#include <ESP8266WiFi.h>
#include <FirebaseESP8266.h>

#define FIREBASE_HOST "database URL path"
#define FIREBASE_AUTH "API Key"
#define WIFI_SSID "ssid"
#define WIFI_PASSWORD "password"

FirebaseData firebaseData;

int sensor1 = D1;
int sensor2 = D2;
int sensor3 = D5;
int sensor4 = D6;

String LEVEL = "00";

void setup() {

  Serial.begin(9600);

  pinMode(sensor1, INPUT_PULLUP);
  pinMode(sensor2, INPUT_PULLUP);
  pinMode(sensor3, INPUT_PULLUP);
  pinMode(sensor4, INPUT_PULLUP);
  pinMode(LED_BUILTIN, OUTPUT);

  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
  Serial.print("Connecting to ");
  Serial.print(WIFI_SSID);

  while (WiFi.status() != WL_CONNECTED) {
    Serial.print(".");
    delay(500);
  }

  Serial.println();
  Serial.print("Connected to ");
  Serial.println(WIFI_SSID);
  Serial.print("IP Address is : ");
  Serial.println(WiFi.localIP());
  Firebase.begin(FIREBASE_HOST, FIREBASE_AUTH);

  Firebase.reconnectWiFi(true);

  Serial.println();
  delay(1000);
}

void loop() {

  digitalWrite(LED_BUILTIN, LOW);   // Turn the LED on

  if (digitalRead(sensor4) == LOW)
  {
    LEVEL = "100";
  }
  else if (digitalRead(sensor3) == LOW)
  {
    LEVEL = "75";
  }
  else if (digitalRead(sensor2) == LOW)
  {
    LEVEL = "50";
  }
  else if (digitalRead(sensor1) == LOW)
  {
    LEVEL = "25";
  }
  else
  {
    LEVEL = "00";
  }

  if (Firebase.setString(firebaseData, "/level", LEVEL)) {
    Serial.print("level value ");
    Serial.print(LEVEL);
    Serial.println(" Uploaded Successfully");
  }
  else {
    Serial.println(firebaseData.errorReason());
  }

  delay(100);
  digitalWrite(LED_BUILTIN, HIGH);  // Turn the LED off
  delay(3000);
}