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

LiquidCrystal_I2C lcd(0x27, 16, 2);

const int trigPin = 2;
const int echoPin = 3;

#define DOUT_PIN 4
#define SCK_PIN 5

HX711 scale;

long duration;
float distanceInCm;
float distanceInFeet;
float heigth;

void setup()
{
  Serial.begin(9600);

  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  
  lcd.begin(20, 4);
  lcd.backlight();
  
  scale.begin(DOUT_PIN, SCK_PIN);
}

void loop()
{
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  duration = pulseIn(echoPin, HIGH);

  float distanceInCm = duration * 0.034 / 2;

  // Convert distance to meters
  float distanceInMeters = distanceInCm / 100.0;
  float height = distanceInMeters - 2.7432;
  float pHeight = abs(height);
  
  long rawValue = scale.read();

  float calibratedValue = rawValue / 420.0;
  float bmi = calibratedValue  / (height*height);

  lcd.setCursor(0, 0);
  lcd.print("Height: ");
  lcd.print(pHeight);
  lcd.print("m");

  lcd.setCursor(0,1);
  lcd.print("Weight: ");
  lcd.print(calibratedValue);
  lcd.print("kg");

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