从文本文件中读取数据并在Arduino串行监视器上打印

Question

我想从文本文件中读取数据，并希望在Arduino串行监视器上显示它。以下是我从

中提取的代码

Code extracted from！

#include<SD.h> 
File myfile;
void setup(){

Serial.begin(9600);

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

// declare default CS pin as OUTPUT
pinMode(53, OUTPUT);

if (!SD.begin(4)) {
  Serial.println("initialization of the SD card failed!");
  return;
}
Serial.println("initialization of the SDcard is done.");

// open the text file for reading:
myfile = SD.open("help2.txt");
if (myfile){
     Serial.println("help2.txt:");

     // read all the text written on the file
     while (myfile.available()){
         Serial.println(myfile.read());
     }
     // close the file:
     myfile.close();
} 
else {
    // if the file didn't open, report an error:
    Serial.println("error opening the text file!");
}
}

void loop(){
}

但是当代码在Arduino上编译和上传时，只有“正在初始化卡...”正在串行监视器上打印。我想获得串行监视器上文本文件中的完整数据。