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

// 
#define LOADCELL_DOUT_PIN  3
#define LOADCELL_SCK_PIN  2
#define SERVO_PIN 5

// Defining variables, components
LiquidCrystal_I2C lcd(0x27, 16, 2);
HX711 loadcell;
Servo servo;
// int angle;
// float weight;

void setup() {
  // Serial data rate 9600
  Serial.begin(9600);
  // Initialise LCD
  lcd.init();
  lcd.backlight();
  lcd.cursor();
  // Init load cell hx711
  loadcell.begin(LOADCELL_DOUT_PIN, LOADCELL_SCK_PIN);
  loadcell.set_scale(420); // set the calibration factor (this will depend on your load cell)
  // Attach servo pin 5
  servo.attach(5);
}

void loop() {
  // Get weight from hx 711 load cell
  float weight = loadcell.get_units();
  // map the weight range to the servo angle range
  int angle = map(weight, 0, 5.0, 0, 180); 
  // Servo move to weight
  servo.write(angle);
  // Write weight to LCD
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("Weight: ");
  lcd.print(weight);
  lcd.print(" kg");
  // Delay of 500 ms
  delay(500);
}