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Old 01-11-2010, 02:17 PM #1
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Default Need some help building a spirograph

I plan to build a spirograph projector using rog's 7 color laser kit. I think I want it to be computer controlled flexmod and a DAC. I'm not exactly sure what a DAC is but I know it is necessary it. Where can I get the flexmods and how many do I need? I also need to know where to get a DAC and what it is.


Idealy I want to be able to switch between the computer controlling the spirograph and using the pre programmed 7 color laser driver.


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Old 01-11-2010, 02:50 PM #2
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Default Re: Need some help building a spirograph

DAC = Digital Analog Converter
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Old 01-11-2010, 03:01 PM #3
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Default Re: Need some help building a spirograph

Thanks. Any idea where I can get flexmods?


Edit: never mind I got it.

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Old 01-11-2010, 04:12 PM #4
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Default Re: Need some help building a spirograph

What you're wanting is not possible with a spirograph. A spiro contains 2-3 motors with offset mirrors which produce spirograph patterns only. Computer control is not possible, and a DAC is not needed.

For a system that can be computer controlled and can produce animations and advanced patterns you'll need to build an X,Y scanner using galvos and lasers which support being modulated. More information on these kinds of systems can be found in the "new to scanners" sticky in this section. A tutorial for building your own DAC using a 5.1ch sound card can be found here.
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Old 01-11-2010, 05:30 PM #5
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Default Re: Need some help building a spirograph

I'd like it to produce animations if possible. I didn't know it wasn't called a spirograph. What is in an x,y scanner? Do you have a rough picture of how to do it?
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Old 01-11-2010, 06:16 PM #6
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Default Re: Need some help building a spirograph

Check here. Also, check out the rest of the site while you're there.. It describes pretty much all you need to know to get an idea of how laser show projectors work..
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Old 01-11-2010, 08:47 PM #7
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Default Re: Need some help building a spirograph

you could also try my guide section www.laser-man.co.uk
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Old 01-11-2010, 08:55 PM #8
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Default Re: Need some help building a spirograph

^Another good resource, yes. Andy certainly knows what's up..
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Old 01-11-2010, 09:41 PM #9
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Default Re: Need some help building a spirograph

I like how Andy refers to me as the guy who knows a lot about 15K scanners on his website. LOL.
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Old 01-11-2010, 09:47 PM #10
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Default Re: Need some help building a spirograph

LOL

you helped me big time when i had those 15k scanners
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Old 01-11-2010, 10:19 PM #11
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Default Re: Need some help building a spirograph

Using DAC to control motor speeds sounds like a fun idea.

Simple spiro patterns like stars, rotating stars, crowns, loops, etc... can be programmed to spin, tumble and throb on command.

I have a little commercial spiro that has music control, it's really neat.
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Old 01-12-2010, 06:58 AM #12
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Default Re: Need some help building a spirograph

Using a DAC to control motors is overkill, and you wont find any software with spirograph support. If you want a computer controlled spirograph, check out the "Arduino", it would be very easy to implement.
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Old 01-12-2010, 07:45 AM #13
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Default Re: Need some help building a spirograph

Quote:
Originally Posted by Things View Post
Using a DAC to control motors is overkill, and you wont find any software with spirograph support. If you want a computer controlled spirograph, check out the "Arduino", it would be very easy to implement.
Maybe overkill, but if someone wanted a simple DAC project, the satisfaction of creating something from scratch, etc... it would be a fun project nonetheless.
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Old 01-12-2010, 10:28 AM #14
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Default Re: Need some help building a spirograph

The original poster doesn't want a computer controlled spirograph at all. He wants an XY scanner but just called it the wrong name.
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Old 01-12-2010, 08:41 PM #15
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Default Re: Need some help building a spirograph

Quote:
Originally Posted by carmangary View Post
The original poster doesn't want a computer controlled spirograph at all. He wants an XY scanner but just called it the wrong name.
Yeah I called it by the wrong name. I really want a computer controlled xy scanner. I need to know where to get the galvos from. I can't find anywhere to buy them from.
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Old 01-12-2010, 08:42 PM #16
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Default Re: Need some help building a spirograph

Quote:
Originally Posted by photonaholic View Post
Maybe overkill, but if someone wanted a simple DAC project, the satisfaction of creating something from scratch, etc... it would be a fun project nonetheless.
That's my other thought. If I can't build the x y scanner I thought it would be fun to build a dac controlled spirograph but as the other poster mentioned there isnt really and software for it. I know about arduino, could that be used to control an xy scanner?
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