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

// Initialize the LCD with the I2C address (e.g., 0x27) and display size (16x2)
LiquidCrystal_I2C lcd(0x27, 16, 2);

// Pins for Ultrasonic Sensor
const int trigPin = 9;
const int echoPin = 10;

float bodyMass;
float height;
float bmi;

void setup() {
  Serial.begin(115200);
  Serial.print("hello");
  // Serial.begin(9600);

  // Initialize the LCD
lcd.init();
lcd.backlight();

  // Initial LCD message
  lcd.print("Enter Mass:");
  lcd.setCursor(0, 1);
  lcd.print("kg: ");
}

void loop() {
  // Get body mass from Serial
  if (Serial.available() > 0) {
    bodyMass = Serial.parseFloat();
    lcd.clear();
    lcd.print("Mass: ");
    lcd.print(bodyMass);
    lcd.print(" kg");

    // Measure height
    height = measureHeight();
    lcd.setCursor(0, 1);
    lcd.print("Height: ");
    lcd.print(height, 2);
    lcd.print(" m");

    // Calculate BMI
    bmi = bodyMass / (height * height);

    delay(2000);
    lcd.clear();
    lcd.print("BMI: ");
    lcd.print(bmi, 2);
    delay(3000);
  }
}

float measureHeight() {
  long duration;
  float distance;

  // Send a 10 microsecond pulse to trigger pin
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  // Read the echo pin
  duration = pulseIn(echoPin, HIGH);

  // Convert duration to height in meters
  distance = duration * 0.0001715;  // meters

  return distance;
}