Error with mymotor class

[broncosfan18]

Hi @cavenel,

I ran the program and recieved the following error:

robot@ev3dev:~/ev3-print3rbot$ python writer.py Traceback (most recent call last): File "writer.py", line 10, in class mymotor(motor): NameError: name 'motor' is not defined

Does this have to do with the update that @melonhead2 was requesting in an earlier issue or is it a problem on my end?

Thanks!

[cavenel]

Hi @broncosfan18,

It is possible that this is the same issue as @melonhead2. Unfortunately, I did not have time to change the bindings, plus ev3dev is going through some major changes in the motor class these days. Thus I don't fill like changing everything now and again in a couple of weeks. I don't have the robot built right now!

Thus you could try to use an older version of ev3dev, or to adapt the code yourself. I can help and give advice if you go for option 2!

Bests,

Christophe

[cavenel]

First thing to change would be:

from ev3dev import *

in

from ev3dev.ev3 import *

But you will have other adjustments such as touch_sensor into TouchSensor and some motor functions.

[broncosfan18]

I am fairly new to Linux, but will try my best to update it, as long as you are willing to walk me through it. Do you suggest I open an issue on the main ev3dev site to get support from the other developers or do you think that you can sufficiently help me? Let me know, and thanks!

[cavenel]

As the issue is only about this project and not about ev3dev, I don't think they would like you to open an issue there :) I can try to help here! Do you know how to edit a file on the brick?

On Thu, Jan 21, 2016 at 5:59 PM, broncosfan18 notifications@github.com wrote:

I am fairly new to Linux, but will try my best to update it, as long as you are willing to walk me through it. Do you suggest I open an issue on the main ev3dev site to get support from the other developers or do you think that you can sufficiently help me? Let me know, and thanks!

— Reply to this email directly or view it on GitHub https://github.com/cavenel/ev3-print3rbot/issues/9#issuecomment-173634369 .

[broncosfan18]

I have learned how to do edit a file at some point, but after fiddling around with it for a bit, I can't seem to remember.

[cavenel]

OK, what system do you use on the computer? Windows or Linux? Le 22 janv. 2016 03:50, "broncosfan18" notifications@github.com a écrit :

I have learned how to do edit a file at some point, but after fiddling around with it for a bit, I can't seem to remember.

— Reply to this email directly or view it on GitHub https://github.com/cavenel/ev3-print3rbot/issues/9#issuecomment-173786688 .

[melonhead2]

Windows On Jan 21, 2016 10:43 PM, "cavenel" notifications@github.com wrote:

OK, what system do you use on the computer? Windows or Linux? Le 22 janv. 2016 03:50, "broncosfan18" notifications@github.com a écrit :

I have learned how to do edit a file at some point, but after fiddling around with it for a bit, I can't seem to remember.

— Reply to this email directly or view it on GitHub < https://github.com/cavenel/ev3-print3rbot/issues/9#issuecomment-173786688> .

— Reply to this email directly or view it on GitHub https://github.com/cavenel/ev3-print3rbot/issues/9#issuecomment-173819045 .

[broncosfan18]

I use Windows (10) as well

[iWildStyle]

Hi. I have same problem. Trying to build old version python-ev3dev, but unsuccessful. With current version after I changed from ev3dev import * to from ev3dev.ev3 import * and class mymotor(motor): to class mymotor(Motor): i've got:

robot@ev3dev:~/ev3-print3rbot$ ./writer.py
Traceback (most recent call last):
  File "./writer.py", line 485, in <module>
    main()
  File "./writer.py", line 476, in main
    wri = Writer(calibrate = True)
  File "./writer.py", line 78, in __init__
    self.calibrate()
  File "./writer.py", line 90, in calibrate
    self.mot_lift.rotate_forever(speed=-50, regulate='off')
  File "./writer.py", line 28, in rotate_forever
    self.stop_command = stop_command
  File "/usr/lib/python2.7/dist-packages/ev3dev/core.py", line 578, in stop_command
    self.set_attr_string('stop_command', value)
  File "/usr/lib/python2.7/dist-packages/ev3dev/core.py", line 216, in set_attr_string
    self._set_attribute(attribute, "{0}".format(value))
  File "/usr/lib/python2.7/dist-packages/ev3dev/core.py", line 204, in _set_attribute
    self._attribute_cache.write(abspath(self._path + '/' + attribute), value)
AttributeError: 'mymotor' object has no attribute '_path'
Exception AttributeError: "'mymotor' object has no attribute '_path'" in <bound method mymotor.__del__ of <__main__.mymotor object at 0xb67b3f70>> ignored

@cavenel, please help me to solve this problem

[iWildStyle]

Bingo! I found solution! I just check motor init section and set correct port for all motors self.mot_A = mymotor(OUTPUT_D) self.mot_B = mymotor(OUTPUT_A) self.mot_lift = mymotor(OUTPUT_C) self.touch_A = TouchSensor(INPUT_3) self.touch_B = TouchSensor(INPUT_2)

[broncosfan18]

Hi @iWildStyle, Is there anyway that you can talk me through the process of how to make those changes? I would really appreciate it if you have the time to help me. Is it changes that I make on the brick, or in another program? Thanks a bunch!

[iWildStyle]

HI @broncosfan18, I'm just changed from ev3dev import * to from ev3dev.ev3 import * and class mymotor(motor): to class mymotor(Motor): as described above. And replace touch_sensor to TouchSensor. Exception AttributeError: 'mymotor' object has no attribute '_path' Exception AttributeError: "'mymotor' object has no attribute '_path'" in happens because I'm connect motors improperly.

All changes I made in writer.py on a brick. You need connect to your EV3 as described here: http://www.ev3dev.org/docs/tutorials/ in section Networking. I'm connected via USB. After that, I'm install Midnight Commander apt-get install mc to manage and edit files on a brick.

[broncosfan18]

Thank you @iWildStyle! That totally worked to correct the errors.

After running the program, I ran into some issues. During the running the program ./writer.py the robot successfully wrote "Ceci est un test". However, the arm that lifts and lowers the pen didn't move. When I first started the program, the arm spun around 180°, and then whenever the arm should have moved, I just heard a light hum. Is there a way that I can prevent the arm from moving at the beginning, and change the distance during the rest of the program so that the arm actually moves?

Secondly, when I tried to use the mouse as input, I got this error:

wri = Writer(calibrate = True)
-bash: syntax error near unexpected token `('

Do you know how to correct this?

Thanks for all your help!

[cavenel]

Thank you @iWildStyle for correctiong the code to follow the API! And sorry for not having the time to look that through :-(

@broncosfan18 please open a new issue as this is not related to the first one and the issue will be solved as soon as I include the code from @iWildStyle

(and when you open the new issue, please put a bit more code so that we can understand where the error comes from)

[cavenel]

If someone can check if the last commited version is good, then I can close this issue :)

[iWildStyle]

@cavenel, according instruction (https://www.dropbox.com/s/5jtnpaf18ibalj0/ev3_Print3rbot.pdf?dl=1):

Connect left large motor to port C, right large motor to port A, and small motor to port B. Connect left touch sensor to port 2 and right touch sensor to port 3.

correct code for init motors will be: self.mot_A = mymotor(OUTPUT_C) self.mot_B = mymotor(OUTPUT_A) self.mot_lift = mymotor(OUTPUT_B)

[cavenel]

Thank you, I trusted your previous message :-p Code updated and commited.

[iWildStyle]

@cavenel, ok. I'll check your code tommorow. @broncosfan18 - motor with "arm" to manipulate pen have self-tuning finction. It is trying to rotate until it can do it, After the stop arm and pen is up, motor reset your position to zero. Two functions: pen_up and pen_down move "arm" and pen in corresponding directions. You may comment code (lines 89-100 in writer.py) to skip "arm" adjustment - set it manualy in correct position. To skip drawing svg and directly going to mouse mode you need comment line 477 (wri.draw_image(image_file = 'images/test.svg',max_speed=50)) and uncomment next line (#wri.follow_mouse()) Also you may need pass 1 string parameter to this function - mouse device on you brick (e.g. wri.follow_mouse("/dev/input/by-id/usb-0461_USB_Optical_Mouse-event-mouse"), you need connect mouse and check (run ls /dev/input/by-id/ to display mouse name) correct name in your system, name depends on mouse type.

[cavenel]

For the pen up problem, you can check my answer on https://github.com/cavenel/ev3-print3rbot/issues/3 as well. It could give you some ideas to fix the problem. From what you say, I think the arm isn't stopped in the calibration process, which means you have a problem in the way you built that part (instruction number 8 in the instruction pdf file is very important, as well as the roundish pin in instruction number 9.2)

[iWildStyle]

@cavenel writer.py is correct.

[cavenel]

Thank you! For all other problems we can go on new issues so that other users can follow.