Logging Arduino data as .csv

edited September 2014 in Arduino

Hello everybody, I need your help please.

I am trying to log accelerometer data (via Processing 2.2.1) as .csv file to allow me to graphically present the data in Excel, however I am struggling with the Processing code. When I run the following it presents the error: "The function readArduinoInt() does not exist". I have extensively searched this issue for the past 3 nights and drawn a blank. I have taken this sketch directly from O'Reilly's Arduino Cookbook. Any pointers would be greatly appreciated.

* ReceiceMultipleFieldsBinarytoFile_P
* portIndex must be set to the port connected to the Arduino
* based on ReceiceMultipleFieldsBinarytoFile, tis version saves data to file
* Press any key to stop logging and save file

import processing.serial.*;
import java.util.*;
import java.text.*;

PrintWriter output;
DateFormat fnameFormat= new SimpleDateFormat("yyMMdd_HHmm");
DateFormat timeFormat = new SimpleDateFormat("hh:mm:ss");
String fileName;

Serial myPort;    // Create object from Serial Class
short portIndex = 4;  // Select the com port, 0is the first port
char HEADER = 'H';

void setup()
  size(200, 200);
  //Open whatever serial port is connected to Arduino.
  String portName = Serial.list()[portIndex];
  println(" Connecting to -> " + Serial.list()[portIndex]);
  myPort = new Serial(this, portName, 9600);
  Date now = new Date();
  fileName = fnameFormat.format(now);
  output = createWriter(fileName + ".csv"); // save the file in the sketch folder

void draw()
  int val;
  String time;

  if ( myPort.available() >= 15)    // wait for the entire message to arrive
    if ( myPort.read() == HEADER)    // is this the Header
      String timeString = timeFormat.format(new Date());
      val = readArduinoInt(); 
      // read but don't output the digital values

      // output the six analogues values delimited by a coma
      for(int i=0; i < 6; i ++){
        val = readArduinoInt();
        output.print("," + val);

void keyPressed() {
  output.flush();  // Writes the remaining data to the file
  output.close();  // Finishes the file
  exit();  // Stops the program

// return the integer value from bytes received on the serial port
// (in low,high order)
int readAduinoInt()
  int val;    // Data received from the serial port

  val = myPort.read();    // read the least significant byte
  val = myPort.read() * 256 + val;  // add the most signifcant byte
  return val;

Many thanks NS


  • @ line #66, you've mistyped the word Arduino! You forgot its letter r! :(|)

  • The hours I spent looking at this code, what a moron....many thanks GoToLoop :-)

  • Incidentally, when I run the code above the csv file is empty despite the Arduino serial monitor showing the data. If anyone has any suggests I would be very grateful.

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