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Topic: Python -> serial -> Arduino (Read 1 time) previous topic - next topic


Jan 17, 2011, 01:38 am Last Edit: Jan 17, 2011, 10:21 am by Wracul Reason: 1
First:   Im a NOOB.
Second: cant connect python to my com3(usb) where my arduino mega is located.

pyserial 32bit and python 32bit, running on win7 64bit.

Here is the python code and result.

>>>ser = serial.Serial('COMM3', 9600)
ser.write('hello world')

Traceback (most recent call last):
 File "<pyshell#16>", line 1, in <module>
   ser = serial.Serial('COMM3', 9600)
 File "C:\Python27\lib\site-packages\serial\serialwin32.py", line 30, in __init__
   SerialBase.__init__(self, *args, **kwargs)
 File "C:\Python27\lib\site-packages\serial\serialutil.py", line 260, in __init__
 File "C:\Python27\lib\site-packages\serial\serialwin32.py", line 56, in open
   raise SerialException("could not open port %s: %s" % (self.portstr, ctypes.WinError()))
SerialException: could not open port COMM3: [Error 2] Systemet finner ikke angitt fil.
(Norwegian: cant find file)

Am i missing something in the python program or...?


Did i mention i started with python today? :)


Com port names, on Windows, are COMn, where n is 1 to 9. The format changes slightly when n exceeds 9. You have two Ms in the name, not one.
The art of getting good answers lies in asking good questions.

Big Oil

I use linux, my python looks like this:

ser = serial.Serial('/dev/ttyUSB0', 9600)

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