/*
  Wokwi | questions
  Hi! Can't find what's wrong here, need help.
  rs October 10, 2025— 11:09 AM
  Project Link: https://wokwi.com/projects/444164113858721793?gh=1
*/

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <Adafruit_MPU6050.h>
#include <Adafruit_Sensor.h>

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 32
#define OLED_RESET -1

const int LDR_PIN = A0;
const int PIR_PIN = 2;
const int ECHO_PIN = 3;
const int TRIG_PIN = 4;
const int LUZ_UMBRAL_BAJO = 100;
const int LUZ_UMBRAL_ALTO = 900;
const int DISTANCIA_UMBRAL = 20;
const unsigned long DEBOUNCE_DELAY_PIR = 50;
const float MOVIMIENTO_UMBRAL = 1.5;

float prevAccX = 0, prevAccY = 0, prevAccZ = 0;
unsigned long lastDebounceTimePIR = 0;

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
Adafruit_MPU6050 mpu;

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

  display.setRotation(2); // flips screen vertically
  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println(F("SSD1306 falló"));
    for (;;);
  }
  display.display();
  delay(2000);
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(0, 0);
  display.print("Iniciando...");
  display.display();
  delay(1000);

  if (!mpu.begin()) {
    Serial.println("Fallo al encontrar el MPU6050");
    while (1) {
      delay(10);
    }
  }
  Serial.println("MPU6050 encontrado!");
  mpu.setAccelerometerRange(MPU6050_RANGE_8_G);
  mpu.setGyroRange(MPU6050_RANGE_500_DEG);
  mpu.setFilterBandwidth(MPU6050_BAND_21_HZ);

  pinMode(PIR_PIN, INPUT);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);

  sensors_event_t a, g, temp;
  mpu.getEvent(&a, &g, &temp);

  prevAccX = a.acceleration.x;
  prevAccY = a.acceleration.y;
  prevAccZ = a.acceleration.z;
}

void loop() {

    //Serial.println("Got here!");

  display.clearDisplay();
  display.setCursor(0, 0);
  display.print("Monitoreando...");
  display.display();

  sensors_event_t a, g, temp;
  mpu.getEvent (&a, &g, &temp);

  float accX = a.acceleration.x;
  float accY = a.acceleration.y;
  float accZ = a.acceleration.z;

  float deltaAcc = abs(accX - prevAccX) + abs(accY - prevAccY) + abs(accZ - prevAccZ);

  if (deltaAcc > MOVIMIENTO_UMBRAL) {
    display.print("ALERTA: Movimiento Brusco!");
    display.display();
  }

}