microSD-millis

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

const int chipSelect = 10;

void setup() {
  Serial.begin(9600);

  Serial.print("Initializing SD card...");

  // see if the card is present and can be initialized:
  if (!SD.begin(chipSelect)) {
    Serial.println("Card failed, or not present");
    while (1);
  }
  Serial.println("card initialized.");
}

void loop() {

  // open the file. note that only one file can be open at a time,
  // so you have to close this one before opening another.
  File dataFile = SD.open("datalog3.txt", FILE_WRITE);

  // if the file is available, write to it:
  if (dataFile) {
    dataFile.print("Este arduino foi ligado a ");
    dataFile.print(millis()/1000);
    dataFile.println(" segundos");
    dataFile.close();

    // print serial port:
    Serial.print("Este arduino foi ligado a ");
    Serial.print(millis()/1000);
    Serial.println(" segundos");

  }else {
    Serial.println("error opening datalog.txt");
  }
  delay(1000);
}