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ESP8266_SD_Example.ino

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+// Example of using the Serial Data Card Filing System
+
+#include <SD.h>;
+
+void setup() {
+  Serial.begin(115200);
+  Serial.println("Starting...");
+  if (!SD.begin(D8)) Serial.println("initialization failed!");
+}
+
+void loop() {
+  // Assign a file name e.g. 'names.dat' or 'data.txt' or 'data.dat' try to use the 8.3 file naming convention format could be 'data.d'
+  char filename [] = "datalog.txt";                     // Assign a filename or use the format e.g. SD.open("datalog.txt",...);
+
+  if (SD.exists(filename)) SD.remove(filename);         // First in this example check to see if a file already exists, if so delete it
+  File myDataFile = SD.open(filename, FILE_WRITE);      // Open a file for reading and writing (appending)
+  if (!myDataFile)Serial.println("file open failed");   // Check for errors
+
+  myDataFile.println("ABCDEFGHIJKLMNOPQRSTUVWXYZ");     // Write some data to it (26-characters)
+  myDataFile.println(3.141592654);
+  Serial.println(myDataFile.size());                    // Display the file size (26 characters + 4-byte floating point number + 6 termination bytes (2/line) = 34 bytes)
+  myDataFile.close();                                   // Close the file
+
+  myDataFile = SD.open(filename, FILE_READ);              // Open the file again, this time for reading
+  if (!myDataFile) Serial.println("file open failed");  // Check for errors
+  while (myDataFile.available()) {
+    Serial.write(myDataFile.read());                    // Read all the data from the file and display it
+  }
+  myDataFile.close();                                   // Close the file
+  delay(10000);                                         // wait and then do it all again
+}

ESP8266_SD_SPIFFS_Example.ino

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+// Example of using the Serial Data Card Filing System
+#define FS_NO_GLOBALS //allow spiffs to coexist with SD card, define BEFORE including FS.h
+#include <FS.h> //spiff file system
+#include "SD.h";
+//#define SD_MODE
+
+void setup() {
+  Serial.begin(115200);
+  Serial.println("Starting...");
+  #ifdef SD_MODE
+    if (!SD.begin(D8)) Serial.println("initialization failed!");
+  #else
+    SPIFFS.begin();
+  #endif
+}
+
+void loop() {
+  // Assign a file name e.g. 'names.dat' or 'data.txt' or 'data.dat' try to use the 8.3 file naming convention format could be 'data.d'
+  char filename [] = "datalog.txt";                     // Assign a filename or use the format e.g. SD.open("datalog.txt",...);
+
+  #ifdef SD_MODE
+    if (SD.exists(filename)) SD.remove(filename);         // First in this example check to see if a file already exists, if so delete it
+    File myDataFile = SD.open(filename, FILE_WRITE);    // Open a file for reading and writing (appending)
+  #else
+    if (SPIFFS.exists(filename)) SPIFFS.remove(filename);         // First in this example check to see if a file already exists, if so delete it
+    fs::File myDataFile = SPIFFS.open(filename, "a+");          // Open a file for reading and writing (appending)
+  #endif
+
+  if (!myDataFile)Serial.println("file open failed");   // Check for errors
+
+  myDataFile.println("ABCDEFGHIJKLMNOPQRSTUVWXYZ");     // Write some data to it (26-characters)
+  myDataFile.println(3.141592654);
+  Serial.println(myDataFile.size());                    // Display the file size (26 characters + 4-byte floating point number + 6 termination bytes (2/line) = 34 bytes)
+  myDataFile.close();                                   // Close the file
+
+  #ifdef SD_MODE
+    myDataFile = SD.open(filename, FILE_READ);    // Open a file for reading and writing (appending)
+  #else
+    myDataFile = SPIFFS.open(filename, "r");          // Open a file for reading and writing (appending)
+  #endif
+  if (!myDataFile) Serial.println("file open failed");  // Check for errors
+  while (myDataFile.available()) {
+    Serial.write(myDataFile.read());                    // Read all the data from the file and display it
+  }
+  myDataFile.close();                                   // Close the file
+  delay(10000);                                         // wait and then do it all again
+}
+

ESP8266_SPIFFS_Example.ino

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+// Example of using the Serial Peripheral Interface Flash Filing System (SPIFFS) or SPI bus Flash memory Filing System
+
+#include <FS.h> //spiff file system
+
+void setup() {
+  Serial.begin(115200);
+  Serial.println("Starting...");
+  SPIFFS.begin();
+}
+
+void loop() {
+  // Assign a file name e.g. 'names.dat' or 'data.txt' or 'data.dat' try to use the 8.3 file naming convention format could be 'data.d'
+  char filename [] = "datalog.txt";                     // Assign a filename or use the format e.g. SD.open("datalog.txt",...);
+
+  if (SPIFFS.exists(filename)) SPIFFS.remove(filename); // First in this example check to see if a file already exists, if so delete it
+
+  File myDataFile = SPIFFS.open(filename, "a+");        // Open a file for reading and writing (appending)
+  if (!myDataFile)Serial.println("file open failed");   // Check for errors
+
+  myDataFile.println("ABCDEFGHIJKLMNOPQRSTUVWXYZ");     // Write some data to it (26-characters)
+  myDataFile.println(3.141592654);
+  Serial.println(myDataFile.size());                    // Display the file size (26 characters + 4-byte floating point number + 6 termination bytes (2/line) = 34 bytes)
+  myDataFile.close();                                   // Close the file
+
+  myDataFile = SPIFFS.open(filename, "r");              // Open the file again, this time for reading
+  if (!myDataFile) Serial.println("file open failed");  // Check for errors
+  while (myDataFile.available()) {
+    Serial.write(myDataFile.read());                    // Read all the data from the file and display it
+  }
+  myDataFile.close();                                   // Close the file
+  delay(10000);                                         // wait and then do it all again
+}