Arduino:
阅读文本文件

#include <SD.h>

File myFile;

void setup() {
  Serial.begin(9600);
  if (!SD.begin(4)) {
    Serial.println("SD card initialization failed!");
    return;
  }
  myFile = SD.open("test.txt");
  if (myFile) {
    while (myFile.available()) {
      Serial.write(myFile.read());
    }
    myFile.close();
  } else {
    Serial.println("Error opening test.txt");
  }
}

void loop() {
  // Nothing here
}