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

#define I2C_ADDR    0x27
#define LCD_COLUMNS 20
#define LCD_LINES   4
#define SPEAKER_PIN 8

HX711 scale;

LiquidCrystal_I2C lcd(I2C_ADDR, LCD_COLUMNS, LCD_LINES);

void setup() {
  // Init
  Serial.begin(9600);
  Serial.println("Initializing the scale");
  scale.begin(A1, A0);
  lcd.init();
  lcd.backlight();
  pinMode(SPEAKER_PIN, OUTPUT);
}

void loop() {
  float x;
  x = scale.get_units()/420;
  Serial.println(scale.get_units()/420, 2);
  delay(1000);
  lcd.setCursor(7, 1);
  lcd.print("Weight");
  lcd.setCursor(6, 2);
  lcd.print(x);
  lcd.setCursor(12, 2);
  lcd.print("kg");
  if (x<2) 
  {
    tone(SPEAKER_PIN, x);
  }
  else 
  {
    noTone(SPEAKER_PIN);
  }
}