/*************************************************
 * Public Constants
 *************************************************/

#define NOTE_B0  31
#define NOTE_C1  33
#define NOTE_CS1 35
#define NOTE_D1  37
#define NOTE_DS1 39
#define NOTE_E1  41
#define NOTE_F1  44
#define NOTE_FS1 46
#define NOTE_G1  49
#define NOTE_GS1 52
#define NOTE_A1  55
#define NOTE_AS1 58
#define NOTE_B1  62
#define NOTE_C2  65
#define NOTE_CS2 69
#define NOTE_D2  73
#define NOTE_DS2 78
#define NOTE_E2  82
#define NOTE_F2  87
#define NOTE_FS2 93
#define NOTE_G2  98
#define NOTE_GS2 104
#define NOTE_A2  110
#define NOTE_AS2 117
#define NOTE_B2  123
#define NOTE_C3  131
#define NOTE_CS3 139
#define NOTE_D3  147
#define NOTE_DS3 156
#define NOTE_E3  165
#define NOTE_F3  175
#define NOTE_FS3 185
#define NOTE_G3  196
#define NOTE_GS3 208
#define NOTE_A3  220
#define NOTE_AS3 233
#define NOTE_B3  247
#define NOTE_C4  262
#define NOTE_CS4 277
#define NOTE_D4  294
#define NOTE_DS4 311
#define NOTE_E4  330
#define NOTE_F4  349
#define NOTE_FS4 370
#define NOTE_G4  392
#define NOTE_GS4 415
#define NOTE_A4  440
#define NOTE_AS4 466
#define NOTE_B4  494
#define NOTE_C5  523
#define NOTE_CS5 554
#define NOTE_D5  587
#define NOTE_DS5 622
#define NOTE_E5  659
#define NOTE_F5  698
#define NOTE_FS5 740
#define NOTE_G5  784
#define NOTE_GS5 831
#define NOTE_A5  880
#define NOTE_AS5 932
#define NOTE_B5  988
#define NOTE_C6  1047
#define NOTE_CS6 1109
#define NOTE_D6  1175
#define NOTE_DS6 1245
#define NOTE_E6  1319
#define NOTE_F6  1397
#define NOTE_FS6 1480
#define NOTE_G6  1568
#define NOTE_GS6 1661
#define NOTE_A6  1760
#define NOTE_AS6 1865
#define NOTE_B6  1976
#define NOTE_C7  2093
#define NOTE_CS7 2217
#define NOTE_D7  2349
#define NOTE_DS7 2489
#define NOTE_E7  2637
#define NOTE_F7  2794
#define NOTE_FS7 2960
#define NOTE_G7  3136
#define NOTE_GS7 3322
#define NOTE_A7  3520
#define NOTE_AS7 3729
#define NOTE_B7  3951
#define NOTE_C8  4186
#define NOTE_CS8 4435
#define NOTE_D8  4699
#define NOTE_DS8 4978

//#include "pitches.h"  // Include the music notes library.

// Roger Beep melody:
int melody[] = {NOTE_C6, NOTE_C6, NOTE_A5, NOTE_A5}; // do mi so do.

// Roger Beep melody nodes duration: 4 = quarter of a note, 8 = eighth of a note, etc.:
int noteDurations[] = {16, 16, 16, 16}; // do mi so do.

int analogPin = A1; // PTT (push-to-talk) analog input: analog pin 2 (PTT reading from radio operator).
int pttlockPin =A2; // PTT (push-to-talk lock) analog input: analog pin 2 (PTT lock reading from radio operator).

int pttRead = 0; // Store (memorize) PTT status from operator.

int pttPrevious = 0; // Store (mmorize) PTT state of previous loop (PTT release).
int pttLock = 0; // store ptt lock state

void setup() {  // Initializations.
   pinMode(1, OUTPUT);  // Initialize digital pin LED_BUILTIN (pin 1, PTT) as an output.
   digitalWrite(1, LOW);  // Initialize PTT: OFF (turn off LED).
   pinMode(A2, INPUT);  // Initialize digital pin  (pin 0, PTT lock) as an input.
   // digitalWrite(0, LOW);  // Initialize PTT lock: OFF (turn off LED).
   
}

void loop() { // Main function, endless loop.

  delay(20); // 20 ms delay for "debouncing" PTT. 
  
  pttLock = analogRead(pttlockPin);  // Read PTT Lock input from radio operator.
  if (pttLock >500) {  // If operator chooses lock function on switch
    digitalWrite(1, HIGH); //Activate PTT on the radio
  }

  pttRead = analogRead(analogPin);     // Read PTT input from radio operator.

  if (pttRead < 512) {  // If operator presses on PTT.
      digitalWrite(1, HIGH);   // Activate the PTT on radio (turn on LED).
      pttPrevious = 1; // Goes to "1" if PTT has been depressed (memorizing PTT status).
  }

  if ((pttRead  > 512) and (pttPrevious == 1)) { // If PTT has been released by operator.
     
    for (int thisNote = 0; thisNote < 4; thisNote++) { // Play notes one by one until the end of the list or melody.

      // To calculate node duration, take 1 second divided by the note type.
      // ex: quarter of a note = 1000/8, eighth of a note = 1000/8, etc.
      int noteDuration = 500 / noteDurations[thisNote];
      tone(8, melody[thisNote], noteDuration);

      // To distinguish notes, add a minimum delay between them.  Note duration + 30% gives good results.
      int pauseBetweenNotes = noteDuration * 2.90;
      delay(pauseBetweenNotes); // Pause between notes.
      noTone(8); // Stop playing note.
    } // End of "for" loop.  Play next note.

     pttPrevious = 0; // Re-initialize PTT state memorization. 
     digitalWrite(1, LOW);    // Release PTT on radio transmitter (turn off LED).
  }
}