Trying to make it works, several problems, thank you for help :)

[JP]

Hi all,

First, i m sorry for my bad English!

I just received a Lego NXT Mindstorm Education Base Set and i would to control robot with nxt Python.

I followed different step and tutorial:

 

 

1- Installation:

 

 

I installed : Python 2.7.5

                  libusb-win32-bin-1.2.6.0

                  PyUSB 1.0.0.a3

                  nxt-python-2.2.2

I followed this video tutorial on YT: http://www.youtube.com/watch?v=1nTaI-N0TCs that helps me a lot. I thank the autor.

 

 

2-First problems:

 

 

 i launched, to try something, the spin.py example, and i got the following error:

 

 

 

Host: 00:16:53:40:84:E5 Name: MyNXT Strict: True
USB: True BT: False Fantom: False FUSB: False FBT: False

Traceback (most recent call last):
  File "C:\Python27\nxtControl\examples\spin.py", line 12, in <module>
    b = nxt.locator.find_one_brick(debug=True)
  File "C:\Python27\lib\site-packages\nxt\locator.py", line 112, in find_one_brick
    for s in find_bricks(host, name, silent, method):
  File "C:\Python27\lib\site-packages\nxt\locator.py", line 43, in find_bricks
    for s in socks:
  File "C:\Python27\lib\site-packages\nxt\usbsock.py", line 84, in find_bricks
    for bus in usb.busses():
  File "C:\Python27\lib\site-packages\usb\legacy.py", line 343, in busses
    return (Bus(),)
  File "C:\Python27\lib\site-packages\usb\legacy.py", line 339, in __init__
    self.devices = [Device(d) for d in core.find(find_all=True)]
  File "C:\Python27\lib\site-packages\usb\core.py", line 856, in find
    raise ValueError('No backend available')
ValueError: No backend available

 

So i tried something: i launched the inf wizard of libusb, ( a different way that the one proposed in the video), and i launched spin.py. I Still got a problem.

 

3- Second problem: i got that:

 

Host: 00:16:53:40:84:E5 Name: MyNXT Strict: True
USB: True BT: False Fantom: False FUSB: False FBT: False

Traceback (most recent call last):
  File "C:\Python27\nxtControl\examples\spin.py", line 12, in <module>
    b = nxt.locator.find_one_brick(debug=True)
  File "C:\Python27\lib\site-packages\nxt\locator.py", line 137, in find_one_brick
    raise BrickNotFoundError
BrickNotFoundError

 

I continue to search on internet, and i found this fabulous group, and i followed a topic on this: https://groups.google.com/forum/#!topic/nxt-python/OWBf2QJRAdI. Very interessant. so i tried to create a simple program:

 

#!/usr/bin/env python

import nxt.locator
from nxt.motor import *
b = nxt.locator.find_one_brick(debug=True)

 

and the result is:

 

#!/usr/bin/env python

import nxt.locator
from nxt.motor import *
b = nxt.locator.find_one_brick(debug=True)

 

4-Continuing with problems ^^

 

 

 

As Mr. Marcus Wanner advised in the topic i tried to create a file like this:

 

import usb
for bus in usb.busses():
    for device in bus.devices:
        print device.idVendor, device.idProduct

 

And i get:

1684 5

Then i wanted to verified if this device exists (just to try) and i completed the programm, so i had:

 

import usb
for bus in usb.busses():
    for device in bus.devices:
        print device.idVendor, device.idProduct

dev = usb.core.find(idVendor=0x1684, idProduct=0x0005)
print(dev)

 

and i got:

1684 5
None

 

5-Strange results?

 

I dont understand why the device doesnt exists with these parameters. So i launched from my folder (C:\Python27\modulesNXT\libusb-win32-bin-1.2.6.0\bin\amd64) the following program: "testlibusb-win" and it gaves different id Ventor and product :0694 and 0005

Then i wanted to verify, and create another python program:

 

dev = usb.core.find(idVendor=0x0694, idProduct=0x0005)
print(dev)

and that seems to work:

<usb.core.Device object at 0x02A8D490>

 

But nvm, i m still with this Brick witch is not found :/

 

6-going in the usbsock.py

 

Then, i opened in this folder: C:\Python27\Lib\site-packages\nxt, the following program: usbsock.py

And i saw two lines:

 

ID_VENDOR_LEGO = 0x0694
ID_PRODUCT_NXT = 0x0002

that i modified in:

 

ID_VENDOR_LEGO = 0x0694
ID_PRODUCT_NXT = 0x0005

i saved and launch the spin.py program and i got:

 

 

 

Host: 00:16:53:40:84:E5 Name: MyNXT Strict: True
USB: True BT: False Fantom: False FUSB: False FBT: False
Traceback (most recent call last):
  File "C:\Python27\lib\site-packages\nxt\locator.py", line 119, in find_one_brick
    info = b.get_device_info()
  File "C:\Python27\lib\site-packages\nxt\brick.py", line 27, in poll
    self.sock.send(str(ogram))
  File "C:\Python27\lib\site-packages\nxt\usbsock.py", line 69, in send
    self.handle.bulkWrite(self.blk_out.address, data)
  File "C:\Python27\lib\site-packages\usb\legacy.py", line 148, in bulkWrite
    return self.dev.write(endpoint, buffer, self.__claimed_interface, timeout)
  File "C:\Python27\lib\site-packages\usb\core.py", line 626, in write
    self.__get_timeout(timeout)
  File "C:\Python27\lib\site-packages\usb\backend\libusb0.py", line 495, in intr_write
    timeout)
  File "C:\Python27\lib\site-packages\usb\backend\libusb0.py", line 559, in __write
    timeout
  File "C:\Python27\lib\site-packages\usb\backend\libusb0.py", line 387, in _check
    raise USBError(errmsg, ret)
USBError: [Errno None] libusb0-dll:err [_usb_setup_async] invalid endpoint 0x81
Failed to connect to possible brick

Traceback (most recent call last):
  File "C:\Python27\nxtControl\examples\spin.py", line 12, in <module>
    b = nxt.locator.find_one_brick(debug=True)
  File "C:\Python27\lib\site-packages\nxt\locator.py", line 137, in find_one_brick
    raise BrickNotFoundError
BrickNotFoundError

 

 

 

7- Dont know what to do...

This message is really long, sorry for that, but i think that s this nxt python is really powerfull, and a very nice idea, that s why i would like to use it. But know, after hours trying to install, i dont know what to do... If someone can help, that would be really great!

Im on Windows 7

Thanks in advance.

Regards

JP

 

 

 

 

[hubble...@gmail.com]

Hello JP

I dont know if i can help you with all of yout problems but i can give you tip:

Is your robot really called MyNXT ?

That was one of my first problems.

My NXT is even calles just NXT not MyNXT.

I hope this helps you at least.

Nice Greetings,

Hubble.Pixel

[JP]

Hello Hubble Pixel,

Thank you for this answer!

I ll try this as soon as possible!

Thank you again

Regards.

JP