IR Remote control LED countdown timer

/*
  Kung Fu Timer 2021
*/
#define NEC 1
//#define SONY 2
#include <IRLibAll.h>
#include <Wire.h>
#include <pitches.h>
#include <Adafruit_LEDBackpack.h>


// I2C address of the display.  Stick with the default address of 0x70
// unless you've changed the address jumpers on the back of the display.
#define DISPLAY_ADDRESS 0x70

// Define sensor pin
IRrecv myReceiver(5);//create the receiver, use pin 5.


#include <IRLib_P01_NEC.h>
IRdecode myDecoder;

// Define LED pin constants
const int LEDRED = 4;
const int LEDYEL = 7;
const int LEDGRN = 8;


//define musical tone
#define NOTE_C 262 //Hz

//Create display objects.  These are global variables that
//can be accessed from both the setup and loop function below.
Adafruit_7segment matrix = Adafruit_7segment();

//Set up buzzer
const int BUZZER_PIN = 12;

// Remember if the colon was drawn on the display so it can be blinked
// on and off every second.
bool blinkColon = false;

//declare tot_Time
int tot_Time = 60;

int seconds;
int now;

void setup()
{

  // Enable the IR Receiver
  myReceiver.enableIRIn();//start receiving

  // Set LED pins as Outputs
  pinMode(LEDRED, OUTPUT);
  pinMode(LEDYEL, OUTPUT);
  pinMode(LEDGRN, OUTPUT);

  pinMode(BUZZER_PIN, OUTPUT);

  //Setup Serial port
  Serial.begin(115200);
  matrix.begin(0x70);

  Serial.println("IR Remote Timer Adjustable");

}




void countDown()
{

  //turn off LEDs
  digitalWrite(LEDGRN, LOW);
  digitalWrite(LEDRED, LOW);
  digitalWrite(LEDYEL, LOW);

  tone(BUZZER_PIN, 262, 2000);
  digitalWrite(LEDGRN, HIGH);
  noTone(BUZZER_PIN);

  int now = tot_Time;
  matrix.print(now);
  matrix.writeDisplay();

  for (int i = 1; i <=  tot_Time; i++)
  {
    int now = tot_Time - i;
    int displayValue = now;
    Serial.print("Seconds = ");
    Serial.println(now);

    //Write to 7 segment display
    matrix.print(now);
    matrix.writeDisplay();
    delay(1000);

    //Control LEDs
    if (now <= 5 && now >= 2)
      digitalWrite(LEDYEL, HIGH);
    else
      digitalWrite(LEDYEL, LOW);

    if (now <= 90 && now >= 5)
      digitalWrite(LEDGRN, HIGH);
    else
      digitalWrite(LEDGRN, LOW);

    if (now <= 2 && now >= 1)
      digitalWrite (LEDRED, HIGH);
    else
      digitalWrite (LEDRED, LOW);


    //Sound buzzer if now = 1;
    if (now == 1)
    {

      tone(BUZZER_PIN, 262, 1000);
      digitalWrite(LEDRED, HIGH);
      delay(2000);
      noTone(BUZZER_PIN);

    }
    else
      noTone(BUZZER_PIN);

  }

  delay(1000);


  Serial.print("tot_Time = ");
  Serial.println(tot_Time);

}


void loop()
{

  if (myReceiver.getResults()) {
    //Continue looping until it returns true
    myDecoder.decode();// decode it
    myDecoder.dumpResults(false);//now print results


    switch (myDecoder.value)

      //NEC 1

    case 0xFFE21D: //lft
    { myReceiver.disableIRIn();      //stop receiver
      tot_Time = 90;
      matrix.writeDisplay();
      matrix.print(90);
      // Turn on LED
      digitalWrite(LEDRED, HIGH);
      digitalWrite(LEDGRN, LOW);
      digitalWrite(LEDYEL, LOW);
      Serial.println("case 0xFFE21D");

      break;



    case 0xFF02FD: //#Rt
      // Turn on LED
      myReceiver.disableIRIn();      //stop receiver
      tot_Time = 60;
      matrix.writeDisplay();
      matrix.print(60);
      digitalWrite(LEDYEL, HIGH);
      digitalWrite(LEDRED, LOW);
      digitalWrite(LEDGRN, LOW);

      Serial.println("case 0xFF02FD");
      break;


    case 0xFF609F: //up
      // Turn on LED
      myReceiver.disableIRIn();      //stop receiver

      Serial.println("case FF609F");
      digitalWrite(LEDGRN, HIGH);
      digitalWrite(LEDYEL, LOW);
      digitalWrite(LEDRED, LOW);
      delay(500);
      for (int k = 0; k < 4; k++)
      {
        digitalWrite(LEDGRN, LOW);
        delay(500);
        digitalWrite(LEDGRN, HIGH);
        delay(500);
      }

      digitalWrite(LEDGRN, HIGH);


      tone(BUZZER_PIN, 262, 1000);
      delay(2000);
      noTone(BUZZER_PIN);
      digitalWrite(LEDGRN, LOW);
      countDown();
      break;

    }

  }
  myReceiver.enableIRIn(); //restart the receiver
}