Automatic Pet Feeder with Arduino

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

RTC_DS3231 rtc;
Servo feeder;

// Feeding times (24-hour format)
int feedingHours[] = {8, 18};
int feedingMinute = 0;

bool fedToday[2] = {false, false};

void setup() {
  Serial.begin(9600);
  
  if (!rtc.begin()) {
    Serial.println("RTC not found!");
    while (1);
  }
  
  // Set time if RTC lost power
  // rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  
  feeder.attach(9);
  feeder.write(0);
  
  Serial.println("Pet Feeder Ready");
}

void loop() {
  DateTime now = rtc.now();
  
  Serial.print("Time: ");
  Serial.print(now.hour());
  Serial.print(":");
  Serial.println(now.minute());
  
  // Check each feeding time
  for (int i = 0; i < 2; i++) {
    if (now.hour() == feedingHours[i] && 
        now.minute() == feedingMinute && 
        !fedToday[i]) {
      
      Serial.println("Feeding time!");
      dispenseFood();
      fedToday[i] = true;
    }
    
    // Reset fed status at midnight
    if (now.hour() == 0 && now.minute() == 0) {
      fedToday[i] = false;
    }
  }
  
  delay(30000);
}

void dispenseFood() {
  Serial.println("Dispensing food...");
  
  feeder.write(90);
  delay(1000);
  
  feeder.write(0);
  delay(1000);
  
  Serial.println("Food dispensed!");
}

Adjust feeding times in feedingHours array. Default: 8 AM and 6 PM.