#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

const int trigger = 32;
const int echo = 33;
const int pump = 25;
const int buzzer = 26;
int pumpstate = LOW;
bool buzzFlag = false;
int waterlevel;
int levellow = 0;
int levelhigh = 400;
byte zero[8] = {0b00100, 0b01010, 0b10001, 0b10001, 0b10001, 0b10001, 0b10001, 0b11111};
byte ten[8] = {0b00100, 0b01010, 0b10001, 0b10001, 0b10001, 0b10001, 0b11111, 0b11111};
byte twentyfive[8] = {0b00100, 0b01010, 0b10001, 0b10001, 0b10001, 0b11111, 0b11111, 0b11111};
byte fifty[8] = {0b00100, 0b01010, 0b10001, 0b10001, 0b11111, 0b11111, 0b11111, 0b11111};
byte seventyfive[8] = {0b00100, 0b01010, 0b10001, 0b11111, 0b11111, 0b11111, 0b11111, 0b11111};
byte hundred[8] = {0b00100, 0b01010, 0b11111, 0b11111, 0b11111, 0b11111, 0b11111, 0b11111};

void setup(){
   lcd.init();
   lcd.clear();
   lcd.backlight();
   lcd.setCursor(5, 0);
   lcd.print("SMART");
   lcd.setCursor(2, 1);
   lcd.print("WATER PUMP");
   delay(2000);
   lcd.createChar(0, zero);
   lcd.createChar(1, ten);
   lcd.createChar(2, twentyfive);
   lcd.createChar(3, fifty);
   lcd.createChar(4, seventyfive);
   lcd.createChar(5, hundred);
   lcd.clear();
   pinMode(trigger, OUTPUT);
   pinMode(echo, INPUT);
   pinMode(pump, OUTPUT);
   pinMode(buzzer, OUTPUT);
}

void pumpAutomate(){
   if(waterlevel <= 15 && pumpstate == LOW){
      if(buzzFlag == false){
         digitalWrite(buzzer, HIGH);
         delay(1000);
         digitalWrite(buzzer, LOW);
         buzzFlag = true;
      }
      pumpstate = HIGH;
   }
   else if(waterlevel >= 90 && pumpstate == HIGH){
      pumpstate = LOW;
   }
}

void tank() {
     if (waterlevel >= 0 && waterlevel < 10) {
      lcd.setCursor(15, 0);
      lcd.write(0);
    }
      if (waterlevel >= 10 && waterlevel < 25) {
      lcd.setCursor(15, 0);
      lcd.write(1);
   }
   if (waterlevel >= 25 && waterlevel < 50) {
   lcd.setCursor(15, 0);
   lcd.write(2);
}
   if (waterlevel >= 50 && waterlevel < 75) {
   lcd.setCursor(15, 0);
   lcd.write(3);
}
   if (waterlevel >= 75 && waterlevel < 100) {
   lcd.setCursor(15, 0);
   lcd.write(4);
}
   if (waterlevel >= 100){
   lcd.setCursor(15, 0);
   lcd.write(5);
 }
}

void loop(){
   digitalWrite(pump, pumpstate);
   digitalWrite(trigger, HIGH);
   delayMicroseconds(10);
   digitalWrite(trigger, LOW);

   float duration = pulseIn(echo, HIGH);
   float distance = 0.017 * duration;
   waterlevel = map(distance, levellow, levelhigh, 0, 100);

   lcd.setCursor(11, 0);
     lcd.print(waterlevel);
       lcd.setCursor(14, 0);
         lcd.print("%");

void pumpAutomate();
void tank();
   lcd.setCursor(1,1);
   lcd.print("WATER PUMP=");
   lcd.println(pumpstate ? "ON " : "OFF");
}