#include <EEPROM.h>
#include <LiquidCrystal.h>
#include <DHT.h>

#define DHTPIN 8         // Digital pin connected to the DHT sensor
#define DHTTYPE DHT22    // DHT 22  (AM2302)
DHT dht(DHTPIN, DHTTYPE);

LiquidCrystal lcd(2, 3, 4, 5, 6, 7);

long duration, inches;
int set_val, percentage;
bool state, pump;

const int buzzerPin = 4;    // Buzzer pin
const int ledPin = 13;       // LED pin
const int manualSwitchPin = 10; // Manual/Auto switch pin

void setup() {
  lcd.begin(16, 2);
  lcd.print("WATER LEVEL:");
  lcd.setCursor(0, 1);
  lcd.print("PUMP: OFF MANUAL");

  pinMode(9, OUTPUT);   // Trigger pin for ultrasonic sensor
  pinMode(8, INPUT);    // Echo pin for ultrasonic sensor
  pinMode(buzzerPin, OUTPUT); // Buzzer pin
  pinMode(ledPin, OUTPUT);    // LED pin
  pinMode(manualSwitchPin, INPUT_PULLUP); // Manual/Auto switch pin

  dht.begin(); // Initialize DHT sensor

  set_val = EEPROM.read(0);
  if (set_val > 150) set_val = 150; // Limit set_val to 150 (adjust according to your requirements)
}

void loop() {
  // Water level monitoring
  digitalWrite(9, LOW);
  delayMicroseconds(2);
  digitalWrite(9, HIGH);
  delayMicroseconds(10);
  digitalWrite(9, LOW);
  duration = pulseIn(8, HIGH);
  inches = microsecondsToInches(duration);
  percentage = (set_val - inches) * 100 / set_val;

  lcd.setCursor(12, 0);
  if (percentage < 0) percentage = 0;
  lcd.print(percentage);
  lcd.print("%   ");

  // Pump control
  if (percentage < 30 && digitalRead(manualSwitchPin)) {
    pump = true;
    digitalWrite(buzzerPin, HIGH); // Turn on buzzer
    digitalWrite(ledPin, HIGH);    // Turn on LED
  } else {
    pump = false;
    digitalWrite(buzzerPin, LOW); // Turn off buzzer
    digitalWrite(ledPin, LOW);    // Turn off LED
  }
  digitalWrite(12, pump ? HIGH : LOW); // Control the pump

  // Manual/Auto switch state
  lcd.setCursor(9, 1);
  lcd.print(digitalRead(manualSwitchPin) ? "MANUAL" : "AUTO  ");

  // Save new set_val if manual switch pressed
  if (digitalRead(manualSwitchPin) == LOW && !state) {
    state = true;
    set_val = inches;
    EEPROM.write(0, set_val);
  } else if (digitalRead(manualSwitchPin) == HIGH) {
    state = false;
  }

  // Temperature and humidity monitoring
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();
  
  // Environmental condition alert
  if (temperature >= 30 || humidity >= 70) {
    digitalWrite(buzzerPin, HIGH); // Turn on buzzer
    delay(1000);
    digitalWrite(buzzerPin, LOW); // Turn off buzzer
    delay(1000);
  }
}

long microsecondsToInches(long microseconds) {
  return microseconds / 74 / 2;
}