speedControl

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

//#include "TimerOne.h"
char serialData = 0;
int speed = 0;
int buzzer = 13;

const byte ZCDinterruptPin = 2;


void setup()
{
  irrecv.enableIRIn();
  irrecv.blink13(false);
  Serial.begin(9600);
  pinMode(13, OUTPUT);
//  Timer1.initialize(500000);         // Micro Seconds
  pinMode(2, INPUT);
  pinMode(A0, OUTPUT);

}

void callback()
{
  delayMicroseconds(speed); // read AD0
  digitalWrite(A0, HIGH);
  delayMicroseconds(50);  //delay 50 uSec on output pulse to turn on triac
  digitalWrite(A0, LOW);
}

void loop()
{
  if (irrecv.decode(&results)) {
    if (results.value == 0XFFFFFFFF)
      results.value = key_value;

    if ((results.value == 0x88C000C) || (results.value == 0x88C0084) || (results.value == 0x9718DE1F) ||        // LOW PLASMA
        (results.value == 0x4392537E) || (results.value == 0xA7CEC72B) || (results.value == 0xFB766165) ||
        (results.value == 0x9EFF2F3F)) {
        beep();
        speed = 2500;
        attachInterrupt(digitalPinToInterrupt(ZCDinterruptPin), callback, RISING); // attach Interrupt at PIN2
    }
    if ((results.value == 0x8810089)  || (results.value == 0x8810) ||         // MID JET COOL
        (results.value == 0x3A398D8A) || (results.value == 0x71199AC5) ||
        (results.value == 0xEE419856) || (results.value == 0x76105F79)) {
        beep();
        speed = 4866;
        attachInterrupt(digitalPinToInterrupt(ZCDinterruptPin), callback, RISING); // attach Interrupt at PIN2
    }
    if ((results.value == 0x8808350) || (results.value == 0x880830B) || (results.value == 0x880832D) ||       // HIGH FAN SPEED
        (results.value == 0x8178C8D1) || (results.value == 0x1308451C) || (results.value == 0xA11244F4) ||
        (results.value == 0xD0AE2562) || (results.value == 0x2F0AD5BB)) {
        beep();
        speed = 6000;
        attachInterrupt(digitalPinToInterrupt(ZCDinterruptPin), callback, RISING); // attach Interrupt at PIN2
    }
    if ((results.value == 0x88C0051) || (results.value == 0x3393ACC8) || (results.value == 0x1035C9DA) ||       // POWER OFF
        (results.value == 0x993AE700) || (results.value == 0x88C0)) {
        beep();
        detachInterrupt(digitalPinToInterrupt(ZCDinterruptPin));
    }

    key_value = results.value;
    irrecv.resume();
  }
}


void beep(){
  digitalWrite(13, HIGH);
  delay(100);
  digitalWrite(13, LOW);
}