Hello,

I'm trying to make a program which logs the data received at my com-port. You probably also know the arduino-boards, I attached a sensor to this board and made a connection with my pc. The program I load on my arduino works, but the one on processing gives an error and I can't find the problem.

The error is: unhandled exception type IOException. I searched the internet and I saw a couple of posts on this topic. But they all say I have to add "throw IOEception" in the line. This doesn't work, so I was wondering if someone on this forum might know the solution.

1. import processing.serial.*;
2. import java.util.Date;
3. Serial myPort;
4. FileWriter file;
5. String filename;
6. void setup()
7. {
8.   myPort = new Serial(this, "COM4", 115200);
9.   long thisDate = new Date().getTime();
10.   filename =  "output-" + thisDate + ".txt";
11.     try {
12.        String emptyStart = "";
13.        file = new FileWriter(filename, false); // Wtrite empty string to file to clear it on start
14.        file.write(emptyStart, 0, emptyStart.length()); //(string, start char, end char)
15.        //file.close();
16.      } 
17.        catch(Exception e) 
18.      { 
19.        println("Error: Can't open file!");
20.      }
21.   }
22. void draw()
23. {
24.   readSerial();
25. }
26. void readSerial()
27. {
28.   println(myPort.available());
29.   if (myPort.available() > 5) {
30.     int serial_in = myPort.read(); // read a byte from the Serial Port
31.     while (serial_in != 255) {
32.       serial_in = myPort.read(); // read until value 255 is read
33.     }
34.     int lowByte = myPort.read();
35.     int highByte = myPort.read();
36.     int sample = highByte * 256 + lowByte;
37.     lowByte = myPort.read();
38.     highByte = myPort.read();
39.     int timestamp = highByte * 256 + lowByte;
40.     myPort.clear();
41.   }
42. }
43. void keyPressed(){
44.  
45.   if ( key == 's' ){
46.      file.close();
47.      exit();
48.   }
49. }

I hope you guys can help me, Thanks