Project44.SD Card Info
=======================

Description
------------


Specification
--------------
Product weight: 10g
Product color: blue.
Power supply voltage: 3.3,5V two voltages.

Connect
--------
.. image:: /img/connect/44_bb.png

Code
-----
.. code-block:: c

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

    File myFile;


    void setup() {
    // Open serial communications and wait for port to open:
    Serial.begin(9600);

    while (!Serial) {
        ; // wait for serial port to connect. Needed for native USB port only
    }

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

    if(!SD.begin(4)){
        Serial.println("Initializing failed!");
        while(1);
    }
    Serial.println("Initializing done.");

    if(SD.exists("example.txt")){
        Serial.println("example.txt exits.");
    }else{
        Serial.println("example.txt doesn't exist.");
    }

    Serial.println("Creating example.txt...");
    myFile = SD.open("example.txt", FILE_WRITE);
    myFile.write("Hello");
    Serial.println("Writing to file successful");
    myFile.close();
    }

    void loop(){
    
    }

Phenomenon
-----------

.. image:: /img/phenomenon/44.jpg