#include <LiquidCrystal_I2C.h>

// Notes

#define NOTE_C4  262
#define NOTE_D4  294
#define NOTE_E4  330
#define NOTE_F4  349
#define NOTE_G4  392
#define NOTE_A4  440
#define NOTE_B4  494
#define SPEAKER_PIN 8

// LCD
#define I2C_ADDR    0x27
#define LCD_COLUMNS 20
#define LCD_LINES   4
// Set up LCD
LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);


// LED Pins: 10-Yellow, 11-Green, 12-Red, 13-Blue
const uint8_t ledPins[] = {10, 11, 12, 13};

// Variables
// tune_01 is a table containing notes to play
int tune_01[] = {NOTE_C4, NOTE_D4, NOTE_E4, NOTE_F4, NOTE_G4, NOTE_A4, NOTE_B4};
int note_time = 300;
int gap_time = 100;
int no_notes = 7; //the number of notes in the tunes array
int potpin = 0;   // port A0
int val;          // variable for reading potentiometer
long randNumber;  // random number variable
int iTune = 0;    // Note played
int iLED = 0;     // LED Pin

// Set up Section to initialize all components
void setup() {

// Set up LCD
  lcd.init();
  lcd.backlight();

// Set up LED to OUTPUT mode
  for (byte i = 0; i < 4; i++) {
    pinMode(ledPins[i], OUTPUT);
  }

// Set up Speaker to OUTPUT mode
  pinMode(SPEAKER_PIN, OUTPUT);

}


// *** Main Loop ***
void loop() {

// Print all static information (song name, titles)
  lcd.setCursor(0, 0);      // Print Song Name at Row 0, Col 0
  lcd.print("Some Random Song!");

  lcd.setCursor(0, 1);      // Print Speed title at Row 1, Col 0
  lcd.print("Speed: ");

  lcd.setCursor(0, 2);      // Print Note title at Row 2, Col 0
  lcd.print("Note : ");

// Loop from 0 to 7
  for (int i = 0; i < no_notes; i++) {

    val = analogRead(potpin);           // reads the value of the potentiometer (value between 0 and 1023)
    val = map(val, 0, 1023, 100, 500);  // scale it to use it with the servo (value between 0 and 180)
    
    lcd.setCursor(7, 1);                // Print speed at Row 1, Col 7
    lcd.print(val);

    iLED = random(0, 4);                // pick a random number from 0 to 4 for LED
    digitalWrite(ledPins[iLED], HIGH);  // Switch On LED

    randNumber = random(0, 7);          // Set a random number from 0 to 7 for tune
    iTune = tune_01[randNumber];        // Pick Note from tune_01 table
    tone(SPEAKER_PIN, iTune, val);      // play tone based on potentiometer position
    
    // Case statement to display the label of the note played
    switch (iTune) {                    // Display Note Label based on value
      case NOTE_C4:
      //  lcd.setCursor(7,2);           // Replaced all print codes with
      //  lcd.print("NOTE_C4 ");        // custom function for efficiency
      //  lcd.setCursor(15,2);
      //  lcd.print(iTune);
        LCD_Print("NOTE_C4");           // Call LCD_Print function to display
        break;
      case NOTE_D4:
      //  lcd.setCursor(7,2);           
      //  lcd.print("NOTE_D4 ");
      //  lcd.setCursor(15,2);
      //  lcd.print(iTune);
        LCD_Print("NOTE_D4");           // Call LCD_Print function to display
        break;
    case NOTE_E4:
      //  lcd.setCursor(7,2);           
      //  lcd.print("NOTE_E4 ");
      //  lcd.setCursor(15,2);
      //  lcd.print(iTune);
        LCD_Print("NOTE_E4");           // Call LCD_Print function to display
        break;
    case NOTE_F4:
      //  lcd.setCursor(7,2);           
      //  lcd.print("NOTE_F4 ");
      //  lcd.setCursor(15,2);
      //  lcd.print(iTune);
        LCD_Print("NOTE_F4");           // Call LCD_Print function to display
        break;
    case NOTE_G4:
      //  lcd.setCursor(7,2);           
      //  lcd.print("NOTE_G4 ");
      //  lcd.setCursor(15,2);
      //  lcd.print(iTune);
        LCD_Print("NOTE_G4");           // Call LCD_Print function to display
        break;
    case NOTE_A4:
      //  lcd.setCursor(7,2);           
      //  lcd.print("NOTE_A4 ");
      //  lcd.setCursor(15,2);
      //  lcd.print(iTune);
        LCD_Print("NOTE_A4");           // Call LCD_Print function to display
        break;
    case NOTE_B4:
      //  lcd.setCursor(7,2);           
      //  lcd.print("NOTE_B4 ");
      //  lcd.setCursor(15,2);
      //  lcd.print(iTune);
        LCD_Print("NOTE_B4");           // Call LCD_Print function to display
        break;
    default:
        lcd.setCursor(7,2);             // Print Blank by default
        lcd.print("             ");
        break;
}

    delay(gap_time+val);                // delay
    digitalWrite(ledPins[iLED], LOW);   // Switch Off LED       
  }
}

// Custom function to print the Note Label (more code efficient)
// iString is passed to the function for display
void LCD_Print(String iString) 
{
lcd.setCursor(7,2);             // Print Note played at Row 2, Col 7
        lcd.print(iString);
        lcd.setCursor(15,2);
        lcd.print(iTune); 
}