#include "HX711.h"

const int LOADCELL_DOUT_PIN = 3;
const int LOADCELL_SCK_PIN = 2;

HX711 scale;
float calibration_factor = 8000; // Start with a rough guess
float known_weight = 3.0; // Your known weight (in kg)
float tolerance = 0.05; // Acceptable error margin

void setup() {
  Serial.begin(9600);
  scale.begin(LOADCELL_DOUT_PIN, LOADCELL_SCK_PIN);
  
  Serial.println("HX711 Calibration");
  
  scale.set_scale();
  scale.tare(); // Reset scale to zero

  Serial.println("Starting automatic calibration...");
}

void loop() {
  // Adjust the calibration factor
  scale.set_scale(calibration_factor); 
  
  // Get weight reading
  float weight = scale.get_units();
  Serial.print("Current Reading: ");
  Serial.print(weight);
  Serial.print(" kg  |  Calibration factor: ");
  Serial.println(calibration_factor);
  
  // Automatically adjust calibration factor to match the known weight
  if (weight < known_weight - tolerance) {
    calibration_factor += 10; // Increase calibration factor
  } else if (weight > known_weight + tolerance) {
    calibration_factor -= 10; // Decrease calibration factor
  } else {
    Serial.println("Calibration complete.");
    while(1); // Stop the program when calibration is done
  }

  delay(500);
}