如何使用Arduino创建变量文件名并在sd卡上存储变量

Arduino IDE中的示例“SD_测试”非常有效。现在我想扩展它

首先：我想使用变量文件名。我在互联网和stackoverlow中找到了一些例子，但没有任何效果（仍在搜索一个最小的例子）

我想要

writeFile(SD, filename, "Hello ");

其中filename是一个处理类似“file.txt”的变量

Second：我想对要保存在此文件中的内容执行相同的操作。所以不是

writeFile(SD, "/hello.txt", "Hello ");

我想要

writeFile(SD, "/hello.txt", datas);

举个例子：我可以把这个打印出来

        printf("%04x", datas);

---

现在，我想在文件中用4个十六进制来保存这个变量“datas”，它在串行监视器中的外观正好如此。

您可以使用以下代码在SD卡上写入。 您需要下载两个库文件，因为代码中提到了此名称。 记住先将SD卡格式化为FAT32 希望这对你有帮助

/*  Author: Ashish Kumar
    Org: INVOOTECH                            */
#include <SPI.h>
#include <SD.h>

Sd2Card card;
SdVolume volume;

File myFile;
 char *b="hellow.txt";
 char p;
const int chipSelect = 4;

void setup() {
Serial.begin(9600);
 if (!card.init(SPI_HALF_SPEED, chipSelect))   //error statement
  {
    Serial.println("initialization failed. Things to check:");
    return;
  }
  if (!volume.init(card))           //error statement
  {
    Serial.println("Could not find FAT16/FAT32 partition.\nMake sure you've formatted the card");
    return;
  }
    if (!SD.begin(4)) {
    Serial.println("initialization failed!");
    return;
  }

}

void loop() {
  myFile = SD.open(b);
if (myFile) {
      p=myFile.read();
      Serial.write(p);
    }
    // close the file:
    myFile.close();

}

/*作者：Ashish Kumar
组织：INVOOTECH*/
#包括
#包括
Sd2Card卡；
SDV体积；
文件myFile；
char*b=“hellow.txt”；
charp；
常数int chipSelect=4；
无效设置（）{
Serial.begin（9600）；
if（！card.init（SPI_半_速度，chipSelect））//错误语句
{
Serial.println（“初始化失败。要检查的内容：”）；
返回；
}
if（！volume.init（card））//错误语句
{
Serial.println（“找不到FAT16/FAT32分区。\n请确保已格式化卡”）；
返回；
}
如果（！SD.begin（4））{
Serial.println（“初始化失败！”）；
返回；
}
}
void循环（）{
myFile=SD.open（b）；
如果（我的文件）{
p=myFile.read（）；
串行写入（p）；
}
//关闭文件：
myFile.close（）；
}

好的。所以我所做的就是在循环中创建一个文件

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

File myFile;

int chipSelectNumber = 10;
String prefix = "test";
String extension = ".txt";
String filename;
int fileNumber=0;
void setup() {
  Serial.begin(9600);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only
  }  
  initSDCard();
}
void loop() {
  createFileAndEnterData();  

}

//This Function will create file and Enter modbus data in the file
void createFileAndEnterData(){

 String temp;
 temp = prefix;
 temp.concat(fileNumber);
 temp.concat(extension);
 filename = temp;
 Serial.println(filename);
 fileNumber++;
 boolean statusFileCreate = createFile(filename);
 if(statusFileCreate){
  Serial.println("File Creation Successful");
 }
 else{
  Serial.println("File Creation Unsuccessful");
 }
 delay(1000);
}

boolean createFile(String fileName){
  myFile = SD.open(fileName, FILE_WRITE);
  if(myFile){
    Serial.print("Creating file : ");
    Serial.print(fileName);
    Serial.print(" ");
    myFile.println("");
    myFile.close();
    return true;
  }
  else{
    return false;
  }
}


void initSDCard(){

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

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

void openFile(String fileName){ 
  myFile = SD.open(fileName, FILE_WRITE);
  if (myFile) {
    Serial.println("Opened File");
  } else {
    Serial.println("error opening test.txt");
  } 
}
void deleteFile(String filename){

}
void writeFile(String fileName){
    // re-open the file for reading:
  myFile = SD.open(fileName);
  if (myFile) {
    Serial.println(fileName);

    // read from the file until there's nothing else in it:
    while (myFile.available()) {
      Serial.write(myFile.read());

    }
    myFile.close();

  } else {
    // if the file didn't open, print an error:
    Serial.println("error opening test.txt");
  }

}

希望这能解决你的问题。

---

谢谢。

错误：Sd2Card卡未命名类型/SdVolume卷未命名类型您能否与arduino uno共享sd卡模块的连接，以便我可以更好地帮助您。

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

File myFile;

int chipSelectNumber = 10;
String prefix = "test";
String extension = ".txt";
String filename;
int fileNumber=0;
void setup() {
  Serial.begin(9600);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only
  }  
  initSDCard();
}
void loop() {
  createFileAndEnterData();  

}

//This Function will create file and Enter modbus data in the file
void createFileAndEnterData(){

 String temp;
 temp = prefix;
 temp.concat(fileNumber);
 temp.concat(extension);
 filename = temp;
 Serial.println(filename);
 fileNumber++;
 boolean statusFileCreate = createFile(filename);
 if(statusFileCreate){
  Serial.println("File Creation Successful");
 }
 else{
  Serial.println("File Creation Unsuccessful");
 }
 delay(1000);
}

boolean createFile(String fileName){
  myFile = SD.open(fileName, FILE_WRITE);
  if(myFile){
    Serial.print("Creating file : ");
    Serial.print(fileName);
    Serial.print(" ");
    myFile.println("");
    myFile.close();
    return true;
  }
  else{
    return false;
  }
}


void initSDCard(){

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

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

void openFile(String fileName){ 
  myFile = SD.open(fileName, FILE_WRITE);
  if (myFile) {
    Serial.println("Opened File");
  } else {
    Serial.println("error opening test.txt");
  } 
}
void deleteFile(String filename){

}
void writeFile(String fileName){
    // re-open the file for reading:
  myFile = SD.open(fileName);
  if (myFile) {
    Serial.println(fileName);

    // read from the file until there's nothing else in it:
    while (myFile.available()) {
      Serial.write(myFile.read());

    }
    myFile.close();

  } else {
    // if the file didn't open, print an error:
    Serial.println("error opening test.txt");
  }

}

void createFileAndEnterData(){

 String temp;
 temp = prefix;
 temp.concat(fileNumber);
 temp.concat(extension);
 filename = temp;
 Serial.println(filename);
 fileNumber++;
 boolean statusFileCreate = createFile(filename);
 if(statusFileCreate){
  Serial.println("File Creation Successful");
 }
 else{
  Serial.println("File Creation Unsuccessful");
 }
 delay(1000);
}