NodeMCU Ultrasonic Firebase simple 0554362082

#include <ESP8266WiFi.h>
#include <FirebaseArduino.h>

#define FIREBASE_HOST "arduino-8abef-default-rtdb.firebaseio.com"
#define FIREBASE_AUTH "DEtIc7aeX29a910jqchS3agZmJ414gHfwYSdqMdO"
#define WIFI_SSID "network"
#define WIFI_PASSWORD "123456789"

long duration;
float distance;
const int TRIGGER = 12;
const int ECHO   = 14;

void setup() {
  Serial.begin(115200);
  pinMode(TRIGGER, OUTPUT);
  pinMode(ECHO, INPUT);

  // connect to wifi.
  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
  Serial.print("connecting");
  while (WiFi.status() != WL_CONNECTED) {
    Serial.print(".");
    delay(500);
  }
  Serial.println();
  Serial.print("connected: ");
  Serial.println(WiFi.localIP());

  Firebase.begin(FIREBASE_HOST, FIREBASE_AUTH);
}

void loop() {
  digitalWrite(TRIGGER, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIGGER, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIGGER, LOW);
  duration = pulseIn(ECHO, HIGH);
  distance = (duration / 2) / 29.1;
  Serial.print(distance);
  Serial.println("Centimeter:");

  Firebase.setFloat("Distance", distance);
  // handle error
  if (Firebase.failed()) {
    Serial.print("setting /number failed:");
    Serial.println(Firebase.error());
    return;
  }
  delay(1000);
}