#include <LiquidCrystal.h>
#include <HX711.h>

#define echoPin 7 // Ultrasonic Sensor Echo pin
#define trigPin 8 // Ultrasonic Sensor Trigger pin
#define DOUT  3   // HX711 circuit wiring
#define CLK  2    // HX711 circuit wiring
#define calibration_factor 210000 // Calibration factor for load cell

LiquidCrystal lcd(12, 11, 5, 4, 3, 2); // LCD pins

HX711 scale;

void setup() {
  Serial.begin(9600);
  lcd.begin(16, 2);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  scale.begin(DOUT, CLK);
  scale.set_scale(calibration_factor);
}

void loop() {
  long duration, distance;
  
  // Ultrasonic sensor readings
  digitalWrite(trigPin, LOW); 
  delayMicroseconds(2); 
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10); 
  digitalWrite(trigPin, LOW);
  duration = pulseIn(echoPin, HIGH);
  distance = (duration / 2) / 29.1;
  
  // HX711 load cell readings
  scale.tare();
  float weight = scale.get_units();
  
  // Display readings on LCD
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("Distance: ");
  lcd.print(distance);
  lcd.print(" cm");
  lcd.setCursor(0, 1);
  lcd.print("Weight: ");
  lcd.print(weight);
  lcd.print(" g");
  
  delay(500);
}