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X Y Z Plotter, Preferably Hi-Res VGA — Parallax Forums

X Y Z Plotter, Preferably Hi-Res VGA

RickInTexasRickInTexas Posts: 124
edited 2012-10-08 16:02 in Propeller 1
Okay, I know there is a simple Microphone to VGA object that performs an oscilloscope type function but what I would like to put together is a simple X Y Z plotter (just like a standard o-scope set up this way.

Has anyone written such a program for the Propeller?

My interest is in plotting Chua Chaos patterns like:

double-scroll-yz.jpg


I came across this on Hackaday.com which links to: Random Sequence Generator based on Chua Circuit

It is quite interesting in that is uses a fairly simple 4 OP-AMP inductor-less circuit that claims to generate Random sequences of 1s and 0s. The author presents a compelling (to my simple mind) case for generating "truly random" numbers.

I think it would be interesting to run this along side the Props PRNG and the "Real Random" generator based on PLL-Jitter.
double-scroll-yz.jpg
1024 x 384 - 101K

Comments

  • Phil Pilgrim (PhiPi)Phil Pilgrim (PhiPi) Posts: 23,514
    edited 2012-10-08 13:05
    Awhile back I wrote an object that does 3D stereo on VGA:

    It's not exactly hi-res, but there are RAM limits to what the Prop can display.

    -Phil
  • Heater.Heater. Posts: 21,230
    edited 2012-10-08 13:51
    That Chua circuit has given me a desperate urge to fire up a soldering iron and dig out the oscilloscope. Thanks for the link.
    As a random number generator it does seem to be rather slow though.
  • RaymanRayman Posts: 14,670
    edited 2012-10-08 14:11
    Propeller can do some graphics, but not with very high resolution

    The Rayslogic.com DVI Graphics shield will let you do 800x480 graphics in 24-bit color...

    Prop2 should one day allow us to do 1080p graphics...
  • RickInTexasRickInTexas Posts: 124
    edited 2012-10-08 15:22
    @PhiPi - That's just what the doctor ordered. I just loaded up the demos, really nice. There are so many gems hidden in these forums it's hard to find them.

    I created a custom Google search that searches both the current and archived forums. I'll see if I can add it to my sig line. (Not sure how to do this.)
    Google Propeller Forum Search (Includes archived posts and NO minimum Character limit. (Try searching "C" for example)

    @Rayman - That's cool Ray. Going to explore that.

    @Heater - Not the fastest RNG to be sure but it is more fun than avalanche noise et. al.!

    Actually, sampling various nodes and playing with sampling rates, cranking up the oscillation speeds, sampling rates etc are areas ripe for experimentation.

    Honestly, I have no real need​ for this at all but that's what makes it fun. :-)
  • Heater.Heater. Posts: 21,230
    edited 2012-10-08 16:02
    RickInTexas,
    Honestly, I have no real need​ for this at all but that's what makes it fun. :-)

    Exactly.
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