Arduino 我的代码没有'；I don’我不能进入if循环将数据输入我的SD卡，为什么会这样？

我不明白为什么我的代码没有写入SD卡。我尝试了各种其他方法来获取卡上的数据。代码没有进入页面底部的IF循环。可能是我输入了错误的pin以获取数据吗？我使用Arduino mega上的引脚RX3 15获取数据？该插脚会被视为插脚63吗？我在网上看了一张图表，上面是这么说的

#include <SD.h>
#include <SPI.h>
#include <Wire.h>
File mySensorData;
int chipSelect = 63; 


String inputstring = "";                              //a string to hold incoming data from the PC
String sensorstring = "";                             //a string to hold the data from the Atlas Scientific product
boolean input_string_complete = false;                //have we received all the data from the PC
boolean sensor_string_complete = false;               //have we received all the data from the Atlas Scientific product


void setup() {    //set up the hardware
  SD.begin(chipSelect);
  pinMode(10, OUTPUT);

  Serial.begin(9600);                                 //set baud rate for the hardware serial port_0 to 9600
  Serial3.begin(9600);                                //set baud rate for software serial port_3 to 9600
  inputstring.reserve(10);                            //set aside some bytes for receiving data from the PC
  sensorstring.reserve(30);                           //set aside some bytes for receiving data from Atlas Scientific product
}


void serialEvent() {                                  //if the hardware serial port_0 receives a char
  inputstring = Serial.readStringUntil(13);           //read the string until we see a <CR>
  input_string_complete = true;                       //set the flag used to tell if we have received a completed string from the PC
}


void serialEvent3() {                                 //if the hardware serial port_3 receives a char
  sensorstring = Serial3.readStringUntil(13);         //read the string until we see a <CR>
  sensor_string_complete = true;                      //set the flag used to tell if we have received a completed string from the PC
}


void loop() {                                         //here we go...


  if (input_string_complete == true) {                //if a string from the PC has been received in its entirety
    Serial3.print(inputstring);                       //send that string to the Atlas Scientific product
    Serial3.print('\r');                              //add a <CR> to the end of the string
    inputstring = "";                                 //clear the string
    input_string_complete = false;                    //reset the flag used to tell if we have received a completed string from the PC
  }

  if (sensor_string_complete == true) {               //if a string from the Atlas Scientific product has been received in its entirety
    if (isdigit(sensorstring[0]) == false) {          //if the first character in the string is a digit
      Serial.println(sensorstring);                   //send that string to the PC's serial monitor
    }
    else                                              //if the first character in the string is NOT a digit
    {
      print_EC_data();                                //then call this function
    }
    sensorstring = "";                                //clear the string
    sensor_string_complete = false;                   //reset the flag used to tell if we have received a completed string from the Atlas Scientific product
  }
}


void print_EC_data(void) {                            //this function will pars the string

  char sensorstring_array[30];                        //we make a char array
  char *EC;                                           //char pointer used in string parsing
  char *TDS;                                          //char pointer used in string parsing
  char *SAL;                                          //char pointer used in string parsing
  char *GRAV;                                         //char pointer used in string parsing
  float f_ec;                                         //used to hold a floating point number that is the EC

  sensorstring.toCharArray(sensorstring_array, 30);   //convert the string to a char array
  EC = strtok(sensorstring_array, ",");               //let's pars the array at each comma
  TDS = strtok(NULL, ",");                            //let's pars the array at each comma
  SAL = strtok(NULL, ",");                            //let's pars the array at each comma
  GRAV = strtok(NULL, ",");                           //let's pars the array at each comma

if(mySensorData){
  Serial.print("EC:");                                //we now print each value we parsed separately
  Serial.println(EC);                                 //this is the EC value

  Serial.print("TDS:");                               //we now print each value we parsed separately
  Serial.println(TDS);                                //this is the TDS value

  Serial.print("SAL:");                               //we now print each value we parsed separately
  Serial.println(SAL);                                //this is the salinity value

  Serial.print("GRAV:");                              //we now print each value we parsed separately
  Serial.println(GRAV);                               //this is the specific gravity
  Serial.println();                                   //this just makes the output easier to read


mySensorData= SD.open("CPData", FILE_WRITE);
mySensorData.print(EC);
mySensorData.close();
}
}

#包括
#包括
#包括
文件mySensorData；
int-chipSelect=63；
字符串inputstring=“”//用于保存来自PC的传入数据的字符串
字符串传感器字符串=”//用于保存Atlas科学产品数据的字符串
布尔输入\字符串\完成=假//我们是否已收到来自PC的所有数据
布尔传感器字符串完成=假//我们是否收到了Atlas科学产品的所有数据
void setup（）{//设置硬件
SD.begin（芯片选择）；
pinMode（10，输出）；
Serial.begin（9600）；//将硬件串行端口0的波特率设置为9600
Serial3.begin（9600）；//将软件串行端口_3的波特率设置为9600
inputstring.reserve（10）；//留出一些字节用于从PC接收数据
sensorstring.reserve（30）；//留出一些字节用于从Atlas Scientific product接收数据
}
void serialEvent（）{//如果硬件串行端口_0接收到字符
inputstring=Serial.readStringUntil（13）；//读取字符串直到看到
input_string_complete=true；//设置用于指示是否已从PC收到已完成字符串的标志
}
void serialEvent3（）{//如果硬件串行端口_3接收到字符
sensorstring=Serial3.readStringUntil（13）；//读取字符串直到看到
sensor_string_complete=true；//设置用于指示我们是否已从PC收到完整字符串的标志
}
void loop（）{//我们开始。。。
if（input_string_complete==true）{//如果从PC接收到完整的字符串
Serial3.print（inputstring）；//将该字符串发送到Atlas Scientific产品
Serial3.print（'\r'）；//在字符串末尾添加一个
inputstring=”“；//清除该字符串
input_string_complete=false；//重置用于指示我们是否已从PC收到完整字符串的标志
}
if（sensor_string_complete==true）{//如果已收到Atlas Scientific产品的全部字符串
if（isdigit（sensorstring[0]）==false）{//如果字符串中的第一个字符是数字
Serial.println（sensorstring）；//将该字符串发送到PC的串行监视器
}
else//如果字符串中的第一个字符不是数字
{
print_EC_data（）；//然后调用此函数
}
sensorstring=“；//清除该字符串
sensor_string_complete=false；//重置用于告知我们是否已从Atlas Scientific产品收到完整字符串的标志
}
}
void print_EC_data（void）{//此函数将对字符串进行pars
char sensorstring_数组[30]；//我们制作一个char数组
char*EC；//字符串解析中使用的char指针
char*TDS；//字符串解析中使用的char指针
char*SAL；//字符串解析中使用的字符指针
char*GRAV；//字符串解析中使用的char指针
float f_ec；//用于保存作为ec的浮点数
toCharArray（sensorstring_数组，30）；//将字符串转换为字符数组
EC=strtok（sensorstring_数组，“”；//让我们在每个逗号处对数组进行PAR
TDS=strtok（NULL，“”；//让我们在每个逗号处对数组进行PAR
SAL=strtok（NULL，“”；//让我们在每个逗号处对数组进行PAR
GRAV=strtok（NULL，“”；//让我们在每个逗号处对数组进行PAR
if（mySensorData）{
Serial.print（“EC:”；//我们现在分别打印解析的每个值
Serial.println（EC）；//这是EC值
Serial.print（“TDS:”）；//我们现在分别打印解析的每个值
Serial.println（TDS）；//这是TDS值
Serial.print（“SAL:”；//我们现在分别打印解析的每个值
Serial.println（SAL）；//这是盐度值
Serial.print（“GRAV:）；//现在我们分别打印解析的每个值
Serial.println（GRAV）；//这是比重
Serial.println（）；//这只会使输出更易于阅读
mySensorData=SD.open（“CPData”，文件写入）；
mySensorData.print（EC）；
mySensorData.close（）；
}
}

如果（mySensorData）你不需要在

之前打开一个文件吗？我不这么认为。你是说我把[mySensorData=SD.open（“CPData”，FILE_WRITE）；]放在[if（mySensorData）]之前吗？如果你不调用
mySensorData=SD.open（），
mySensorData
可能为空。如果为空，
If（mySensorData）
的计算结果总是
false
。希望我能理解您的意思，但我会