#include <LiquidCrystal_I2C.h>
#include <Wire.h>
#include <TimerOne.h>
LiquidCrystal_I2C lcd(0x27,16,2);
#define trigger 3
#define echo 4

#define motor 7
#define buzzer 8
float time=0,distance=0;
int temp=0;
int tanklenght=50;
int tankfulllenght=18;

int workinglenght=(tanklenght-(tanklenght*10/100));

void setup() {
  lcd.begin(16,2);
    lcd.init();
  lcd.backlight();
  pinMode(trigger,OUTPUT);
  pinMode(echo,INPUT);
  pinMode(motor, OUTPUT);
  pinMode(buzzer, OUTPUT);
  pinMode(2, OUTPUT);
  digitalWrite(2,HIGH);
  lcd.print(" Please Wait... ");
  delay(1000);
  lcd.clear();
  lcd.print("     System     ");
  lcd.setCursor(0,1);
  lcd.print(" Getting Ready ");
  delay(2000);
  lcd.clear();
  lcd.print("  WATER LEVEL  ");
  lcd.setCursor(0,1);
  lcd.print("  DISPLAY  AND  ");
  delay(1000);
  lcd.clear();
  lcd.print(" AUTOMATIC PUMP ");
  lcd.setCursor(0,1);
  lcd.print("    control    ");
  delay(2000);
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("Water Level:");
  lcd.setCursor(0,1);
  lcd.print(workinglenght);

}

void loop() {
 digitalWrite(trigger,LOW);
delayMicroseconds(2);
digitalWrite(trigger,HIGH);
delayMicroseconds(10);
digitalWrite(trigger,LOW);
delayMicroseconds(2);
time=pulseIn(echo,HIGH);  // stores time span between transmitted    and reflected waves
distance=time*340/20000;
lcd.setCursor(3,1);
lcd.print(distance);


if(distance<=workinglenght && distance>=tankfulllenght)
{
int percentage=((workinglenght-distance)/(workinglenght-tankfulllenght))*100;
lcd.setCursor(13,0);
lcd.print(percentage);
lcd.print("%");
lcd.setCursor(10,1);
lcd.print(distance);
delay(2000);
//digitalWrite(buzzer, LOW);
//delay(3000);
}

if (distance<tankfulllenght && temp==0)
{
  digitalWrite(motor, LOW);
 lcd.setCursor(0,1);
 lcd.print("Water Tank Full");
 delay(2000);
 lcd.setCursor(0,1);
 lcd.print("Motor Turned OFF");
 delay(2000);
 temp=1;
}
if (distance<tankfulllenght && temp==1)
{
  digitalWrite(motor, LOW);
}
 if (distance>workinglenght)
{
  digitalWrite(motor, HIGH);
 temp=0;
}


}