#include <HX711.h>

HX711 scale;

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

float weight;

void setup() {
  Serial.begin(9600);
  scale.begin(LOADCELL_DOUT_PIN, LOADCELL_SCK_PIN);
  scale.set_scale();
  scale.tare();
}

void loop() {
  weight = scale.get_units();
  if (weight >= 4.0) {
    Serial.println("Weight is 4kg or more");
  }
  delay(100);
}