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Re: how to build a drawing machine
Posted: Wed Jul 27, 2011 2:13 pm
by PraveenAlexis
i could find some motors from my old brocken DVD-Rw
Re: how to build a drawing machine
Posted: Wed Jul 27, 2011 7:27 pm
by Neo
New topic added,
How to control Hard Disk motor using a microcontroller
Rksk,
Remember I was talking about the tray motor of the CD ROM. Accidentally I found a video on that. It's a stepper motor.
Ability to control position accurately without a feedback system (such as using an encoder) is a feature in a stepper motor. Since the angle movement per pulse is well defined, it is easily possible to control the angular velocity using a little microcontroller.
[media]http://www.youtube.com/watch?v=dSKac6EPkrc[/media]
Re: how to build a drawing machine
Posted: Thu Jul 28, 2011 1:09 pm
by Neo
Information here are related to donation topic
here.
According to the doc
How it Works.docx, you will need to apply an edge detecting filter to convert the source picture to machine printable drawing. This subject comes under Computer Vision -> Edge detection. I would like to propose either Sobel or laplacian filters.
Source Picture
- original.PNG (118.44 KiB) Viewed 14821 times
Destination machine printable drawing
- sobel.PNG (97.39 KiB) Viewed 14821 times
First you need an image reader (Such as JPG reader) and then apply this sobel filter to get the edges that are ready to be sent to the printer. Finally output the data line by line (called vector graphics).
I can help you to do this since I have done these in past. Let me know.
Re: how to build a drawing machine
Posted: Thu Jul 28, 2011 3:29 pm
by Neo
Keep these circuit diagrams with you guys.
Power supply
Since the motors are 12V, find a 12V / 2A transformer to suit both needs. 7805 will provide essential 5V and power to the uC (microcontroller).
- Power supply.jpg (29.95 KiB) Viewed 14820 times
Stepper motor control with ULN2003
- uln2003.gif (12.27 KiB) Viewed 14820 times
Oscillator & MAX232
- MAX232.jpg (252.53 KiB) Viewed 14820 times
Lots of exiting things to happen
Re: how to build a drawing machine
Posted: Thu Aug 11, 2011 11:00 am
by PraveenAlexis
- motors.jpg (33.9 KiB) Viewed 14794 times
1) The two accells
2) Cartridge Holders
3) Stepper Mortes x 3
4) Normal DC motors x 2
5) Belts x 2
Neo, can you make this pic small
i dont know how to do it
Re: how to build a drawing machine
Posted: Thu Aug 11, 2011 12:56 pm
by Neo
Re: how to build a drawing machine
Posted: Thu Aug 11, 2011 1:22 pm
by PraveenAlexis
shenal is working on the electronical parts, and im working on the structure
shenal have an idea about moving the pen up and down without the stepper, he will explain you when hes done with it,
Re: how to build a drawing machine
Posted: Thu Aug 11, 2011 2:51 pm
by Neo
shenal have an idea about moving the pen up and down without the stepper
I guess he is going to use a solenoid? If that is the case, I think it's a good idea as long as he can control the pen on hitting the paper slowly (using a spring may be) to avoid damage to both paper and pen. We can discuss that later.
im working on the structure
Good luck!!!
Re: how to build a drawing machine
Posted: Sun Sep 04, 2011 10:45 am
by PraveenAlexis
we finished making the structure! Nw we have to do the electronic part! I wish shenal will reply here soon!
Re: how to build a drawing machine
Posted: Sun Sep 04, 2011 1:38 pm
by Neo
A picture is worth a thousand words !!!
Can you update with some pictures.