Hourly Timer With IR Control

/* Programmed using the Arduino Nano
 *  Edit the Key codes using the
 *  Serial Monitor
 */





#include <IRremote.h>

#define TIMER_INTERRUPT_DEBUG 0
#define _TIMERINTERRUPT_LOGLEVEL_ 0
#define USE_TIMER_1     true
//#define LED_BUILTIN 13

#include <TimerInterrupt.h>

const int IR_Pin = 3;
const int Buzz_Pin = 4;
bool timer_1 = LOW;    //Timer 1 State
static int relay = 2;  //Relay Pin
bool flash_led = LOW;  //BuitIN Led State
volatile int dwel = -1; //Countdown Timer :: -1 OFF, 0 SWITCH RELAY
unsigned long Press; 
byte Buzz = 100;


void TimerHandler1(void) {
  if (dwel > 0) {
    dwel--;
  }
  digitalWrite(LED_BUILTIN,flash_led);
  flash_led = !flash_led;
}



void setup() {
  pinMode (relay,OUTPUT);
  pinMode (Buzz_Pin,OUTPUT);
  digitalWrite(relay,timer_1);
  digitalWrite(Buzz_Pin, LOW);
  
//  Serial.begin(115200);     *** Enable to see the Key Codes on the serial monitor
  IrReceiver.begin(IR_Pin);
  
  ITimer1.init();
  ITimer1.attachInterruptInterval(1000,TimerHandler1);

}

void loop() {
  if (dwel == 0) {
    dwel--;
    timer_1 = !timer_1;
    digitalWrite(relay,timer_1);
    digitalWrite(Buzz_Pin, HIGH);
    delay(Buzz);
    digitalWrite(Buzz_Pin, LOW);
    delay(Buzz);
    digitalWrite(Buzz_Pin, HIGH);
    delay(Buzz);
    digitalWrite(Buzz_Pin, LOW);
    delay(Buzz);
    digitalWrite(Buzz_Pin, HIGH);
    delay(Buzz);
    digitalWrite(Buzz_Pin, LOW);
  }

  if (IrReceiver.decode()) {
//    Serial.print("Code: ");
    Press = (IrReceiver.decodedIRData.decodedRawData);
    Key_Press();
//    Serial.println(Press); *** Enable to see the Key Codes on the serial monitor
    IrReceiver.resume();
  }
  
}

void Key_Press() {
  switch (Press) {
    
    case 3125149440 :  // ON/OFF
    timer_1 = !timer_1;
    digitalWrite(relay,timer_1);
    dwel = -1;
    digitalWrite(Buzz_Pin, HIGH);
    delay(Buzz);
    digitalWrite(Buzz_Pin, LOW);
    delay(Buzz);
    digitalWrite(Buzz_Pin, HIGH);
    delay(Buzz);
    digitalWrite(Buzz_Pin, LOW);
    break;

    case 4061003520 : // 0
    dwel = 0;
    digitalWrite(Buzz_Pin, HIGH);
    delay(Buzz);
    digitalWrite(Buzz_Pin, LOW);
    delay(Buzz);
    timer_1 = !timer_1;  //dummy .. to keep relay state the same
    break;

    case 4077715200 : // 1
    dwel = 3600;
    digitalWrite(Buzz_Pin, HIGH);
    delay(Buzz);
    digitalWrite(Buzz_Pin, LOW);
    break;

    case 3877175054 : // 2
    dwel = 7200;
    digitalWrite(Buzz_Pin, HIGH);
    delay(Buzz);
    digitalWrite(Buzz_Pin, LOW);
    break;

    case 2707357440 : //3
    dwel = 10800;
    digitalWrite(Buzz_Pin, HIGH);
    delay(Buzz);
    digitalWrite(Buzz_Pin, LOW);    
    break;

    case 4144561920 : //4
    dwel = 14400;
    digitalWrite(Buzz_Pin, HIGH);
    delay(Buzz);
    digitalWrite(Buzz_Pin, LOW);
    break;

    case 3810328320 : //5
    dwel = 18000;
    digitalWrite(Buzz_Pin, HIGH);
    delay(Buzz);
    digitalWrite(Buzz_Pin, LOW);
    break;

    case 2774204160 : //6
    dwel = 21600;
    digitalWrite(Buzz_Pin, HIGH);
    delay(Buzz);
    digitalWrite(Buzz_Pin, LOW);
    break;

    case 3175284480 : //7
    dwel = 25200;
    digitalWrite(Buzz_Pin, HIGH);
    delay(Buzz);
    digitalWrite(Buzz_Pin, LOW);
    break;

    case 2907897600 : //8
    dwel = 28800;
    digitalWrite(Buzz_Pin, HIGH);
    delay(Buzz);
    digitalWrite(Buzz_Pin, LOW);
    break;

    case 3041591040 : //9
    dwel = 32400;
    digitalWrite(Buzz_Pin, HIGH);
    delay(Buzz);
    digitalWrite(Buzz_Pin, LOW);
    break;
  }
}