// name: Assignment 5 Jui Hong
// purpose: to create a monophonic synthesizer using the Arduino, the potentiometer and the pushbutton
// commentary: I have no idea of how to connect buzzer and potentionmeter......
// author: Jui Hong
// ip/domain: https://www.arduino.cc/en/Tutorial/BuiltInExamples/toneMelody,
// https://www.arduino.cc/reference/en/language/variables/conversion/intcast/,
// https://www.arduino.cc/reference/en/language/functions/advanced-io/tone/,
// https://www.arduino.cc/reference/en/language/functions/time/delay/,
// https://www.arduino.cc/reference/en/language/structure/further-syntax/include/,
// https://www.arduino.cc/reference/en/language/functions/communication/serial/,
// https://www.arduino.cc/reference/en/language/functions/digital-io/digitalwrite/,
// https://www.arduino.cc/reference/en/language/functions/analog-io/analogread/
// Released under MIT license

// variables
int analog_in = A0;           // from a potientiometer voltage divider
int adc_reading = 0;          // used to acquire the adc reading from the analogue input
int interval = 1;           // the interval used to flash the LED


int controltone = 0;  // analog pin used to connect the potentiometer
int val;

#include "pitches.h"

// notes in the melody:
  int melody[] = {

  sound_C, sound_D, sound_E, sound_F, sound_G, sound_A,
  };

// note durations: 4 = quarter note, 8 = eighth note, etc.:
  int noteDurations[] = {

  8, 8, 8, 8, 8, 8
};


void setup() {
  Serial.begin(9600);
  //pinMode(LED_BUILTIN, OUTPUT);

  (adc_reading) = analogRead(analog_in);              // get the analogue voltage present at the analogue input pin 
  interval = map(adc_reading, 0, 1023, 31, 988);    // scale the values 


 // iterate over the notes of the melody:

  for (int thisNote = 0; thisNote < 8; thisNote++) {

    // to calculate the note duration, take one second divided by the note type.

    //e.g. quarter note = 1000 / 4, eighth note = 1000/8, etc.

    int noteDuration = 1000 / noteDurations[thisNote];

    tone(8, melody[thisNote], noteDuration);

    // to distinguish the notes, set a minimum time between them.

    // the note's duration + 30% seems to work well:

    int pauseBetweenNotes = noteDuration * 1.30;

    delay(pauseBetweenNotes);

    // stop the tone playing:

    noTone(8);

}
}

void loop() {

  (val) = analogRead(controltone); 
  
  adc_reading = analogRead(analog_in);              // get the analogue voltage present at the analogue input pin 
  interval = map(adc_reading, 0, 1023, 100, 1000);    // scale the values 
  digitalWrite(LED_BUILTIN, HIGH);                  // activate the led
  delay(interval);                                  // delay for a limited period of time
  digitalWrite(LED_BUILTIN, LOW);                   // inactivate the led
  delay(interval);                                  // delay for a limited period of time
  Serial.println(interval);                         // confirmation message for mapped reading
  
}