//FOR LCD
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2);

 //FOR ROTARY ENCODER
 #define inputCLK 3
 #define inputDT 4
 int counter = 0; 
 int currentStateCLK;
 int previousStateCLK; 

void setup() {
  Serial.begin(9600);
  //FOR LCD
  lcd.init();
  lcd.clear();
  lcd.backlight();
  lcd.setCursor(1,0);
  lcd.print("KEYLESS MUSIC");
  lcd.setCursor(3,1);
  lcd.print("INSTRUMENT");
  delay(1000);
  lcd.clear();
    lcd.setCursor(4,0);
  lcd.print("MADE BY");
    lcd.setCursor(5,1);
  lcd.print("ASBRO");
  delay(2000);
  lcd.clear();
  lcd.setCursor(1,0);
  lcd.print("MUSIC NOTE:");
  //LDR 
  pinMode(13, INPUT);
  pinMode(12, INPUT);
  pinMode(11, INPUT);
  pinMode(10, INPUT);
  pinMode(9, INPUT);
  pinMode(8, INPUT);
  pinMode(7, INPUT);
  pinMode(6, INPUT);
  //BUZZER
  pinMode(5, OUTPUT); 
  //ROTARY ENCODER
  pinMode (inputCLK,INPUT);
  pinMode (inputDT,INPUT);
  previousStateCLK = digitalRead(inputCLK);

}

void loop() {
    

    currentStateCLK = digitalRead(inputCLK);   
   if (currentStateCLK != previousStateCLK){      

     if (digitalRead(inputDT) != currentStateCLK) 
       counter --;
    else
       counter ++;      
   
     if(counter==0){
       lcd.setCursor(3,1);
       lcd.print("OCTAVE 4"); 
     }
     else if(counter==1){
        lcd.setCursor(3,1);
        lcd.print("OCTAVE 5");
     }
     else if(counter==2){
        lcd.setCursor(3,1);
        lcd.print("OCTAVE 6");
     }
     else if(counter==3){
        lcd.setCursor(3,1);
        lcd.print("OCTAVE 7");
     }
     else if(counter==-1){
        lcd.setCursor(3,1);
        lcd.print("OCTAVE 3");
     }
     else if(counter<=-2){
        lcd.setCursor(3,1);
        lcd.print("         ");
     }
     else if(counter>=4){
        lcd.setCursor(3,1);
        lcd.print("         ");
     }

     Serial.print(" -- Value: ");
     Serial.println(counter);
   } 
   previousStateCLK = currentStateCLK; 
 

 
  while(digitalRead(13)==HIGH){
    if(counter==0){
    lcd.setCursor(13,0);
    lcd.print("C4");
    tone(5,262);
   } 
   else if(counter==1) {
    lcd.setCursor(13,0);
    lcd.print("C5");
    tone(5,523);
   }
   else if(counter==2) {
    lcd.setCursor(13,0);
    lcd.print("C6");
    tone(5,1046);
   }
   else if(counter==3) {
    lcd.setCursor(13,0);
    lcd.print("C7");
    tone(5,2093);
   }
   else if(counter==-1) {
    lcd.setCursor(13,0);
    lcd.print("C3");
    tone(5,131);
   }
  }
  while(digitalRead(7) == HIGH) {
   if(counter==0) {
    lcd.setCursor(13,0);
    lcd.print("D4");
    tone(5,294);
   } 
   else if(counter==1) {
    lcd.setCursor(13,0);
    lcd.print("D5");
    tone(5,587);
   }
   else if(counter==2) {
    lcd.setCursor(13,0);
    lcd.print("D6");
    tone(5,1175);
   }
   else if(counter==3) {
    lcd.setCursor(13,0);
    lcd.print("D7");
    tone(5,2349);
   }
   else if(counter==-1) {
    lcd.setCursor(13,0);
    lcd.print("D3");
    tone(5,147);
   } 
  }
  while(digitalRead(8) == HIGH) {
   if(counter==0) {
    lcd.setCursor(13,0);
    lcd.print("E4");
    tone(5,330);
   } 
   else if(counter==1) {
    lcd.setCursor(13,0);
    lcd.print("E5");
    tone(5,659);
   }
   else if(counter==2) {
    lcd.setCursor(13,0);
    lcd.print("E6");
    tone(5,1318);
   }
   else if(counter==3) {
    lcd.setCursor(13,0);
    lcd.print("E7");
    tone(5,2637);
   }
   else if(counter==-1) {
    lcd.setCursor(13,0);
    lcd.print("E3");
    tone(5,165);
   } 
  }
  while(digitalRead(9) == HIGH) {
    if(counter==0) {
    lcd.setCursor(13,0);
    lcd.print("F4");
    tone(5,349);
   } 
   else if(counter==1) {
    lcd.setCursor(13,0);
    lcd.print("F5");
    tone(5,698);
   }
   else if(counter==2) {
    lcd.setCursor(13,0);
    lcd.print("F6");
    tone(5,1397);
   }
   else if(counter==3) {
    lcd.setCursor(13,0);
    lcd.print("F7");
    tone(5,2793);
   }
   else if(counter==-1) {
    lcd.setCursor(13,0);
    lcd.print("F3");
    tone(5,175);
   } 
  }
  while(digitalRead(10) == HIGH) {
    if(counter==0) {
    lcd.setCursor(13,0);
    lcd.print("G4");
    tone(5,392);
   } 
   else if(counter==1) {
    lcd.setCursor(13,0);
    lcd.print("G5");
    tone(5,784);
   }
   else if(counter==2) {
    lcd.setCursor(13,0);
    lcd.print("G6");
    tone(5,1568);
   }
   else if(counter==3) {
    lcd.setCursor(13,0);
    lcd.print("G7");
    tone(5,3136);
   }
   else if(counter==-1) {
    lcd.setCursor(13,0);
    lcd.print("G3");
    tone(5,196);
   } 
  }
  while(digitalRead(11) == HIGH)  {
    if(counter==0) {
    lcd.setCursor(13,0);
    lcd.print("A4");
    tone(5,440);
   } 
   else if(counter==1) {
    lcd.setCursor(13,0);
    lcd.print("A5");
    tone(5,880);
   }
   else if(counter==2) {
    lcd.setCursor(13,0);
    lcd.print("A6");
    tone(5,1760);
   }
   else if(counter==3) {
    lcd.setCursor(13,0);
    lcd.print("A7");
    tone(5,3520);
   }
   else if(counter==-1) {
    lcd.setCursor(13,0);
    lcd.print("A3");
    tone(5,220);
   }
  }
  while(digitalRead(12) == HIGH)  {
    if(counter==0) {
    lcd.setCursor(13,0);
    lcd.print("B4");
    tone(5,494);
   } 
   else if(counter==1) {
    lcd.setCursor(13,0);
    lcd.print("B5");
    tone(5,988);
   }
   else if(counter==2) {
    lcd.setCursor(13,0);
    lcd.print("B6");
    tone(5,1975);
   }
   else if(counter==3) {
    lcd.setCursor(13,0);
    lcd.print("B7");
    tone(5,3951);
   }
   else if(counter==-1) {
    lcd.setCursor(13,0);
    lcd.print("B3");
    tone(5,247);
   }
  }  
  while(digitalRead(6) == HIGH)  {
    if(counter==0) {
    lcd.setCursor(13,0);
    lcd.print("C5");
    tone(5,523);
   } 
   else if(counter==1) {
    lcd.setCursor(13,0);
    lcd.print("C6");
    tone(5,1046);
   }
   else if(counter==2) {
    lcd.setCursor(13,0);
    lcd.print("C7");
    tone(5,2093);
   }
   else if(counter==3) {
    lcd.setCursor(13,0);
    lcd.print("C8");
    tone(5,4186);
   }
   else if(counter==-1) {
    lcd.setCursor(13,0);
    lcd.print("C4");
    tone(5,262);
   }
  }
  noTone(5);

}