/* SD card basic file example This example shows how to create and destroy an SD card file The circuit: * SD card attached to SPI bus as follows: ** MOSI - pin 11, pin 7 on Teensy with audio board ** MISO - pin 12 ** CLK - pin 13, pin 14 on Teensy with audio board ** CS - pin 4, pin 10 on Teensy with audio board created Nov 2010 by David A. Mellis modified 9 Apr 2012 by Tom Igoe This example code is in the public domain. */ #include #include File myFile; // change this to match your SD shield or module; // Arduino Ethernet shield: pin 4 // Adafruit SD shields and modules: pin 10 // Sparkfun SD shield: pin 8 // Teensy audio board: pin 10 // Teensy 3.5 & 3.6 & 4.1 on-board: BUILTIN_SDCARD // Wiz820+SD board: pin 4 // Teensy 2.0: pin 0 // Teensy++ 2.0: pin 20 const int chipSelect = 4; void setup() { //UNCOMMENT THESE TWO LINES FOR TEENSY AUDIO BOARD: //SPI.setMOSI(7); // Audio shield has MOSI on pin 7 //SPI.setSCK(14); // Audio shield has SCK on pin 14 // Open serial communications and wait for port to open: Serial.begin(9600); while (!Serial) { ; // wait for serial port to connect. } Serial.print("Initializing SD card..."); if (!SD.begin(chipSelect)) { Serial.println("initialization failed!"); return; } Serial.println("initialization done."); if (SD.exists("example.txt")) { Serial.println("example.txt exists."); } else { Serial.println("example.txt doesn't exist."); } // open a new file and immediately close it: Serial.println("Creating example.txt..."); myFile = SD.open("example.txt", FILE_WRITE); myFile.close(); // Check to see if the file exists: if (SD.exists("example.txt")) { Serial.println("example.txt exists."); } else { Serial.println("example.txt doesn't exist."); } // delete the file: Serial.println("Removing example.txt..."); SD.remove("example.txt"); if (SD.exists("example.txt")){ Serial.println("example.txt exists."); } else { Serial.println("example.txt doesn't exist."); } } void loop() { // nothing happens after setup finishes. }