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Author Topic: Polargraph firmware parameters
tmoelich
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Posts: 4
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Theo
Post Polargraph firmware parameters
on: October 23, 2014, 07:51
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Hi, I'm new to Polargraph so please have patience!
In the polargrap_server_a1 (for Uno) the configuration.h file
DefaultStepsPerRev=
Does this mean only motor steps IE 200 or must I compensate for micro stepping IE 1/8 thus 1600?
sandy
Administrator
Posts: 1317
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sandy
Post Re: Polargraph firmware parameters
on: October 23, 2014, 21:31
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Hello, welcome 🙂

This isn't completely straightforward, and it depends on your motor driver.

If you are using an Adafruit motorshield v1, then you are using INTERLEAVED step type, and it's safe to stop on a half-step using this type. So you can multiply your motor steps by 2. So you'd set stepsPerRev to be 400, and your stepMultiplier would be 1.

If you are using a microstepping driver, (or the Adafruit Motorshield v2 in MICROSTEP mode), then it is NOT safe to stop on the in-between steps in that case. It just doesn't work reliably. So you set your stepsPerRev to 200 and your stepMultiplier to 8.

Either way, you do not change the firmware, you send a C30 and C37 command to set the stepsPerRev and the stepMultiplier.

See the guide about setup!

good luck,
sn
tmoelich
Newbie
Posts: 4
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Theo
Post Re: Polargraph firmware parameters
on: October 29, 2014, 07:30
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Hi sn
Many thanks for the response! I got it going as per your explanation
I have another question (sorry)
When I try to print I get a message on the controller software same thing about -
The pen thickness is 1.0 and the grid size is 5 (message then cut off) and the
Does not draw since it has no effect

I think it's something to do with the calibration values; my pen width is 1,0 and I chose the grid size to be 5 - not at all sure if it can word like that...
kongorilla
Pro
Posts: 362
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kongorilla
Post Re: Polargraph firmware parameters
on: October 29, 2014, 22:02
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A pen size of 1 is very thick, and a grid size of 5 is _very_ small. There's not enough room in a pixel that small to draw anything with a pen that thick.

Start with a grid size around 40 or 50 until you get the hang of things.

(Get it? The gondola 'hangs' - it's a 'hanging V' design. HARHAR!). Sorry - I'm such an idiot.
tmoelich
Newbie
Posts: 4
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Theo
Post Re: Polargraph firmware parameters
on: October 30, 2014, 22:41
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Great stuff. Many thanks I tried it and it worked
I drew my 1st picture last night
Thanks for the assistance
Theo
tmoelich
Newbie
Posts: 4
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Theo
Post Re: Polargraph firmware parameters
on: November 1, 2014, 08:53
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Another question
Can one make a drawing without the sig-zag lines IE only the drawing
How I got the drawing on it's way
Open polargraph controller
Connect serial in setup-tab (get Polargraph Ready (Uno)
The I load image file
I select the image area
Set frame to area
Then Render pixels
Choose a option and generate code

I then queue the code and star the print
The polargraph then prints my image

Is there any other way to print?
I also got step changes in the print after about 7 hours of print, not sure why
Will send picture
Theo
sandy
Administrator
Posts: 1317
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sandy
Post Re: Polargraph firmware parameters
on: November 1, 2014, 10:58
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That sounds like the way to draw using the pixel style, yes.
Not sure what you mean though - will wait for the photo!

sn
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