Multiple ultrasonic sensor doesn't work while connecting with NODEMCU and Blynk App

[ZJ0518]

Hey, I faced this issue where when I only connect one ultrasonic sensor to the NodeMCU and Blynk App, the Blynk app did notify me when someone is passing by the sensor. When I added on another ultrasonic sensor to the NodeMCU, the blynk app didn't notify me when I interrupted both sensors.
Attached below is my code to interface the ultrasonic sensors with the NodeMCU and blynk app. Please help me out guys... Thank you!

Code:

#define BLYNK_PRINT Serial

#include <ESP8266WiFi.h>

#include <BlynkSimpleEsp8266.h>

#define echoPin1 D1

#define trigPin1 D2

#define echoPin2 D3

#define trigPin2 D4





char auth[] = "***";

char ssid[] = "***";

char pass[] = "***";



long duration1;

float distance1;

long duration2;

float distance2;



void setup() {

  // put your setup code here, to run once:

  Serial.begin(9600);

  Blynk.begin(auth,ssid,pass);

  pinMode(trigPin1,OUTPUT);

  pinMode(echoPin1,INPUT);

  pinMode(trigPin2,OUTPUT);

  pinMode(echoPin2,INPUT);

}



void loop() {

  // put your main code here, to run repeatedly:

  digitalWrite(trigPin1,LOW);

  delayMicroseconds(2);

  digitalWrite(trigPin1,HIGH);

  delayMicroseconds(10);

  digitalWrite(trigPin1,LOW);

  duration1 = pulseIn(echoPin1,HIGH);

  distance1 = duration1 *0.34/2;

 

  digitalWrite(trigPin2,LOW);

  delayMicroseconds(2);

  digitalWrite(trigPin2,HIGH);

  delayMicroseconds(10);

  digitalWrite(trigPin2,LOW);

  duration2 = pulseIn(echoPin2,HIGH);

  distance2 = duration2 *0.34/2;





  if (distance1 <= 1000){

    Blynk.virtualWrite(V1,255);

    Blynk.notify("Intruder passing by sensor1 !");

  }

  else{

    Blynk.virtualWrite(V1,0);

  }

 if (distance2 <= 1000){

    Blynk.virtualWrite(V2,255);

    Blynk.notify("Intruder passing by sensor2 !");

  }

  else{

    Blynk.virtualWrite(V2,0);

  }

  Blynk.run();
  }