#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include "HX711.h"

#define OLED_SDA   21
#define OLED_SCL   22

#define HX_DT      26
#define HX_SCK     27

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_ADDR 0x3C

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);
HX711 scale;

float calibration_factor = 420.0;
float weightKg = 0.0;
float weightG = 0.0;

void iniciarHX711() {
  scale.begin(HX_DT, HX_SCK);
  scale.set_scale(calibration_factor);
  scale.tare();
}

void leerPeso() {
  float w = scale.get_units(5);
  if (w < 0) w = 0;
  weightKg = w;
  weightG = w * 1000.0;
}

void mostrarOLED() {
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 0);

  display.println("Simulacion peso");
  display.println("----------------");
  display.print("Peso: ");
  display.print(weightKg, 2);
  display.println(" kg");

  display.print("Peso: ");
  display.print(weightG, 0);
  display.println(" g");

  display.display();
}

void setup() {
  Serial.begin(115200);

  Wire.begin(OLED_SDA, OLED_SCL);
  display.begin(SSD1306_SWITCHCAPVCC, OLED_ADDR);

  iniciarHX711();
}

void loop() {
  leerPeso();
  mostrarOLED();

  Serial.print("Peso: ");
  Serial.print(weightKg, 2);
  Serial.println(" kg");

  delay(800);
}