#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 buttonPin = 7;
bool lastButtonState = HIGH;

void setup() {
  Serial.begin(115200);
  scale.begin(pinDOUT, pinSCK);
  scale.set_scale(0.42);  // Sesuaikan setelah kalibrasi
  scale.tare();           // Nolkan berat awal

  pinMode(buttonPin, INPUT_PULLUP);  // Tombol aktif LOW

  lcd.init();
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("Timbangan Nutrisi");
  delay(1500);
  lcd.clear();
}

void loop() {
  // Tombol untuk tare
  bool currentButtonState = digitalRead(buttonPin);
  if (currentButtonState == LOW && lastButtonState == HIGH) {
    scale.tare();
    lcd.clear();
    lcd.setCursor(0, 0);
    lcd.print("Tare... 0g");
    delay(800);
  }
  lastButtonState = currentButtonState;

  if (scale.is_ready()) {
    float gram = scale.get_units(3);  // hasil dalam gram
    if (gram < 0) gram = 0;

    float kalori = gram * 2.0;

    Serial.print("Berat: ");
    Serial.print(gram, 1);
    Serial.print(" g | Kalori: ");
    Serial.println(kalori, 1);

    lcd.setCursor(0, 0);
    lcd.print("Berat: ");
    lcd.print(gram, 1);
    lcd.print(" g   "); // spasi untuk hapus sisa

    lcd.setCursor(0, 1);
    lcd.print("Kalori: ");
    lcd.print(kalori, 1);
    lcd.print(" kcal ");
  }

  delay(200);
}