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

RTC_DS3231 rtc;

Servo foodServo;
int trigPin = 2;    // Ultrasonic sensor trigger pin (connected to digital pin 2)
int echoPin = 3;    // Ultrasonic sensor echo pin (connected to digital pin 3)
int buzzerPin = 4;  // Buzzer connected to digital pin 4
int ledPin = 13;    // Optional LED for visual indication

void setup() {
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  pinMode(buzzerPin, OUTPUT);
  pinMode(ledPin, OUTPUT);
  foodServo.attach(9); // Attach servo to pin 9

  Wire.begin();
  rtc.begin();
  // Uncomment the next line and set the RTC time if needed:
  // rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
}

void loop() {
  DateTime now = rtc.now();

  // Check for scheduled feeding times (e.g., 8:00 AM and 6:00 PM)
  if ((now.hour() == 8 && now.minute() == 0) || (now.hour() == 21 && now.minute() == 03)) {
    digitalWrite(buzzerPin, HIGH);
    tone(buzzerPin, 1000); // Play a tone of 1000 Hz
    digitalWrite(ledPin, HIGH); // Turn on LED
    delay(5000); // Buzzer sound for 5 second
    digitalWrite(buzzerPin, LOW);
    noTone(buzzerPin); // Stop the tone
    digitalWrite(ledPin, LOW); // Turn off LED

    // Wait for a brief moment to allow the pet to approach
    delay(5000); // 5 seconds delay for pet to approach

    // Check presence using ultrasonic sensor
    digitalWrite(trigPin, HIGH);
    delayMicroseconds(10);
    digitalWrite(trigPin, LOW);
    long duration = pulseIn(echoPin, HIGH);
    long distance = duration * 0.0343 / 2;

    if (distance < 20) {  // Adjust the threshold distance as needed
      // Dispense food using the servo
      foodServo.write(90); // Rotate servo to middle position
      delay(1000);         // Wait for food to be dispensed
      foodServo.write(0);  // Return servo to initial position
      delay(1000);         // Delay before checking again
    }
  }

  // Add a delay to avoid continuous checking
  delay(60000); // Check every minute (adjust as needed)
}