![]() If you take a close look at the Micro SD Card module, there is not much on the PCB itself. The parts marking of the SD Card Module is shown below. This sensor can be used to read SD card data with microcontroller. This is a cheap and easy-to-use sensor that can be used for many different applications. SCK Stands for Serial Clock as the name implies it is the data synchronization pulse generated by the Arduino.ĬS Stands for Chip Select, this pin can be controlled by the Arduino to enable or disable the module. This is the input pin of the SD Card Module. This is the SPI data out from the SD Card Module. VCC is the power supply pin of the micro sd card module that can be connected to 5V or 3.3V of the supply. GND is the ground pin of the micro sd card module and it should be connected to the ground pin of the Arduino. The Pinout of a Micro SD Card Module is shown below: All the pins of this sensor module are digital, except VCC and Ground. The Micro SD Card module has 6 pins those are GND, VCC, MISO, MOSI, SCK, and CS. So without further ado let's get right into it. So in this tutorial, we decided to interface the SD Card module with Arduino and we will let you know all the details. The solution to this problem is to use an SD card or micro sd card that packs gigabytes of data and its size is smaller than a one rupee coin. if (!SD.If you are an embedded engineer and working in the electronic industry, every once in a while there will be situations where you need to log and store a huge amount of data that the internal memory of an Arduino can handle, examples could be like any logger project like battery energy logger, Temperature logger or GPS Tracker. Therefore, make sure when initializing the microSD card replace the argument in the begin() function to 15. Using the begin() function on the SD filesystem, we will initialize the microSD card. As we are using ESP8266, hence its default SPI CS pin is GPIO15. We have modified one line in this sketch according to the board we are using. read from the file until there's nothing else in it: Serial.println("error opening test.txt") if the file didn't open, print an error: MyFile = SD.open("test.txt", FILE_WRITE) so you have to close this one before opening another. note that only one file can be open at a time, Serial.println("initialization failed!") Open serial communications and wait for port to open: ![]() This example code is in the public domain. ![]() This example shows how to read and write data to and from an SD card file The table below shows the default SPI pins of ESP8266 Below you can see the pinout of ESP32 DEVKIT V1 to get a better idea of the SPI default pins. Now, we will show you how to connect the microSD card module and the ESP8266 board together. Table showing the pin names and their short descriptions Interface Micro SD card module with ESP8266 NodeMCU This is called the ‘Master in Slave Out.’ It is used as the SPI output from the module. This is called the ‘Serial Clock’ pin which is used in SPI serial clock output. This is called the ‘Master Out Slave In.’ It is used as the SPI input to the module. This is the Chip Select pin for SPI communication. The adapter consists of a 3.3V voltage regulator circuit as well to cater to ESP8266’s power supply range. This is the ground pin which should be connected with the ground pin of ESP8266. We have a similar guide with the ESP32 development board and Arduino UNO as well: The SD card library provides a convenient way of storing files in the microSD card which will be discussed in later sections of this tutorial. It is one of the most reliable and practical ways to store data in devices such as mobile phones, laptops, and personal computers. Storage data including text, video, audio, CSV, HTML, JavaScript, and CSS files can all be conveniently stored in the microSD card. Using a micro SD card becomes very handy for applications where we need to store files or any data.Īdditionally, we will learn how to handle files in the microSD card including accessing the microSD card information and reading/writing to a file. This module provides an SPI interface to connect an SD card module with any microcontroller which supports the SPI communication interface. ![]() In this user guide, we will learn how to interface a micro SD card with ESP8266 NodeMCU using the microSD card module or connector and Arduino IDE. ![]()
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