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

LiquidCrystal_I2C lcd(0x27, 16, 2);

const int SENSOR_LOW  = 25;
const int SENSOR_MID  = 26;
const int SENSOR_FULL = 27;

const int LED_UNDERFLOW = 2;
const int LED_NORMAL    = 4;
const int LED_OVERFLOW  = 5;

void setup() {
  Serial.begin(115200);

  pinMode(SENSOR_LOW, INPUT_PULLUP);
  pinMode(SENSOR_MID, INPUT_PULLUP);
  pinMode(SENSOR_FULL, INPUT_PULLUP);

  pinMode(LED_UNDERFLOW, OUTPUT);
  pinMode(LED_NORMAL, OUTPUT);
  pinMode(LED_OVERFLOW, OUTPUT);

  lcd.init();
  lcd.backlight();
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("Water Level");
  lcd.setCursor(0,1);
  lcd.print("System Ready");
  delay(1500);
}

void loop() {
  bool low  = !digitalRead(SENSOR_LOW);
  bool mid  = !digitalRead(SENSOR_MID);
  bool full = !digitalRead(SENSOR_FULL);

  digitalWrite(LED_UNDERFLOW, LOW);
  digitalWrite(LED_NORMAL, LOW);
  digitalWrite(LED_OVERFLOW, LOW);

  lcd.clear();

  if (full && mid && low) {
    digitalWrite(LED_OVERFLOW, HIGH);
    lcd.setCursor(0,0);
    lcd.print("Status:");
    lcd.setCursor(0,1);
    lcd.print("OVERFLOW");
  }
  else if (low || mid) {
    digitalWrite(LED_NORMAL, HIGH);
    lcd.setCursor(0,0);
    lcd.print("Status:");
    lcd.setCursor(0,1);
    lcd.print("NORMAL LEVEL");
  }
  else {
    digitalWrite(LED_UNDERFLOW, HIGH);
    lcd.setCursor(0,0);
    lcd.print("Status:");
    lcd.setCursor(0,1);
    lcd.print("UNDERFLOW");
  }

  delay(300);
  
}