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Author Topic: Scribble MO
Bob
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Posts: 2
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Post Scribble MO
on: June 9, 2015, 10:35
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Hi Sandy et al

I have just completed my polargraph machine broadly following the Instructible. My laser cut sprokets are larger,(24 beads rather than 8, but it seems to be working)

My question is about the way that scribble rendering works. Does it generate fresh code each time the render button is clicked? In other words if I home the pen and then rerun the scribble render without any other alterations to the settings will the pen exactly retrace the first rendering or will it follow a new random path?

Bob
sandy
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Posts: 1317
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sandy
Post Re: Scribble MO
on: June 9, 2015, 11:52
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Hi Bob, the randomness is not actually designed any particular way, so I discovered that the default behaviour of the Arduino's random(...) function is to use a known seed each time. That means that you get the same sequence of random numbers each time - predictable randomness! Same exact path.

http://www.polargraph.co.uk/2013/03/random-scribbles/

If you wanted a more random behaviour, then the number generator needs to be seeded with a different number each time. Not hard to do (sample an unconnected analog pin during setup()), but I've never done it. It wasn't causing a problem for me, so I just left it.

sn
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