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

LiquidCrystal_I2C lcd(0x27, 16, 2); 

#define DOUT  2 // Pin DT HX711
#define CLK  3  // Pin SCK HX711

#define BUZZER_PIN 8 // Pin Buzzer
#define LED_PIN 5    // Pin LED

HX711 scale;

void setup() {
  Serial.begin(9600); 
  scale.begin(DOUT, CLK); 
  scale.set_scale(); 

  pinMode(BUZZER_PIN, OUTPUT); 
  pinMode(LED_PIN, OUTPUT);    
  lcd.init();                     
  lcd.backlight();      
  lcd.init();
  lcd.backlight(); 
  lcd.setCursor(1,0);
  lcd.print("SENSOR BEBAN");
  lcd.setCursor(0,1);
  lcd.print(" REVIADY ");
  delay(3000);
  
}

void loop() {
  scale.set_scale(); 
  float berat = scale.get_units(10) / 420.00; 
  lcd.clear();          
  lcd.setCursor(0, 0);
  lcd.print("Alat Timbangan");
  lcd.setCursor(0, 1);
  lcd.print("Berat: "); 
  lcd.setCursor(12, 1);
  lcd.print("Kg");
  lcd.setCursor(7, 1);
  lcd.print(berat, 2); 

  if (berat > 30) { 
    digitalWrite(BUZZER_PIN, HIGH); 
    digitalWrite(LED_PIN, HIGH);    
    tone(8, 1200, 250); 
    delay(250); 
    digitalWrite(LED_PIN, LOW); 
    delay(250); 
  } else {
    digitalWrite(BUZZER_PIN, LOW); 
    digitalWrite(LED_PIN, LOW);    
    noTone(8); 
  }

  delay(1000); 
}