Aha, I don't even know what hardware you're using, which arduino, which driver? What firmware? Weird electronic squeaking or whining (bleeping?) could be microstepping noise. It's normally a good sign.
The straight line drawing algorithm in polargraph isn't very clever, so it does tend to jitter, but I guess that does look a little worse than I'd expect.
Sn
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Re: Stepper motor jitter
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Re: Stepper motor jitter
I figured it out what the issue was.
I am using the Polargraph SD hardware, 1.3.1 firmware and latest Polargraph Controller.
I did a comparison of the my properties file to the default one it comes with and found that the step multiplier was set to 9, i changed back to 8 and has worked fine since.
Thanks for the suggestions and help.
CM
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Re: Stepper motor jitter
I'm confused about how it fixed the problem :) But all's well that ends well!
sn
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Re: Drawbots from around the web
Jeff Leonard
https://www.instagram.com/jeffleonardarts/
https://blog.arduino.cc/2016/06/14/make-masterpieces-with-a-homemade-cnc-painting-machine/
http://jeffleonardarts.com/
https://www.instagram.com/p/BHqnvRABA88/?taken-by=jeffleonardarts
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Re: Norwegian Pixels Sketch
After some hours for searching a way to open svg created by SpiralFromImage without opening Inkscape or Illustrator, i found a solution... With a text editor i found some negative numbers as coordinate... without those "-" character all is fine now. So to do that i've just edited the svg.PDE file and change :
output.print(x); by output.print(abs(x));
and
output.println(y); by output.println(abs(y));
Secondly, to display the SVG, i've just changed the original code by :
void displaySVG () {
clearDisplay();
String svgLocation = outputSVGName;
outputSVG = loadShape(svgLocation);
println("loaded SVG: "+ outputSVGName);
shape(outputSVG, 187, 85, outputSVG.width/2, outputSVG.height/2);
feedbackText.setText(locImg+" was processed and saved as "+outputSVGName);
feedbackText.update();
}
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Re: Norwegian Pixels Sketch
Annnnnyway, many thanx for this prog!
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Re: Norwegian Pixels Sketch
Display of svg in the script, and first test on Little A4 paper...
![Image]()
![Image]()
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Re: Norwegian Pixels Sketch
Other problem i'll try to fix. For the moment i can use the soft one time. Have to close it and start it again to achieve a new treatment.
Will comment all my change, and post it
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Re: PolargraphSD with MEGA + Motor shield V2 + TFT + SD card
Yes please :D
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Re: Drawbots from around the web
I already have an entry for AIKON way back on page one, so this is a rerun of sorts, but Make has a new post about Patrick Tresset and his drawing machines:
http://makezine.com/2016/07/20/artist-spends-a-decade-tweaking-robot-that-draws-beautifully-organic-portraits/
http://patricktresset.com/
https://youtu.be/fdV35-4TkvQ
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Re: live drawing
thank you!
I'll post a video of the finished project when it'll be ready! ;)
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Re: doing R&D for the pen industrie?
Stabilo colour fading longterm study update:![Image]()
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Pen lift wont work
Hey, I'm trying to use the pin lift function but it doesn't work, when connected, the servo slightly moves which shows it isn't stuck but when sending the commands there's no movement.
I also tried 3 other servos with the same result.
anyone knows how do I troubleshot this?
I'm using Uno and sheild V1 (both from Ebay)
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Test image for troubleshoting
Is there a test image that I could run on my polar-graph to get an idea of what's wrong with it?
Currently it seems that I have a few problems (the image is skewed, there are no details and the machine draws out of the paper) and after configuration few times using the tutorials I was thinking maybe there's an image (or a set of images) that I could print and easily figure what's going on here (just like the pen width test).
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Re: Test image for troubleshoting
It'd be great wouldn't it, and I've wanted something like this for ages, but I've never been able to think of a kind of drawing that would reveal something useful.
Any rectilinear shape would reveal miscalibration (ie a square would come out curved), but miscalibration can be caused by a few different things - and the nature of the distortion doesn't tell you which one is the problem.
Roughly speaking, all distortions are symptoms of a mismatch between how the machine is defined in software, and how it is in reality. So, the machine is larger in reality than the software thinks, has different kinds of motors, different sized sprockets or different steps per rev, that kind of thing.
A second class of distortions are about a mismatch in pen position, and these really stem from bad calibration, either an error in the measurement of the home point, forgetting to "set home", or drive-train problems where the gondola has been allowed to move without being told to (weak torque, being pulled or getting stuck).
The problem is that there isn't much different in the symptoms between the two classes of distortions. A curved line that should be straight could mean:
* class 2 distortion, the pen is in a different place to where the controller software, and the machine thinks it is (at least three different potential causes for this, even assuming a perfectly specified machine).
* class 1 distortion, the motors have been defined as 400 steps per rev, when in fact they're 200 steps per rev, or any one of six other key pieces of configuration.
It's very common that the machine is specified perfectly, but the over-excited drawer has simply forgotten to "upload machine spec".
It's pretty hard to diagnose anything except "there's something wrong" with a test image.
What probably _is_ possible, is a kind of interactive process, a sort of "expert system" whereby the system guides you through a series of small steps with an initial assumption of being at home. So it'd draw a straight line across the page, and ask you to measure it, and if it's different from what was expected, then it'd suggest some things that could have caused it.
Until that happens, you've got to do that stuff manually.
One feature that is useful for this is the "draw outline", that will draw a rectangle where you've got your selection area defined.
Another thing I've just thought of (re-reading your message), is are you talking about vector drawing or the pixel styles?
sn
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Re: Pen lift wont work
There's some controls on the "setup" tab in the controller software that change the sweep range - try a few options and run "test lift range". Also make sure you've uploaded your machine spec ("upload machine spec").
Last thing - make sure you've connected the servo the right way around. The signal pin should go to the lightest coloured wire on the servo (white or orange).
sn
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Re: Test image for troubleshoting
Wow didn't expect such a comprehensive response in such a short time, thank you! and I'm drawing pixel styles.
Also I must admit I'm still not sure about what the values of the grid size (and sample area) should be and because I got problems with the calibration I can't be sure if they are right or wrong, are there any pointers on how to know that you're on the right range? I tried to figured it out from the tutorial but couldn't really get a decisive answer as it changes with each photo and I don't know how it suppose to look.
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Re: 433 Mhz for the Gondola
Bluetooth HC05 modules are here. Will test them
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Re: Norwegian Pixels Sketch
All hello! Prompt me how to draw Norwegian style? that for this purpose is it necessary to do? thank you
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Re: Drawbots from around the web
Drawing Pendulum by Petros Vrellis
http://artof01.com/vrellis/works/drawing_pendulum.html
https://youtu.be/qiHDKbsE9tA
found via the Hackaday post about his New Way to Knit:
http://hackaday.com/2016/07/28/computer-designed-portraits-knit-by-hand/
http://artof01.com/vrellis/works/knit.html
![Image]()
https://vimeo.com/175653201
https://vimeo.com/175653201
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