#define PLAY 1
#define VUP 2
#define VDOWN 3
#define NEXT 4
#define PREV 5
#define PWR 6
#define IN A0 /*ANALOG*/
#define MULTIPLIER 0.0048875855
#define PULSE 500
#define WAIT 500
#define SAMPLE A1
#define PULSE 13
boolean STATUS = false;
float VAL;
unsigned long startTime = 0;
unsigned long endTime = 0;
unsigned long Started = 0;
unsigned long Ended = 0;
boolean CLOSED = false;
int CHANGED = 0;

void setup() {
pinMode(PLAY, OUTPUT);
pinMode(VUP, OUTPUT);
pinMode(VDOWN, OUTPUT);
pinMode(NEXT, OUTPUT);
pinMode(PREV, OUTPUT);
pinMode(PWR, OUTPUT);
pinMode(IN, INPUT);
Started = millis();
pinMode(SAMPLE, INPUT);
pinMode(PULSE, INPUT);
}

void loop() {
  Ended = millis() - Started;
  if(Ended > 2000){checkStatus();}
VAL = (MULTIPLIER*(analogRead(IN)));
if (VAL < 1.90){
  delay(1);
  VAL = (MULTIPLIER*(analogRead(IN)));
if((VAL > 1.60) && (VAL < 1.65)){
  volUp();
}
if((VAL > 1.45) && (VAL < 1.58)){
  volDown();
}
if(VAL < 0.1){
  otherStuff();
}}}


void volUp(){
  digitalWrite(VUP, HIGH);
  delay(PULSE);
  digitalWrite(VUP, LOW);
}
void volDown(){
  digitalWrite(VDOWN, HIGH);
  delay(PULSE);
  digitalWrite(VDOWN, LOW);
}
void PlPa(){
  digitalWrite(PLAY, HIGH);
  delay(PULSE);
  digitalWrite(PLAY, LOW);
}
void Next(){
  digitalWrite(NEXT, HIGH);
  delay(PULSE);
digitalWrite(NEXT, LOW);
}
void Prev(){
  digitalWrite(PREV, HIGH);
//    Serial.println("PREV");
delay(PULSE);
  digitalWrite(PREV, LOW);
}
void otherStuff(){
CLOSED = true;
CHANGED = 1;
startTime = millis();
endTime = millis() - startTime;
while(endTime < WAIT){

if(CLOSED == true){
  VAL = (MULTIPLIER*(analogRead(IN)));
  if(VAL > 0.02){

    CLOSED = false;
    CHANGED++;
    }
}
    if(CLOSED == false){
      VAL = (MULTIPLIER*(analogRead(IN)));
      if(VAL < 0.02){
            CLOSED = true;
        CHANGED++;
       }}

  endTime = millis() - startTime;
  delay(1);
  }

if(CHANGED == 2){PlPa();}
if(CHANGED == 4){Next();}
if(CHANGED == 6){Prev();}
releaseVal();
}
void releaseVal(){
  CHANGED = 0;
  startTime = 0;
  endTime = 0;
  CLOSED = false;
  }
void checkStatus(){
  if(analogRead(SAMPLE) > 0.01){
    STATUS = true;}
    else{
//      Serial.println("Can't identify music, sending pulse...");
      pinMode(PULSE, OUTPUT);
      digitalWrite(PULSE, HIGH);
      if(analogRead(SAMPLE) > 0.01){STATUS = true;}
      else{STATUS = false;}
      }
      digitalWrite(PULSE, LOW);
      pinMode(PULSE, INPUT);
      Started = millis();
      Ended = 0;
  }