SpeedControlSerial

#define Relay 8

#include<Timer1.h>

#include <IRremote.h>
int RECV_PIN = 7;
IRrecv irrecv(RECV_PIN);
unsigned long key_value = 0;
decode_results results;

#define buzzer 13
int fanval[5] = {85,40,10};
int timeval;
bool interruptState = false;
boolean  fan;
char data = 0;

void setup()
{
  Serial.begin(9600);
  irrecv.enableIRIn();
  irrecv.blink13(false);

  pinMode(A0, OUTPUT);
  pinMode(2, INPUT);
  pinMode(Relay, OUTPUT);

  pinMode(buzzer, OUTPUT);
  digitalWrite(buzzer, LOW);

  digitalWrite(buzzer, HIGH);
  delay(150);
  digitalWrite(buzzer, LOW);
  fan = false;
}

void dimmer()
{
  long int dimval;
  dimval = timeval * 75;
  startTimer1(dimval);
}

ISR(timer1Event)
{
  //resetTimer1();

  pauseTimer1();
  digitalWrite(A0,HIGH);
  delayMicroseconds(100);
  digitalWrite(A0,LOW);


}

void ping()
{
  digitalWrite(buzzer, HIGH);
  delay(100);
  digitalWrite(buzzer, LOW);
}



void loop()
{
  if (Serial.available() > 0);
  {
    data = Serial.read();
    if(data == '1'){
      digitalWrite(Relay, LOW);
      ping();
      //TODO
      digitalWrite(Relay, LOW);
      detachInterrupt(0);
      interruptState = false;
    }
////////////////////////////////////////////////////////////////////////////////////////////////////////
    if(data == '2'){
      ping();
      digitalWrite(Relay, HIGH);
      timeval = fanval[0];
      if(interruptState == false){
        attachInterrupt(0,dimmer,FALLING);
        interruptState = true;
      }
    }
////////////////////////////////////////////////////////////////////////////////////////////////////////
    if(data == '3'){
      ping();
      digitalWrite(Relay, HIGH);
      timeval = fanval[1];
      if(interruptState == false){
        attachInterrupt(0,dimmer,FALLING);
        interruptState = true;
      }
    }
////////////////////////////////////////////////////////////////////////////////////////////////////////
    if(data == '4'){
      ping();
      digitalWrite(Relay, HIGH);
      timeval = fanval[2];
      if(interruptState == false){
        attachInterrupt(0,dimmer,FALLING);
        interruptState = true;
      }
    }
////////////////////////////////////////////////////////////////////////////////////////////////////////
  }
  delay(10);
}