I've got problem with the sensor pin (how to turn off)

Hi there, I need help with my project (Smart Pillow) using Blynk app.
Let me brief a little bit about my project.

    1. User can set alarm
    1. After 20 sec alarmed, (if the user still sleep) it will notify to the phone using the motion sensor (rcwl-0516).
    1. After 40 sec, it will turn off sensor and will not notify again.

The problem that i had is at the “3)” which I cant turn off the sensor.

need help with the code.

#define BLYNK_PRINT Serial
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
#include <TimeLib.h>
#include <WidgetRTC.h>
BlynkTimer timer;
WidgetRTC rtc;
WidgetLED led1(V10);
// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "a7d4522186464dd297870f2ab8e53250";

// Your WiFi credentials.
// Set password to "" for open networks.
char ssid[] = "NabiL";
char pass[] = "limaringgitlimapuluhsen";
int flag = 0;
int buzzer = 12;
int motor = 13;
int sensor = 4;



int saat;
int on_delay;
int off_delay;
int ok_delay;

int get1 = 0;
int get2 = 0;
int nilai_sensor = 0;

void blinkLedWidget()
{
  if (led1.getValue()) {
    led1.off();
    Serial.println("LED on V1: off");
  } else {
    led1.on();
    Serial.println("LED on V1: on");
  }
}

void clockDisplay()
{
  // You can call hour(), minute(), ... at any time
  // Please see Time library examples for details

  String currentTime = String(hour()) + ":" + minute() + ":" + second();
  String currentDate = String(day()) + "/" + month() + "/" + year();
  Serial.print("Current time: ");
  Serial.print(currentTime);
  Serial.print("Current Time: ");
  Serial.print(currentDate);
  Serial.println();

  // Send time to the App
  Blynk.virtualWrite(V1, currentTime);
  // Send date to the App
  Blynk.virtualWrite(V2, currentDate);
}

BLYNK_CONNECTED() {
  // Synchronize time on connection
  rtc.begin();
}
BLYNK_WRITE(V5) // Timer
{
  Serial.println(param.asStr());
  
  
  if (param.asInt())
  {
    on_delay = saat + 20;  //20Saat
    off_delay = saat + 10;  //10Saat
    ok_delay = saat + 40;  //40Saat
  
    digitalWrite(buzzer, HIGH);
    digitalWrite(motor, HIGH);
  }
}
BLYNK_WRITE(V6) // Timer
{
  Serial.println(param.asStr());
  
  
  if (param.asInt())
  {
    on_delay = saat + 20;  //20Saat
    off_delay = saat + 10;  //10Saat
    ok_delay = saat + 40;  //40Saat
  
    digitalWrite(buzzer, HIGH);
    digitalWrite(motor, HIGH);
  }
}
BLYNK_WRITE(V0){
  Serial.println(param.asStr());
  
  
  if (param.asInt())
  {
    
    digitalWrite(buzzer, HIGH);
    digitalWrite(motor, HIGH);
    
  }
  else

  {
    digitalWrite(buzzer, LOW);
    digitalWrite(motor, LOW);
    
  }
}
BLYNK_WRITE(V12){
  Serial.println(param.asStr());
  
  
  if (param.asInt())
  {
    
    digitalWrite(buzzer, HIGH);
  }
  else

  {
    digitalWrite(buzzer, LOW);
  }
}
BLYNK_WRITE(V13){
  Serial.println(param.asStr());
  
  
  if (param.asInt())
  {

    digitalWrite(motor, HIGH);
  }
  else

  {

    digitalWrite(motor, LOW);
  }
}
void setup()
{
  // Debug console
  Serial.begin(9600);
  Blynk.begin(auth, ssid, pass);
  setSyncInterval(10 * 60); // Sync interval in seconds (10 minutes)

  // Display digital clock every 1 seconds
  timer.setInterval(1000L, clockDisplay);
timer.setInterval(1000L, blinkLedWidget);
  // Setup notification button on pin D1
  
 
  
  pinMode(13, OUTPUT);
  pinMode(12, OUTPUT);
  pinMode(4, INPUT);
 

}
void loop()
{
  saat = millis() / 1000;

  if(saat == off_delay)
  {
    digitalWrite(buzzer, LOW);
    digitalWrite(motor, LOW);
  }

  
  
   if(saat == on_delay)
  {
    Serial.println("Time Up");
    get1 = 1;
  }

     if(get1 == 1)
    {
     Serial.println("Program Sensor");
    
   nilai_sensor = digitalRead(sensor); 
  
    if(nilai_sensor == HIGH)
    {
      Serial.println("Still sleeping");
     Blynk.notify("Still sleeping");
     
    //delay(5000);
   }
  }
 
  
if(saat == ok_delay)
  { 
    Serial.println("Shut Down Sensor");
    get2 = 1;
  }
 if(get2 == 1)
  {
    Serial.println("turn off Sensor");
    nilai_sensor = digitalRead(sensor);
   digitalWrite(nilai_sensor, LOW);
    
  }

  
  Blynk.run();
  timer.run(); // Initiates BlynkTimer

}
if(saat == ok_delay)
  {
    Serial.println("Shut Down Sensor");
    get2 = 1;
  }

So you set the get2 variable to 2 when you no longer want to use the sensor. There is no need to turn it off you just ignore it when this variable is equal to 1. So everywhere you read the sensor in your code you use an if statement to either read the sensor or set the variable you would have used to the "nothing to see here" value.