Reading arduino serial connection in python

Question

I'm trying to connect to my Ardiuno with Python on my Ubuntu computer. I tried this example: http://playground.arduino.cc/interfacing/python

But I always get:

>>> import serial
>>> ser = serial.Serial('/dev/tty.usbserial', 9600)
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
 File "build/bdist.linux-x86_64/egg/serial/serialutil.py", line 282, in __init__
 File "build/bdist.linux-x86_64/egg/serial/serialposix.py", line 289, in open
OSError: [Errno 2] No such file or directory: '/dev/tty.usbserial'
>>> 

I can use the serial connection in sketch without any problems. I also added my user to the groups tty and dialout.

How do I connect to my Arduino using Python?

Answer 1

list the serial ports first. I'm not sure dev/tty.usbserial is correct.

You try do ls /dev/tty* in Terminal, pehaps your Arduino board will pop up as ttyACM0 or something like that(sorry, haven't used Ubuntu in a while).

You can also check out the PySerial finding ports article(may need PySerial 2.7 or newer)