#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);
const int trigger = 34;
const int echo = 35;
const int pump = 32;
const int buzzer = 27;
const int button1 = 33;
const int button2 = 25;
const int button3 = 26;
float distance, duration, waterlevel;
bool pumpstate, mode, buzzerstatus;
int buzzercount;


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.noBacklight();
    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(button1, INPUT_PULLUP);
    pinMode(button2, INPUT_PULLUP);
    pinMode(button3, INPUT_PULLUP);
}

void autoMode(){
    if(waterlevel >= 85.0){
        pumpstate = false;
    }
    else if(waterlevel <= 15.0){
        if(buzzercount != 2){
        digitalWrite(buzzer, HIGH);
        delay(500);
        digitalWrite(buzzer, LOW);
        delay(500);
        digitalWrite(buzzer, HIGH);
        delay(500);
        digitalWrite(buzzer, LOW);
        delay(500);
        buzzercount = 2;
            }
        pumpstate = true;
    }

}

void manualMode(){
    if(digitalRead(button2) == LOW){
        pumpstate = !pumpstate;
    }
}

void tank(){
    if(waterlevel >= 0.0 && waterlevel < 10.0){
        lcd.setCursor(15,0);
        lcd.write(0);
    }
    if(waterlevel >= 10.0 && waterlevel < 25.0){
        lcd.setCursor(15,0);
        lcd.write(1);
    }
    if(waterlevel >= 25.0 && waterlevel < 50.0){
        lcd.setCursor(15,0);
        lcd.write(2);
    }
    if(waterlevel >= 50.0 && waterlevel < 75.0){
        lcd.setCursor(15,0);
        lcd.write(3);
    }
    if(waterlevel >= 75.0 && waterlevel < 100.0){
        lcd.setCursor(15,0);
        lcd.write(4);
    }
    if(waterlevel >= 100.0){
        lcd.setCursor(15,0);
        lcd.write(5);
    }
}

void modeShift(){
    if(!mode && waterlevel <= 15.0 || waterlevel >= 85.0){
        mode = true;
        if(!buzzerstatus){
            digitalWrite(buzzer, HIGH);
            delay(2000);
            digitalWrite(buzzer, LOW);
            buzzerstatus = true;
        }
    }
}

void loop(){
    
    digitalWrite(trigger, HIGH);
    delay(10);
    digitalWrite(trigger, LOW);
    duration = pulseIn(echo, HIGH);
    distance = 0.017 * duration;
    waterlevel = map(distance, 0.0, 10.0, 100.0, 0.0);
    lcd.setCursor(11,0);
    lcd.print(waterlevel);
    lcd.setCursor(14,0);
    lcd.print("%");
    tank();
    if(digitalRead(button1) == LOW){
        digitalWrite(buzzer, HIGH);
        mode = !mode;
    }
    if(mode){
        autoMode();
        lcd.setCursor(0,0);
        lcd.print("AUTO  ");
    }
    else {
        manualMode();
        lcd.setCursor(0,0);
        lcd.print("MANUAL");
    }
    modeShift();
    if(!pumpstate){
        digitalWrite(pump, LOW);
        lcd.setCursor(1,1);
        lcd.print("WATER PUMP=OFF");
    }
    else {
        digitalWrite(pump, HIGH);
        lcd.setCursor(1,1);
        lcd.print("WATER PUMP=ON ");
    }
    if(digitalRead(button3) == LOW){
        lcd.backlight();
        delay(3000);
        lcd.noBacklight();
    }
}