Serial port error with ARDUINO

Processing Libraries
1

First hello to all, I’m brand new to this community!
So forgive me if my questions are basic.
I tried to find answer with a search, but did not find.

As a first attempt, I wish to link an ARDUINO and Processing, using the code found in Sparkfun.
Here is my setup (of course serial library and all other variable have been initialized):
myPort = new Serial(this, Serial.list()[9], 9600);

I checked in the Reference, and this is how a port should be initialized.

And here, the error I get:
ArrayIndexOutof BoundsException: 9

As far as I understand, the port#9 is not recognized, although it is used by my MEGA.
I tried to input other serial ports numbers, but all ports above 6 (that means 7 and further) are rejected, although they are valid, as I use them for other application.

Is there a limitation on port numbers?? If this is the case, I found no mention in Library docs.

Thanks for your help.

Gerard.

2

Look what port the arduino connects to from the settings in the arduino IDE and write this instead of Serial.list()[9]

eg “COM1” or “/dev/tty”

keep the " "

this works for me

3

Hi, I am also new to this forum. I did this same exercise over the weekend. My Arduino was on COM3 on my computer. I used [0] to connect. If you use debug and look at the Serial.list()[0] then Serial.list()[1] etc. Then use prntln to print these values you can find the correct port. I am still learning this but hope this advice helps.

4

Thanks a lot, it works.

From time ti time it sends a “null” instead of the Welcome, but this is probably a timing problem which I should solve quickly.

Have a nice day.
Gerard.

5

Hi Roger,

I was sure port is #9, so former advice solved the problem.
Thanks anyway for jumping in.

6

Did you solve your problem? First thing I will do before I open any port is to print the list of ports P3 sees:

println(Serial.list());

A neat trick is to run this code before you connect your arduino and then run it a second time after your arduino is connected. You wil be able to see what port your arduino is using.

Kf

7

OK, but anyway, you have to upload the ARDUINO program in the board, so you know the used port, as you have to configure it with Arduino tools in the IDE…,