2: Stunden setzen
// cnt=3: Sekunden ändern
void loop()

{
 
  // ==========================================
  // Button Auswertung
  // ==========================================

  // SET button
  if(!digitalRead(8) & state_SET==1){
    cnt++;
    state_SET=0;
    if(cnt>3){ cnt=0; }

    switch(cnt){
      case 0:
        lcd.setCursor(15, 1);
        lcd.print( " " );
        break;
      case 1:
        lcd.setCursor(15, 1);
        lcd.print( "M" );
        break;
      case 2:
        lcd.setCursor(15, 1);
        lcd.print( "H" );
        break;
      case 3:
        lcd.setCursor(15, 1);
        lcd.print( "S" );
        break;
    }
  }else if(digitalRead(8)&state_SET==0){
    state_SET=1;
  }

  // UP Button
  if(!digitalRead(9)&&state_UP==1){
    dg=1;
    state_UP=0; 
  }else if(digitalRead(9)&state_UP==0){
    state_UP=1;
  }

  // DOWN Button
  if(!digitalRead(10)&&state_DOWN==1){
    dg=-1;
    state_DOWN=0;
  } else if(digitalRead(10)&state_DOWN==0){
    state_DOWN=1;
  }
  
  // ===========================================
  // Im Set Modus (cnt=[1,2,3]) die Werte ändern
  // ===========================================
  switch(cnt){
    case 1:                 // Minuten +/+
      m = m + dg;
      dg = 0;  
      if(m>59){ m=0;  }
      if(m<0) { m=59; }
      break;
    case 2:                   // Stunden +/-
      h = h + dg;
      dg = 0;
      if(h>23){ h=0; }
      if(h<0) { h=23;}
      break;
    case 3:                  // Sekunden +/- in 10er Schritten
      if( dg !=0 ) {
        s = ((s + (dg*10))/10)*10;;
        dg = 0;
        if(s>59) { s = 0; }
        if(s<0 ) { s =59; }
      }
      break;
  }

  // Wenn Sekunden übergelaufen sind, dann Minuten +1
  // und ggf. Stunden +1
  if(s>59){
    s=0;
    m++;
  
    if(m>59){
      m=0;
      h++;
  
      if(h>23){
        h=0;
      } 
    }
  }
  

  // ===========================================
  // Anzeige der aktuellen Zeit
  // ==========================================
  
  // Stunde 10er
  d=h/10;
  printNumber(d, 0);

  // Stunde 1er
  d=h%10;
  printNumber(d, 3);
  
  // Minute 10er
  d=m/10;
  printNumber(d, 7);

  // Munute 1er
  d=m%10;
  printNumber(d, 10);
  
  // Sekunden
  if(s<10) {
    lcd.setCursor(14, 0);
    lcd.print( "0"); 
    lcd.setCursor(15, 0);
    lcd.print( String( s ) ); 
  } else {
    lcd.setCursor(14, 0);
    lcd.print( String( s ) ); 
  }
  
  // wenn im normalmodus(cnt=1), dann Sekunden +1 und Blinken und
  // 1 Sekunde warten    
  if(cnt==0){
    s++;
    lcd.setCursor(6, 0);
    lcd.print(" ");
    lcd.setCursor(6, 1);
    lcd.print(" ");
    delay(500);
  
    lcd.setCursor(6, 0);
    lcd.print(".");
    lcd.setCursor(6, 1);
    lcd.print(".");
    delay(500);
  }

}