#include <LiquidCrystal_I2C.h>
#include "HX711.h"
#include <NewPing.h> // Include NewPing library

HX711 scale;
LiquidCrystal_I2C LCD(0x27, 16, 2); // Initialize LCD object

const int LOADCELL_DOUT_PIN = 26; // Assuming DOUT pin is connected to analog pin A1
const int LOADCELL_SCK_PIN = 18;  // Assuming SCK pin is connected to GPIO pin 18
const int TRIGGER_PIN = 5; // Trigger pin of ultrasonic sensor connected to GPIO pin 12
const int ECHO_PIN = 19;    // Echo pin of ultrasonic sensor connected to GPIO pin 13
const float loadcell_calibration_factor = -50; // Adjust this value after calibration
const int known_height = 100; // Known height in centimeters (adjust as needed)

NewPing sonar(TRIGGER_PIN, ECHO_PIN); // Initialize NewPing with trigger and echo pins

void setup() {
  Serial.begin(115200);
  delay(10);

  LCD.init();
  LCD.backlight();
  LCD.setCursor(0, 0);
  LCD.print("Initializing...");

  scale.begin(LOADCELL_DOUT_PIN, LOADCELL_SCK_PIN);
  scale.set_scale(loadcell_calibration_factor); // Set the scale factor after calibration

  LCD.clear();
  LCD.setCursor(0, 0);
  LCD.print("Load Cell Ready");

  Serial.begin(9600);
  Serial.println("Initializing the scale");
  scale.begin(LOADCELL_DOUT_PIN, LOADCELL_SCK_PIN);
}

void loop() {
  // Read weight from load cell
  float loadcell_raw_reading = scale.get_units(10); // Read the load cell value in grams
  float loadcell_kg_reading = loadcell_raw_reading / 1000.0; // Convert the reading to kilograms

  // Read distance from ultrasonic sensor
  unsigned int distance = sonar.ping_cm();

  // Calculate height
  int height = known_height - distance;

  // Calculate BMI
  float height_m = height / 100.0; // Convert height to meters
  float bmi = loadcell_kg_reading / (height_m * height_m); // Calculate BMI

  // Display readings on LCD
  LCD.clear();
  LCD.setCursor(0, 0);
  LCD.print("Weight: ");
  LCD.print(loadcell_kg_reading, 2); // Display the weight in kilograms on LCD with two decimal places
  LCD.print(" kg");

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

  LCD.setCursor(0, 2);
  LCD.print("BMI: ");
  LCD.print(bmi, 2); // Display BMI with two decimal places

  // Print readings to Serial Monitor
  Serial.print("Weight (kg): ");
  Serial.println(loadcell_kg_reading, 2); // Print the weight in kilograms to Serial Monitor

  Serial.print("Height: ");
  Serial.print(height);
  Serial.println(" cm");

  Serial.print("BMI: ");
  Serial.println(bmi, 2); // Print BMI to Serial Monitor

  delay(1000);
}