SD Card and Ethernet

Micro-SD卡又称TF卡，是外置大容易存储数据的不二之选。

1. Ethernet Shield

包含了有线以太网上网模块与SD卡模块两个功能。含网络发送数据的例程代码。

Ethernet W5100 网络扩展板 SD卡扩展 支持MEGA-淘宝网

1. Micro SD卡模块 SPI接口 TF卡读写卡器

Micro SD卡模块 SPI接口 TF卡读写卡器 带电平转换芯片-淘宝网

原理图

SD卡模块最核心的功能是提供从单片机到SD卡之间的SPI连接及其外部电路。

SD 卡模块非常适合练习 SPI 通信、Flash 读写操作、和文件系统等重要内容。

Examples

Guide to Arduino & Secure Digital (SD) Storage. | Arduino Documentation

文档中的代码可以直接运行。通过测试的有 Ehternet-SD shield, SD 模块。

Library

SD - Arduino Reference

To use this library:

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

Notes on using the Library and various shields.

Examples

• Card Info: Get info about your SD card.

• Datalogger: Log data from three analog sensors to an SD card.

• Dump File: Read a file from the SD card.

• Files: Create and destroy an SD card file.

• List Files: Print out the files in a directory on a SD card.

• Read Write: Read and write data to and from an SD card.

SD class

• begin()

• exists()

• exists()

• mkdir()

• open()

• remove()

• rmdir()

File class

• name()

• available()

• close()

• flush()

• peek()

• position()

• print()

• println()

• seek()

• size()

• read()

• write()

• isDirectory()

• openNextFile()

• rewindDirectory()

More Reference

GitHub - arduino-libraries/SD: SD Library for Arduino

Guide to SD Card Module with Arduino | Random Nerd Tutorials

ESP32: Guide for MicroSD Card Module Arduino | Random Nerd Tutorials