The Tarjeta+SD, also known as the SD card module, is a commonly used component in Arduino projects. It allows the Arduino to read and write data to an SD card, providing a convenient way to store and retrieve information. This module is particularly useful in applications that require data logging, such as weather stations, data loggers, and IoT devices.

To use the Tarjeta+SD module with Arduino, you need to make some adjustments to the code and connections. The module communicates with the Arduino using the SPI (Serial Peripheral Interface) protocol, which requires specific pins to be connected. Additionally, you need to include the SD library in your Arduino sketch to access the SD card functions.

Project: SD Card Data Logger

In this project, we will create a simple data logger using the Tarjeta+SD module and Arduino. The objective is to read data from a sensor and store it on an SD card for later analysis. The functionality of the data logger includes initializing the SD card, creating a new file, writing data to the file, and closing the file.

Components List:

• Arduino Uno (1)
• Tarjeta+SD module (1)
• Sensor (e.g., temperature sensor, humidity sensor, etc.) (1)
• Jumper wires (as required)

Examples:

1. Initializing the SD Card:

   
   #include <SD.h>

const int chipSelect = 10;

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

// Initialize the SD card if (!SD.begin(chipSelect)) { Serial.println("SD card initialization failed!"); return; }

Serial.println("SD card initialized."); }

void loop() { // Your code here }

This example demonstrates how to initialize the SD card using the `SD.begin()` function. The `chipSelect` pin is specified as 10, which is the default pin for most Arduino boards. If the initialization fails, an error message is printed to the serial monitor.

2. Creating a New File:
```arduino
#include <SD.h>

const int chipSelect = 10;
File dataFile;

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

  if (!SD.begin(chipSelect)) {
    Serial.println("SD card initialization failed!");
    return;
  }

  // Create a new file
  dataFile = SD.open("data.txt", FILE_WRITE);

  if (!dataFile) {
    Serial.println("Error opening file!");
    return;
  }

  Serial.println("File created.");
}

void loop() {
  // Your code here
}

In this example, we create a new file named "data.txt" using the SD.open() function. The FILE_WRITE parameter specifies that we want to write to the file. If the file creation fails, an error message is printed to the serial monitor.

3. Writing Data to the File:

   
   #include <SD.h>

const int chipSelect = 10; File dataFile;

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

if (!SD.begin(chipSelect)) { Serial.println("SD card initialization failed!"); return; }

dataFile = SD.open("data.txt", FILE_WRITE);

if (!dataFile) { Serial.println("Error opening file!"); return; }

// Write data to the file dataFile.println("Hello, world!");

// Close the file dataFile.close();

Serial.println("Data written to file."); }

void loop() { // Your code here }

In this example, we write the string "Hello, world!" to the file using the `dataFile.println()` function. After writing the data, we close the file using the `dataFile.close()` function. The written data can be viewed in the file "data.txt" on the SD card.