#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <RTClib.h>
#include "HX711.h"

// Initialize the RTC
RTC_DS3231 rtc;

// Initialize the LCD (ganti 0x27 dengan alamat I2C yang ditemukan dari scan)
LiquidCrystal_I2C lcd(0x27, 16, 2); 

// Initialize the HX711
#define LOADCELL_DOUT_PIN  21
#define LOADCELL_SCK_PIN  22
HX711 scale;

// Buzzer pin
const int buzzer = 18;

// Set the weight threshold for empty
const float weightThreshold = 10.0; // Adjust this value as needed

void setup() {
  // Start serial communication
  Serial.begin(115200);

  // Initialize the LCD
  lcd.begin(16, 2);  // Add the number of columns and rows
  lcd.backlight();
  
  // Initialize the RTC
  if (!rtc.begin()) {
    lcd.print("Couldn't find RTC");
    while (1);
  }
  if (rtc.lostPower()) {
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  }

  // Initialize the HX711
  scale.begin(LOADCELL_DOUT_PIN, LOADCELL_SCK_PIN);
  scale.set_scale(); 
  scale.tare();

  // Initialize the buzzer pin as an output
  pinMode(buzzer, OUTPUT);
}

void loop() {
  // Get current time
  DateTime now = rtc.now();
  
  // Get the weight from the load cell
  float weight = scale.get_units(10);

  // Display the weight on the LCD
  lcd.setCursor(0, 0);
  lcd.print("Weight: ");
  lcd.print(weight, 1);
  lcd.print(" g");

  // Check if the weight is below the threshold
  if (weight < weightThreshold) {
    // Sound the buzzer
    digitalWrite(buzzer, HIGH);
    
    // Display empty warning on the LCD
    lcd.setCursor(0, 1);
    lcd.print("Feed box empty!");
  } else {
    // Turn off the buzzer
    digitalWrite(buzzer, LOW);
    
    // Display the current time
    lcd.setCursor(0, 1);
    lcd.print("Time: ");
    lcd.print(now.hour(), DEC);
    lcd.print(':');
    lcd.print(now.minute(), DEC);
    lcd.print(':');
    lcd.print(now.second(), DEC);
  }

  // Delay for a second
  delay(1000);
}