#include <HX711.h>
#include <ESP32Servo.h>  

#define calibration_factor 3196.6  //Calibrated for kg

// Define the GPIO pins for ESP32
#define LOADCELL_DOUT_PIN  6   
#define LOADCELL_SCK_PIN   7  

Servo s1;  // Servo object
float val = 0;

HX711 scale;

void setup() {
  Serial.begin(9600);
  Serial.println("HX711 scale demo");

  s1.attach(18); 
  s1.write(90);  // Move the servo to the initial position

  scale.begin(LOADCELL_DOUT_PIN, LOADCELL_SCK_PIN);
  scale.set_scale(calibration_factor);  // Set the calibration factor for kilograms
  scale.tare();  // Reset the scale to 0, assuming no weight on it

  Serial.println("Readings:");
}

void loop() {
  Serial.print("Reading: ");
  val = scale.get_units();  // Get the weight in kilograms 
  Serial.print(val);
  Serial.print(" kg");
  Serial.println();

  if (val < 0.2) //Turns motor if bowl is nearly empty
  {
    s1.write(90);  // Move servo to 90 degrees if weight is low
    delay(2000);
  }
  else
  {
    s1.write(0);  // Move servo back to 0 degrees to prevent over filling
  }
}