#include <OneWire.h>             
#include <Wire.h> 
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

#define waterValve  5
#define oilValve    6
#define wled        4
#define oled        3
#define buzzer      2

const int threshold =250;
String notification;

void setup() 
{ 
  Serial.begin(9600);
  lcd.init();
  lcd.backlight();
  welcomeDisplay();
  for(uint8_t i=2;i<=6;i++)
  {
    pinMode(i,OUTPUT);
    digitalWrite(i,LOW);
  }
  alert(3); 
}

void loop() 
{
  home_display(notification);
  if(analogRead(0) >= threshold)
  {
    digitalWrite(waterValve,HIGH);
    digitalWrite(oilValve,LOW);
    digitalWrite(wled,HIGH);
    digitalWrite(oled,LOW);
    notification ="WATER DETECTED";
  }
  else
  {
    digitalWrite(waterValve,LOW);
    digitalWrite(oilValve,HIGH);
    digitalWrite(oled,HIGH);
    digitalWrite(wled,LOW);
    notification ="OIL DETECTED";
  }
  delay(500);
}

void welcomeDisplay()
{
     lcd.clear();
     lcd.setCursor(0,0);
     lcd.print("OIL WATER VALVES"); 
     lcd.setCursor(0,1);
     lcd.print("   AUTOMATION   "); 
     delay(3000);
     lcd.clear();
     lcd.setCursor(0,0);
     lcd.print("INITIALIZING SYS");
     lcd.setCursor(0,1);
     lcd.print("PLEASE WAIT ....");
}

void home_display(String TEXT)
{
     lcd.clear();
     lcd.setCursor(0,0);
     lcd.print("AUTOMATIC VALVES"); 
     lcd.setCursor(0,1);
     lcd.print(TEXT);   
}

void alert(uint8_t num)
 {
    for(uint8_t i=0;i<num;i++)
  {
    digitalWrite(buzzer,HIGH);
    delay(500);
    digitalWrite(buzzer,LOW);
    delay(500);
  }
 }