EEVblog Electronics Community Forum
Electronics => Microcontrollers => Topic started by: legacy on December 10, 2013, 06:07:41 pm
-
I am trying to build a Spinning aka POV (Persistence Of Vision) Display
P.O.V., Persistence Of Vision
A class of display device described as "POV" is one that composes an image by displaying one spatial portion at a time in rapid succession (for example, one column of pixels every few milliseconds). A two-dimensional POV display is often accomplished by means of rapidly moving a single row of LEDs along a linear or circular path. The effect is that the image is perceived as a whole by the viewer as long as the entire path is completed during the visual persistence time of the human eye. A further effect is often to give the illusion of the image floating in mid-air. A three-dimensional POV display is often constructed using a 2D grid of LEDs which is swept or rotated through a volume. POV display devices can be used in combination with long camera exposures to produce light writing.
that should look like this
(http://hackedgadgets.com/wp-content/mb_rgb4.jpg)
In order to do that (hopefully with a better mechanical stuff) i need a good motor able to rotate the led-array, and more specifically i need a flat motor able to rotate at 1400 rpm at least.
mechanically i think i need something like this
(http://www.agse.it/immagini_nuovoshop/ipertronica/75013.jpg)
CAPSTAN MOTOR PU-60201V
unfortunately there is no electronic onboard and i am not able to find its documentation
1) wandering if this kind of motor could be driven by a common hobby-ESC
2) wandering if there are better solutions around
what do you think ?
-
(http://www.kerrywong.com/blog/wp-content/uploads/2010/08/POV_3.jpg)
it may be i am thinking about an other arduino or such a MPU-addicted project (http://www.kerrywong.com/2010/08/19/pov-and-pov-image-encoder/) (arduino Atmega328 project inside) ;D
-
Since it's a capstan motor from a JVC VCR, Google "JVC VCR repair" or "JVC VCR schematics". Worth a try.
Will
-
Old floppy drive will have a motor and board as the drive motor. Single board that generally has a 4 wire connection to the main board. One is either 5v or 12V, one is ground and the third is an enable with the fourth being a tacho signal to the main board. Flat, very simple and cheap to get and will likely have the signals marked on the board. Take the whole plate out ( often it is a single plate held in by 3 screws) and there you have a nice motor. 5 1/4 in drives are generally best as they have a more powerful motor to turn the disk in the sleeve, but most of the 3 1/2 in drives have it on a single plate while the 5 1/4 tend to have a chassis with the motor on it. You might have to do some trimming or make a cover for the whole chassis to cover it.
-
Consider using a regular 120-140 mm computer fan. The better quality ones have enough torque to spin that pcb with no problems.
If you're careful you can cut away some of the plastic and still have a good base for the motor.. and you also have a nice way to adjust speed using either direct voltage or a pwm pulse.
-
here (http://www.elektronika.ba/779/pov-propeller-clock-build/3/) it is an other example of POV
-
:P (https://www.youtube.com/watch?v=cQhBm_EgB0w#t=28)
that's incredible (you tube video) !
-
that (http://wingzero.ath.cx/index.php?page=flying-volt-meter)'s also interesting, "flying-volt-meter" made with a VCR motor.
-
How about using the motor from a hard drive? Those are very flat as well.
-
yeah, it may be cool, just wandering if i can control a modern hard drive's motor with an ESC.
-
yeah, it may be cool, just wandering if i can control a modern hard drive's motor with an ESC.
Lots of good info here: https://www.eevblog.com/forum/beginners/what-to-do-with-a-hdd-motor/ (https://www.eevblog.com/forum/beginners/what-to-do-with-a-hdd-motor/) thanks to free electron and others.
-
and here (https://www.eevblog.com/forum/suggestions/best-way-to-drive-a-spindle-brushless-motor-from-a-hdd/) it is more informations about BLDC and ESC ;D
-
i did a bit of experiments, good result with miniBLDC and BLDC i got form 2.5" and 3.5" hard drive.
In order to control them i used a 20A ESC with home made pwm generator =P
-
(http://imageshack.us/scaled/landing/7/d2ee.jpg)
this is a mini BLDC i got from a 2.5" hard disk, i reversed it as 3 phases + a common signal, and it is working with a 20A ESC ;D