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

#define DOUT_PIN    32 // HX711 data pin
#define SCK_PIN     33 // HX711 clock pin
#define TRIGGER_PIN 14 // HC-SR04 trigger pin
#define ECHO_PIN    15 // HC-SR04 echo pin
#define I2C_ADDR    0x27 // I2C address of the LCD

LiquidCrystal_I2C lcd(I2C_ADDR, 16, 2);
HX711 scale;

void setup() {
  Serial.begin(9600);
  Wire.begin();
  lcd.init();  
  lcd.backlight(); 

  pinMode(TRIGGER_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);

  scale.begin(DOUT_PIN, SCK_PIN); // Initialize HX711 with pin numbers
  scale.set_scale();
  scale.tare();
}

float readDistance() {
  digitalWrite(TRIGGER_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIGGER_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIGGER_PIN, LOW);
  return pulseIn(ECHO_PIN, HIGH) / 58.0;
}

float calculateBMI(float weight, float height) {
  return weight / (height * height);
}

void loop() {
  float weight = scale.get_units();
  float height = readDistance();
  float bmi = calculateBMI(weight, height);

  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Weight: ");
  lcd.print(weight, 2);
  lcd.print(" kg");

  lcd.setCursor(0, 1);
  lcd.print("Height: ");
  lcd.print(height, 2);
  lcd.print(" cm");

  lcd.setCursor(0, 2);
  lcd.print("BMI: ");
  lcd.print(bmi, 2);

  delay(1000);
}