Writing year on an SD card issue - DS3231 and SDFat

Projects Programming
1

Hi everyone,

I am working on a datalogger device. Currently I am trying to just write a timestamp into a textfile.

HW: Arduino Nano Every, DS3231, MicroSD Card Adapter with a microSD card

Every single thing by itself works, but when I try to write year on the sd card only a square is in the file. I have no clue what could be wrong, as the year is normal when wirtten over the serial communication.

Serial monitor: 24-4-18 14:25:44
SD card: []-4-18 14:25:44 (The square brackets represent the square symbol)

I don't understand how the rest of the date can be correct, while the year is messed up.



#include <DS3231.h>
#include <Wire.h>
#include <BufferedPrint.h>
#include <FreeStack.h>
#include <MinimumSerial.h>
#include <RingBuf.h>
#include <SdFat.h>
#include <SdFatConfig.h>
#include <sdios.h>

//------------------------------------------------------------------------------
// File system object.
SdFat sd;

// Log file.
SdFile file;
DS3231 myRTC;

//RTC setup
bool century = true;
bool h12Flag;
bool pmFlag;

//PIN setup
const byte LED_pin = 2;
const byte SD_pin = 4;
uint32_t t = 0;

void logDate() {

  // Write data to file.  Start with log time in micros.

  // Write ADC data to CSV record.
  file.write("");
  file.write(myRTC.getYear());
  file.print("-");
  file.print(myRTC.getMonth(century));
  file.print("-");
  file.print(myRTC.getDate());
  file.print(" ");
  file.print(myRTC.getHour(h12Flag, pmFlag)); //24-hr
  file.print(":");
  file.print(myRTC.getMinute());
  file.print(":");
  file.print(myRTC.getSecond());
  file.println("");

  file.sync();

}

void setup() {
  // initialize serial communication at 9600 bits per second:
  Serial.begin(9600);
  Wire.begin();
  pinMode(LED_pin,OUTPUT);

  // SDcart setup?
  if (!sd.begin(SD_pin)|| !file.open("DATA.CSV", O_CREAT | O_WRITE | O_APPEND)) {
  // Replace this with somthing for your app.
  }
}

// the loop routine runs over and over again forever:
void loop() {
  // return date
  
  digitalWrite(LED_pin,HIGH);
  Serial.print(myRTC.getYear());
  Serial.print("-");
  Serial.print(myRTC.getMonth(century), DEC);
  Serial.print("-");
  Serial.print(myRTC.getDate(), DEC);
  Serial.print(" ");
  Serial.print(myRTC.getHour(h12Flag, pmFlag), DEC); //24-hr
  Serial.print(":");
  Serial.print(myRTC.getMinute(), DEC);
  Serial.print(":");
  Serial.println(myRTC.getSecond(), DEC);
  if(millis()>t){
    //Write date
    logDate();
    Serial.println("SD card operation");
    t+=60000;
  }

  
  delay(1000);  // delay in between reads for stability
  digitalWrite(LED_pin,LOW);
  delay(4000);
}

Don't mind the blinking LED, it's there as a sanity check (+learning to use a transistor).

Thanks for any suggestions.

2

.write() and .print() are different.

.write() writes data in binary, not text format.

.print() writes in text format.

1 Like
3

Thank you,

I knew it was something simple. This fixed it.

4

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