motor logger.ino

#include <Wire.h>
#include <RTClib.h>
#include <SD.h>
#include <SPI.h>

#define SD_CS_PIN   10
#define BUTTON_PIN  2

RTC_DS3231 rtc;
File file;

bool lastButtonState = HIGH;
unsigned long pressStartTime = 0;

uint16_t dailyCount = 0;
uint8_t lastDay = 0;

const char filename[] = "eventos.csv";

// =====================
// Guardar evento en SD
// =====================
void saveEvent(DateTime now, unsigned long durationMs) {
  Serial.println(F("[SD] Abriendo archivo para escritura"));

  file = SD.open(filename, FILE_WRITE);
  if (!file) {
    Serial.println(F("[ERROR] No se pudo abrir el archivo"));
    return;
  }

  Serial.println(F("[SD] Escribiendo evento"));

  file.print(now.year()); file.print("-");
  if (now.month() < 10) file.print("0");
  file.print(now.month()); file.print("-");
  if (now.day() < 10) file.print("0");
  file.print(now.day()); file.print(",");

  if (now.hour() < 10) file.print("0");
  file.print(now.hour()); file.print(":");
  if (now.minute() < 10) file.print("0");
  file.print(now.minute()); file.print(":");
  if (now.second() < 10) file.print("0");
  file.print(now.second()); file.print(",");

  file.print("PRESIONADO,");
  file.print(durationMs);
  file.print(" ms,conteo_dia=");
  file.println(dailyCount);

  file.close();
  Serial.println(F("[SD] Evento guardado correctamente"));
}

// ===========================
// Cargar último estado guardado
// ===========================
void loadLastState() {
  Serial.println(F("[SD] Cargando último estado"));

  file = SD.open(filename, FILE_READ);
  if (!file) {
    Serial.println(F("[SD] Archivo no existe, se creará"));
    return;
  }

  String line;
  while (file.available()) {
    line = file.readStringUntil('\n');

    int idx = line.indexOf("conteo_dia=");
    if (idx != -1) {
      dailyCount = line.substring(idx + 11).toInt();
      lastDay = line.substring(8, 10).toInt(); // DD
    }
  }

  file.close();

  Serial.print(F("[SD] Último conteo diario: "));
  Serial.println(dailyCount);
  Serial.print(F("[SD] Último día registrado: "));
  Serial.println(lastDay);
}

void setup() {
  Serial.begin(9600);
  Serial.println(F("[INIT] Iniciando sistema"));

  pinMode(BUTTON_PIN, INPUT_PULLUP);

  // RTC DS3231
  Serial.println(F("[RTC] Inicializando DS3231"));
  Wire.begin();
  if (!rtc.begin()) {
    Serial.println(F("[ERROR] DS3231 no detectado"));
    while (1);
  }

  if (rtc.lostPower()) {
    Serial.println(F("[RTC] Pérdida de energía detectada, ajustando hora"));
    rtc.adjust(DateTime(F(__DATE__), F(__TIME__)));
  }

  // SD
  Serial.println(F("[SD] Inicializando SD"));
  if (!SD.begin(SD_CS_PIN)) {
    Serial.println(F("[ERROR] Fallo al inicializar SD"));
    while (1);
  }
  Serial.println(F("[SD] SD inicializada"));

  loadLastState();

  DateTime now = rtc.now();
  if (now.day() != lastDay) {
    Serial.println(F("[INFO] Día nuevo detectado, reiniciando contador"));
    dailyCount = 0;
    lastDay = now.day();
  }

  Serial.println(F("[INIT] Sistema listo"));
}

void loop() {
  bool buttonState = digitalRead(BUTTON_PIN);
  DateTime now = rtc.now();

  // Cambio de día
  if (now.day() != lastDay) {
    Serial.println(F("[INFO] Cambio de día detectado"));
    dailyCount = 0;
    lastDay = now.day();
  }

  // Botón presionado
  if (lastButtonState == HIGH && buttonState == LOW) {
    pressStartTime = millis();
    Serial.println(F("[BOTON] Presionado"));
  }

  // Botón liberado
  if (lastButtonState == LOW && buttonState == HIGH) {
    unsigned long duration = millis() - pressStartTime;
    dailyCount++;

    Serial.print(F("[BOTON] Liberado | Duración: "));
    Serial.print(duration);
    Serial.print(F(" ms | Conteo diario: "));
    Serial.println(dailyCount);

    saveEvent(now, duration);
  }

  lastButtonState = buttonState;
}