#include <HX711.h>
const int pinDOUT = 2;
const int pinSCK = 4;
HX711 scale;

#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27,16,2);

const int buzzer = 5;

void setup() {
  Serial.begin(115200);
  scale.begin(pinDOUT,pinSCK);
  scale.set_scale(4.2);
  scale.tare();

  lcd.init();
  lcd.backlight();

  pinMode(buzzer,OUTPUT);
}

void loop() {
  if(scale.is_ready()) {
    long reading = scale.get_units(10);
    float kg_sample = float(reading) / 100;
    float kg_lcd = kg_sample + 8;
    Serial.print("BERAT OBJEK: ");
    Serial.print(kg_sample,2);
    Serial.println(" KG");
    Serial.print("LAYAR TAMPILAN: ");
    Serial.print(kg_lcd,2);
    Serial.println(" KG");

    lcd.setCursor(0,0);
    lcd.print("BERAT BEBAN");
    lcd.setCursor(0,1);
    lcd.print(String(kg_lcd,2) + " KG ");

    if(kg_lcd > 29) {
      tone(buzzer,200);
      delay(200);
      tone(buzzer,400);
      delay(100);
    }
    else {
      tone(buzzer,0);
    }
  }
  delay(100);
}