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

#define FIREBASE_HOST "Firebase host"
#define FIREBASE_AUTH "Firebase Auth code"
#define WIFI_SSID "your wifi Name"
#define WIFI_PASSWORD "your wifi password"

FirebaseData firebaseData;

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

int common1 = D8;
int common2 = D7;
int common3 = D4;
int common4 = D3;

String LevelTank1 = "0";
String LevelTank2 = "0";
String LevelTank3 = "0";
String LevelTank4 = "0";

void setup() {

  Serial.begin(9600);

  // Serial.setDebugOutput(true);
  
  pinMode(sensor1,INPUT_PULLUP);   
  pinMode(sensor2,INPUT_PULLUP);
  pinMode(sensor3,INPUT_PULLUP);
  pinMode(sensor4,INPUT_PULLUP);
  pinMode(common1, OUTPUT);
  pinMode(common2, OUTPUT);
  pinMode(common3, OUTPUT);
  pinMode(common4, OUTPUT);

  digitalWrite(common1, LOW);
  digitalWrite(common2, LOW);
  digitalWrite(common3, LOW);
  digitalWrite(common4, LOW);

  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(common1, HIGH);
    delay(10);   
    
    if (digitalRead(sensor4) == LOW)
    {
    LevelTank1 = "100";
    }
    else
    if (digitalRead(sensor3) == LOW)
    {
    LevelTank1 = "75";
    }
    else
    if (digitalRead(sensor2) == LOW)
    {
    LevelTank1 = "50";
    }
    else
    if (digitalRead(sensor1) == LOW)
    {
    LevelTank1 = "25";
    }
    else
    {
    LevelTank1 = "0";    
    }   

    digitalWrite(common1, LOW);
    delay(10);   
//----------------------------------------------------------------
    digitalWrite(common2, HIGH);
    delay(10);   
    
    if (digitalRead(sensor4) == LOW)
    {
    LevelTank2 = "100";
    }
    else
    if (digitalRead(sensor3) == LOW)
    {
    LevelTank2 = "75";
    }
    else
    if (digitalRead(sensor2) == LOW)
    {
    LevelTank2 = "50";
    }
    else
    if (digitalRead(sensor1) == LOW)
    {
    LevelTank2 = "25";
    }
    else
    {
    LevelTank2 = "0";    
    }   

    digitalWrite(common2, LOW);
    delay(10);   
//----------------------------------------------------------------
    digitalWrite(common3, HIGH);
    delay(10);   
    
    if (digitalRead(sensor4) == LOW)
    {
    LevelTank3 = "100";
    }
    else
    if (digitalRead(sensor3) == LOW)
    {
    LevelTank3 = "75";
    }
    else
    if (digitalRead(sensor2) == LOW)
    {
    LevelTank3 = "50";
    }
    else
    if (digitalRead(sensor1) == LOW)
    {
    LevelTank3 = "25";
    }
    else
    {
    LevelTank3 = "0";    
    }   

    digitalWrite(common3, LOW);
    delay(10);   
//----------------------------------------------------------------
    digitalWrite(common4, HIGH);
    delay(10);   
    
    if (digitalRead(sensor4) == LOW)
    {
    LevelTank4 = "100";
    }
    else
    if (digitalRead(sensor3) == LOW)
    {
    LevelTank4 = "75";
    }
    else
    if (digitalRead(sensor2) == LOW)
    {
    LevelTank4 = "50";
    }
    else
    if (digitalRead(sensor1) == LOW)
    {
    LevelTank4 = "25";
    }
    else
    {
    LevelTank4 = "0";    
    }   

    digitalWrite(common4, LOW);
    delay(10); 

    String str1 = LevelTank1 + "-" + LevelTank2 + "-" + LevelTank3 + "-" + LevelTank4;
      
//----------------------------------------------------------------


  if (Firebase.setString(firebaseData, "/level", str1)) {
    Serial.print("level ");
    Serial.print(str1);
    Serial.println(" Uploaded Successfully");
  }
  else {
    Serial.println(firebaseData.errorReason());
  }

  delay(100);

  delay(3000);
}