How to write data to a text file on Arduino - string

Question

I have some position data continually coming in and I am currently printing it to the serial.
Say I have the string "5" and want to print that to a text file, "myTextFile", what would I need to do to achieve this? To be clear, the text file would be saved on my computer not on an SD card on the Arduino.
Also, is their a way to create a text file within the program before I start saving to it?

Answer 1

You can create a python script to read the serial port and write the results into a text file:
##############
## Script listens to serial port and writes contents into a file
##############
## requires pySerial to be installed
import serial # sudo pip install pyserial should work
serial_port = '/dev/ttyACM0';
baud_rate = 9600; #In arduino, Serial.begin(baud_rate)
write_to_file_path = "output.txt";
output_file = open(write_to_file_path, "w+");
ser = serial.Serial(serial_port, baud_rate)
while True:
line = ser.readline();
line = line.decode("utf-8") #ser.readline returns a binary, convert to string
print(line);
output_file.write(line);

Answer 2

U have to Use serial-lib for this
Serial.begin(9600);
Write your sensor values to the serial interface using
Serial.println(value);
in your loop method
on the processing side use a PrintWriter to write the data read from the serial port to a file
import processing.serial.*;
Serial mySerial;
PrintWriter output;
void setup() {
mySerial = new Serial( this, Serial.list()[0], 9600 );
output = createWriter( "data.txt" );
}
void draw() {
if (mySerial.available() > 0 ) {
String value = mySerial.readString();
if ( value != null ) {
output.println( value );
}
}
}
void keyPressed() {
output.flush(); // Writes the remaining data to the file
output.close(); // Finishes the file
exit(); // Stops the program
}