Finding the right serial port for Arduino

salvatore_94

Hi guys, in my project i have to communicate with arduino by the serial port. I'm using this code:

port = new Serial(this, Serial.list()[0], 115200);

But is there a way to find automatically the right port? because on others computers i have always to change the number of port, like 1 or 2. Is there a command that can do that?

Thank you

GoToLoop

• Dunno whether an automatic computer decision choice is possible here. :-<
• However you can ask the user which 1 of the Serial.list() the sketch's gonna use.
• If there are 4 listed, ask the user for the index number and use it for instantiating Serial.
• In order to get a user input, you can use JOptionPane and its showinputdialog() method.
• Or use a library which already implements that. Take a look @ here:
  https://forum.Processing.org/two/discussion/13492/storing-input-after-using-jpaneoption

GoToLoop

• Another possibility is having a file in "data/" w/ just the index value to be used.
• A simple int idx = int(loadStrings("port.txt")[0]); is enough to grab the stored value.
  https://Processing.org/reference/loadStrings_.html
• Then String port = Serial.list()[idx];. And finally: new Serial(this, port, 115200);.

colouredmirrorball

If you have multiple Arduinos you could store a number in the Arduino code and ask it to send the number to the Processing sketch. You'd have to create a new Serial object for each connected device but only use the one with the correct number.