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

#define irSensorPetPin 2 // Pin for detecting pet presence
#define irSensorFoodPin 3 // Pin for detecting food level
#define redLedPin 11
#define greenLedPin 12
#define servoPin 9

LiquidCrystal_I2C lcd(0x27, 16, 2); // Set the LCD address to 0x27 for a 16 chars and 2 line display
Servo myServo;

unsigned long previousDispenseTime = 0;
const unsigned long dispenseInterval = 86400000; // Dispense food every 24 hours (in milliseconds)

bool foodDispensed = false;

void setup() {
  pinMode(irSensorPetPin, INPUT);
  pinMode(irSensorFoodPin, INPUT);
  pinMode(redLedPin, OUTPUT);
  pinMode(greenLedPin, OUTPUT);

  // Set the initial state of the food level sensor pin to HIGH
  digitalWrite(irSensorFoodPin, HIGH);

  lcd.begin(16, 2); // initialize the LCD
  lcd.backlight(); // Turn on the backlight
}

void loop() {
  // Read pet presence sensor
  int petPresence = digitalRead(irSensorPetPin);
  // Read food level sensor
  int foodLevel = digitalRead(irSensorFoodPin);

  // Get current time
  unsigned long currentTime = millis();

  // Check if it's time to dispense food and the pet is present
  if (currentTime - previousDispenseTime >= dispenseInterval && petPresence == HIGH) {
    dispenseFood();
    previousDispenseTime = currentTime; // Update previousDispenseTime
  }

  // Update LCD and LED based on pet presence and food level
  updateDisplay(petPresence, foodLevel);

  delay(1000); // Delay for stability
}

void dispenseFood() {
  myServo.attach(servoPin);
  myServo.write(90); // Open the feeder
  delay(2000); // Wait for food to dispense
  myServo.write(0); // Close the feeder
  myServo.detach(); // Detach servo after feeding
}

void updateDisplay(int petPresence, int foodLevel) {
  if (petPresence == HIGH) {
    digitalWrite(redLedPin, LOW);
    digitalWrite(greenLedPin, HIGH);
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Pet is present");
    foodDispensed = false; // Reset foodDispensed flag if pet is present
  } else {
    digitalWrite(redLedPin, HIGH);
    digitalWrite(greenLedPin, LOW);
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Pet not present");
  }

  if (foodLevel == LOW) {
    digitalWrite(redLedPin, LOW);
    digitalWrite(greenLedPin, HIGH);
    lcd.clear();
    lcd.setCursor(0, 1);
    lcd.print("Low food level");
  } else {
    digitalWrite(redLedPin, HIGH);
    digitalWrite(greenLedPin, LOW);
    lcd.clear();
    lcd.setCursor(0, 1);
    lcd.print("Food level OK");
  }
}