Screenshot of my Inkscape optical rotary encoder disc generator with the GRBC menu open
I added support for creating gray encoded absolute rotary encoder disks to my Inkscape extension (original post: Inkscape extension for creating optical rotary encoder discs). More specifically binary-reflected Gray code encoders!
Basically these encoders enable you to get an absolute position of your encoder disk unlike normal rotary encoders which are incremental and cannot give you an absolute angle without knowing previous movements and starting point.
With n number of tracks (and sensors) you will get 2^n number of distinguishable positions. So with say five tracks you could distinguish 2^5 = 32 different positions which would translate to an angular resolution of 11.25 degrees (360/32 = 11.25).
I will most likely add support for single-track gray encoders (Wikipedia: Single-track_Gray_code) next.
Grab the extension from GitHub (see original post for installation instructions!): GitHub: Inkscape rotary encoder disk generator
If you have any comments (or find any bugs) or wishes for additional features, please let me know!
Hi, I followed the instructions and for some reason I am not able to see the extension on inkscape. Any hints/tips?
-Running Ubuntu 13.04
-Inkscape 0.48 – installed with std options.
-copied both files (.inx and .py) to /home/[user]/.config/inkscape/extensions
checked for any related errors on extension-errors.log under /home/[user]/.config/inkscape folder and no error related to encoder_disk_generator.
I am new to inkscape…
Thanks for any help.
Carlos.
Hey! Have you restarted Inkscape? Are your file permissions correct?
Hallo,
your tool seems to be very useful for me, but not able to get some results from it. I have got still error even when I try to input parameters from your screenshot (BRGC tab). This is the error message:
File “encoder_disk_generator.py”, line 10
if angle 360:
^
IndentationError: expected an indented block
I tried to sniff in py code but not very familiar with python and don’t understand context of function ‘calculatePoint’.
Trying on inkscape 0.48.4 r9939
Pleas help if you can.
Are you using the newest version from GitHub? Line 10 in the newest version should be “if angle < 0 or angle > 360:”. The error basically says that the indentation of the code is incorrect but it shouldn’t be so not totally sure whats wrong. What Python version are you using?
Yes I took latest version from GIT HUB but I only copied the code via clipboard, because when I saved the link it saved the code with HTML tags. I can’t find direct link for downloading the py file – not very familiar with GIT HUB.
Could you please send me source files to my email?
At last I got it to work. Nice, very nice, thanks.
Pretty cool, thx