unsigned long Delay = 1000;
unsigned long lastmillis;
unsigned long currentMillis;
const int Ledpins[] = {2,3};
bool bright = false;
int ledState = LOW;
bool Buzzer  = false;
unsigned int fadestate = 1;

void setup() {
  Serial.begin(9600);
  Serial.println("Enter Number For Function");
  Serial.println("1) Turn On Buzzer");
  Serial.println("2) Increase LED blinking speed");  
  Serial.println("3) Decrease LED blinking speed");
  Serial.println("4) Toggle LED brightness");

}

void loop() {
  UserIn();
  Blink();
  Fade();
  // put your main code here, to run repeatedly:
}

void UserIn(){
  if (Serial.available()>0){
    int selection = Serial.read();
    switch(selection){
      case '1':
        Buzz();
        break;
      case '2':
        Delay = Delay - 100;
        Serial.println("Increasing Blink Speed");
        break;
      case '3':
        Delay = Delay + 100;
        Serial.println("Decreasing Blink Speed");
        break;
      case '4':
        fadestate = fadestate + 1;
        if (fadestate > 2){
          fadestate = 1;
        }
        Serial.println(fadestate);
        digitalWrite(3, HIGH);
        break;
    }
  }
}


void Blink(){
  unsigned long currentMillis = millis();
    if (currentMillis - lastmillis  >= Delay){
      lastmillis = currentMillis;
      if (ledState == LOW)
        ledState = HIGH;
    else {
        ledState = LOW;
    }
    digitalWrite(Ledpins[0],ledState);
  }
}

void Buzz(){
  if (Buzzer = true){
    tone(8, 262);
  }
}

void Fade(){
  switch(fadestate){
    case 1:
      analogWrite(3, 255);
    break;

    case 2:
      analogWrite(3, 20);
    break;
  }
}