Rtc Ds1307 Clock Mini And MicroSd Module Shield For Wemos D1Mini

SPECIFICATIONS:

 >   SD card type                   :microSD

 >   Supported file system  :FAT16 or FAT32

 >   Backup battery type     :CR1220

OVERVIEW:

 -With this Data Log Shield for WiFi D1 Mini board, can saving data to files on any FAT16 or FAT32 formatted MicroSD card.

 -The included RTC (Real Time Clock) can be used to timestamp all your data with the current time, so that you know precisely what happened when!

 -SD card interface works with FAT16 or FAT32 formatted cards.

 -Real time clock (RTC) keeps the time going even when the power disconnected. The coin cell battery backup last date and time.

 -RTC protected from wrong connecting of battery.

PACKAGE INCLUDES:

   1 PCS x  Rtc Ds1307 Clock Mini And Micro

      Sd Module Shield For Wemos D1 - Mini.

   >  https://www.maximintegrated.com/en/products/analog/real-time-clocks/DS1307.html

//SOURCE CODE TAKEN FROM BELOW LINK

//https://github.com/wemos/D1_mini_Examples/blob/master/examples/04.Shields/Micro_SD_Shield/CardInfo/CardInfo.ino

/*

 * Micro SD Shield - Card info

 *

 * This example shows how use the utility libraries on which the'

 * SD library is based in order to get info about your SD card.

 * Very useful for testing a card when you're not sure whether its working or not.

 *

 *

 * The SD card library uses 8.3 format filenames and is case-insensitive.

 * eg. IMAGE.JPG is the same as image.jpg

 *

 * created  28 Mar 2011 by Limor Fried

 * modified 9 Apr 2012 by Tom Igoe

 *

 * This example code is in the public domain.

 * https://github.com/esp8266/Arduino/blob/master/libraries/SD/examples/CardInfo/CardInfo.ino

 */

// include the SD library:

#include <SPI.h>

#include <SD.h>

// set up variables using the SD utility library functions:

Sd2Card card;

SdVolume volume;

SdFile root;

// change this to match your SD shield or module;

// WeMos Micro SD Shield V1.0.0: D8

// LOLIN Micro SD Shield V1.2.0: D4 (Default)

const int chipSelect = D4;

void setup()

{

  // Open serial communications and wait for port to open:

  Serial.begin(9600);

  while (!Serial) {

    ; // wait for serial port to connect. Needed for Leonardo only

  }

  Serial.print("\nInitializing SD card...");

  // we'll use the initialization code from the utility libraries

  // since we're just testing if the card is working!

  if (!card.init(SPI_HALF_SPEED, chipSelect)) {

    Serial.println("initialization failed. Things to check:");

    Serial.println("* is a card inserted?");

    Serial.println("* is your wiring correct?");

    Serial.println("* did you change the chipSelect pin to match your shield or module?");

    return;

  } else {

    Serial.println("Wiring is correct and a card is present.");

  }

  // print the type of card

  Serial.print("\nCard type: ");

  switch (card.type()) {

    case SD_CARD_TYPE_SD1:

      Serial.println("SD1");

      break;

    case SD_CARD_TYPE_SD2:

      Serial.println("SD2");

      break;

    case SD_CARD_TYPE_SDHC:

      Serial.println("SDHC");

      break;

    default:

      Serial.println("Unknown");

  }

  // Now we will try to open the 'volume'/'partition' - it should be FAT16 or FAT32

  if (!volume.init(card)) {

    Serial.println("Could not find FAT16/FAT32 partition.\nMake sure you've formatted the card");

    return;

  }

  // print the type and size of the first FAT-type volume

  uint32_t volumesize;

  Serial.print("\nVolume type is FAT");

  Serial.println(volume.fatType(), DEC);

  Serial.println();

  volumesize = volume.blocksPerCluster();    // clusters are collections of blocks

  volumesize *= volume.clusterCount();       // we'll have a lot of clusters

  volumesize *= 512;                            // SD card blocks are always 512 bytes

  Serial.print("Volume size (bytes): ");

  Serial.println(volumesize);

  Serial.print("Volume size (Kbytes): ");

  volumesize /= 1024;

  Serial.println(volumesize);

  Serial.print("Volume size (Mbytes): ");

  volumesize /= 1024;

  Serial.println(volumesize);

  Serial.println("\nFiles found on the card (name, date and size in bytes): ");

  root.openRoot(volume);

  // list all files in the card with date and size

  root.ls(LS_R | LS_DATE | LS_SIZE);

}

void loop()

{

  // nothing happens after setup

}

15 DAYS