NODEMCU ULTRASONIC

#include <ESP8266WiFi.h>
#include <ESP8266HTTPClient.h>
#include <WiFiClient.h>
#define TRIGGER_PIN D1
#define ECHO_PIN D2

  long duration, waterlevel;

  // INSERT WIFI CREDENTIALS
  const char* ssid = "WIFI USER";
  const char* password = "WIFI PASS";
  // Your Domain name with URL path or IP address with path
  const char* serverName = "WEBSITE URL";

void setup() {
  Serial.begin(115200);
  pinMode(TRIGGER_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);

  // CONNECTING TO WIFI
  WiFi.begin(ssid, password);
  Serial.println("Connecting");
  while(WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("");
  Serial.print("Connected to WiFi network with IP Address: ");
  Serial.println(WiFi.localIP());


}

void loop() {
  //INSERT DEVICEID AND LATITUDE AND LONGITUDE (NO LAT AND LONG SINCE NO GPS MODULE IS USED)
  int deviceID = 5;
  String lat = "14.627656";
  String longitude = "121.070773";
  String flooded = "";

  // GETTING LEVEL OF FLOOD
  waterlevel = ultrasonic_distance();
  Serial.print("Flood Level: ");
  Serial.println(waterlevel);

  //  CHANGE VALUE TO DETERMINE HOW HIGH IF ITS FLOODED OR NOT
  bool flood = (waterlevel >= 50);
  if (flood == 1) {
  Serial.println("The Area is Flooded.");
  flooded = "true";
  } else {
  Serial.println("The Area is not Flooded.");
    flooded = "false";
  }


  HTTPClient http;
  WiFiClientSecure client;
  client.setInsecure();

  // Your Domain name with URL path or IP address with path
  http.begin(client,serverName);


  // HTTP POST (SEND JSON TO DATABASE)
  http.addHeader("Content-Type", "application/json");
  String payload = "{\"deviceId\":\"" + String(deviceID) + "\",\"lat\":\"" + String(lat) + "\",\"long\":\"" + String(longitude) + "\",\"waterLevel\":\"" + String(waterlevel) + "\",\"flooded\":\"" + String(flooded) + "\"}"; ;
  int httpResponseCode = http.POST(payload);

  // IF RESPONSE CODE IS LESS THAN 0 THEN DATA IS NOT BEING SENT
  Serial.print("HTTP Response code: ");
  Serial.println(httpResponseCode);

  Serial.print("Data Being Sent: ");
  Serial.println(payload);

  // Free resources
  http.end();

  delay(60000);
}

long ultrasonic_distance() {
  // Send a 10 microsecond pulse to the trigger pin
  // HC-SR04 VCC -> NodeMCU 5V
  // HC-SR04 GND -> NodeMCU GND
  // HC-SR04 TRIG -> NodeMCU D1
  // HC-SR04 ECHO -> NodeMCU D2
  digitalWrite(TRIGGER_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIGGER_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIGGER_PIN, LOW);

  // Measure the duration of the echo pulse
  duration = pulseIn(ECHO_PIN, HIGH);

  // Convert the duration to a distance
  waterlevel = duration * 0.034 / 2;

  // Return the distance measurement
  return waterlevel;
}