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Arduino File.write()
Description
The File.write() function writes data to the file.
The File.write() function inherits from the Stream utility class.
Syntax
file.write(data)
file.write(buf, len)
Parameters
- data: the byte, char, or string (char *) to write
- buf: an array of characters or bytes
- len: the number of elements in buf
Returns
- Returns the number of bytes written
Example Code
/*
* Created by ArduinoGetStarted.com
*
* This example code is in the public domain
*
* Tutorial page: https://arduinogetstarted.com/reference/library/arduino-file.write
*/
#include <SD.h>
#define PIN_SPI_CS 4
File file;
char buf[] = "Arduino";
void setup() {
Serial.begin(9600);
if (!SD.begin(PIN_SPI_CS)) {
Serial.println(F("SD CARD FAILED, OR NOT PRESENT!"));
while (1); // don't do anything more:
}
SD.remove("arduino.txt"); // delete the file if existed
// create new file by opening file for writing
file = SD.open("arduino.txt", FILE_WRITE);
if (file) {
file.write('H'); // a character
file.write('i'); // a character
file.write('\n'); // new line
file.write(buf, 7);
file.close();
} else {
Serial.print(F("SD Card: error on opening file arduino.txt"));
}
}
void loop() {
}
After running the above code, if you disconnect SD Cart from Arduino and connect the SD Card to your your PC, you will see a arduino.txt file with the below content
Hi
Arduino
Tutorials
See Also
※ ARDUINO BUY RECOMMENDATION
| Arduino UNO R3 | |
| Arduino Starter Kit |
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