Hello,

I'm trying to do a processing sketch that generates some G-Code, and then sends it to the 3D printer.
The G-code generating it's fine, but I have problems in the comunication with the printer, as it seems to do nothing with the Gcode I send to it.

This is a example code of the communication with the printer, sending the code "G28 Z0" for putting the z-platform in the origin, but it does nothing. When I start the sketch, the printer seems to start, but then does nothing when I send the code.

Also, when the communication starts, the sketch receives some data from the serial communication, that is something like this: "¨¡ŒŒ„©`‡¤žÖ-9î©ÌŠHì†Äi}Ú˜?Cjóá"

I've tried different baudrates and the result is similar...


Here is the sample code:

1. import processing.serial.*;
2. // Serial and communication variables
3. Serial myPort;  // Create object from Serial class
4. String portName="COM5";
5. void setup()
6. {
7.   size(600,335);
8.  
9.   myPort = new Serial(this, portName, 250000); //9600 115200 250000
10.  
11. }
12. void draw(){
13.   background(20);
14.  
15.   if(myPort.available()== 0){
16.     //Sending Gcode
17.     myPort.write("G28 Z0  "+ '\n');
18.  
19.   }
20.   else{
21.    
22.     byte[] inBuffer = new byte[7];
23.    
24.     inBuffer = myPort.readBytes();
25.     myPort.readBytes(inBuffer);
26.     if (inBuffer != null) {
27.       String myString = new String(inBuffer);
28.       println("READED BYTES: "+myString);
29.     }
30.   }
31. }//END DRAW

The firmware of the ultimaker it's "Marlin 13.03 (250000_single)",


Any help would be much appreciated