Ardu-Flute (An Electronic Flute) !

#include <Servo.h>
#include <FastLED.h>
Servo myservo;

#define water_flow_sensor 3
#define buzzerpin 6
#define NUM_LEDS 5
#define DATA_PIN 2

CRGB leds[NUM_LEDS];

char colour;
int button;
int clock_;
long stopwatch;
int counter;
int remap;
int ledremaptarget;
int ledremap;
int readpins;
int buttonstate1, buttonstate2, buttonstate3, buttonstate4, buttonstate5;
void setup() {

  FastLED.addLeds<NEOPIXEL, DATA_PIN>(leds, NUM_LEDS);

  myservo.attach(8);
  pinMode(7, INPUT_PULLUP);
  pinMode(9, INPUT_PULLUP);
  pinMode(10, INPUT_PULLUP);
  pinMode(11, INPUT_PULLUP);
  pinMode(12, INPUT_PULLUP);


  pinMode(water_flow_sensor, INPUT);
  pinMode(buzzerpin, OUTPUT);

  Serial.begin(9600);
  attachInterrupt(digitalPinToInterrupt(3), increase,  FALLING);
  attachInterrupt(digitalPinToInterrupt(3), decrease, RISING);
}
void loop() {
  buttonstate1 = digitalRead(9);
  buttonstate2 = digitalRead(10);
  buttonstate3 = digitalRead(11);
  buttonstate4 = digitalRead(12);
  buttonstate5 = digitalRead(7);

  if (buttonstate1 == 0) {
    tone(buzzerpin, 659); // E
//    fill_solid(leds, NUM_LEDS, CRGB::Green);
    colour = 1;
  } else if (buttonstate2 == 0) {
    tone (buzzerpin, 587); // D
//    fill_solid(leds, NUM_LEDS, CRGB::Yellow);
    colour = 2;
  } else if (buttonstate3 == 0) {
    tone(buzzerpin, 523); // C
//    fill_solid(leds, NUM_LEDS, CRGB::Cyan);
    colour = 3;
  } else if (buttonstate4 == 0) {
    tone(buzzerpin, 494); // B
//    fill_solid(leds, NUM_LEDS, CRGB::Orange);
    colour = 4;
  } else if (buttonstate5 == 0) {
    tone(buzzerpin, 440); // A
//    fill_solid(leds, NUM_LEDS, CRGB::Purple);
    colour = 5;
  } else {
    noTone (buzzerpin);
    colour = 6;
  }

  FastLED.show();
  clock_++;

}
void increase() {

  counter = clock_;

}
void decrease() {

  stopwatch = clock_ - counter;
  clock_ = 0;

  if (stopwatch <= 34) {
    remap = map(stopwatch, 34, 0, 0, 254);
    myservo.write(remap + 10);
    ledremaptarget = map(stopwatch, 34, 0, 0, 5);
    ledremap=0;
    while (ledremap != ledremaptarget) {
      
      if (colour == 1) {
        leds[ledremap] = CRGB::Green;
      } else if (colour == 2) {
        leds[ledremap] = CRGB::Yellow;
      } else if (colour == 3) {
        leds[ledremap] = CRGB::Cyan;
      } else if (colour == 4) {
        leds[ledremap] = CRGB::Orange;
      } else if (colour == 5) {
        leds[ledremap] = CRGB::Purple;
      } else if (colour == 6) {
        leds[ledremap] = CRGB::Black;
      }
      ledremap=ledremap+1;
    }
    while (ledremaptarget != 5) {
      ledremaptarget = ledremaptarget + 1;
      leds[ledremaptarget] = CRGB::Black;
    }
  }
}