我用arduino UNO和maga2560和SD卡模块连接，读取SD卡，总是初始化不成功，用的是官方的例子就是不行。原本用的是读取tf卡的模块，后来又换了读取大卡的模块，都是识别不到SD卡。困扰我好几天了，求各位大佬帮助！
接线：VCC接的是3.3v，之前接5v也试过了
** MOSI - pin 11
** MISO - pin 12
** CLK - pin 13
** CS - pin 4
代码：
#include <SPI.h>
#include <SD.h>
const int chipSelect = 4;
void setup() {
// Open serial communications and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}
Serial.print("Initializing SD card...");
// see if the card is present and can be initialized:
if (!SD.begin(chipSelect)) {
Serial.println("Card failed, or not present");
// don't do anything more:
return;
}
Serial.println("card initialized.");
}
void loop() {
// make a string for assembling the data to log:
String dataString = "";
// read three sensors and append to the string:
for (int analogPin = 0; analogPin < 3; analogPin++) {
int sensor = analogRead(analogPin);
dataString += String(sensor);
if (analogPin < 2) {
dataString += ",";
}
}
// open the file. note that only one file can be open at a time,
// so you have to close this one before opening another.
File dataFile = SD.open("datalog.txt", FILE_WRITE);
// if the file is available, write to it:
if (dataFile) {
dataFile.println(dataString);
dataFile.close();
// print to the serial port too:
Serial.println(dataString);
}
// if the file isn't open, pop up an error:
else {
Serial.println("error opening datalog.txt");
}
}

对了，我的小卡的格式也是FAT格式的，特意买的2g的，之前16g的也不行

求助

两排排针搞定的事竟然还要卡槽！