• POV Display Prototypes

POV Display Devices

Project Summary

• Persistence of Vision LED Display Devices

Bill of Materials

• http://www.mcmaster.com/itm/find.ASP?tab=find&context=psrchDtlLink&fasttrack=False&searchstring=9806T443

• www.nxp.com/acrobat_download/datasheets/74HC_HCT123_4.pdf
  • www.futurlec.com/74HC/74HC123.shtml
• --Chosen Actuator : IBM PN64F8560 Model: DT531B-8I Manufactured by Fuju Electric--
• Sony U-25C Vcr Head, 8 Independent Inductive Signals and 3Phase Brushless DC Motor (what a gem)
• Carbon Fiber Tube
• Received [RGB LEDs] 100X SMD SMT PLCC-4

• Purchased [SMT LED Drivers ] Qty 16 TLC5941RHB Texas Instruments 16-CHANNEL LED DRIVER W/DOT CORRECTION & GRAYSCALE PWM CONTR

• Purchased [DIP LED Driver] QTY 2 TLC5941NT Texas Instruments LED DRVR 16Segment 3V to 5.5V 28-Pin PDIP
• Custom Mechanical/Electrical Systems

Things to do

• Construct Initial Prototype (One LED on a stick)
• add source code
• more pictures / videos
• bill of material
• machine drawings
• transfer algorithms

Software

/Software

Hardware

• BasicX Stamp BX24 http://basicx.com/

• http://www.kinzers.com/don/BX24/

Shopping for Driver

• http://www.marktechopto.com/pdfs/Toshiba/TB718AFG_E050426_P27_LT.pdf

• http://www.marktechopto.com/pdfs/Toshiba/TB62707FG_060614.pdf

• http://www.maxim-ic.com/quick_view2.cfm/qv_pk/4539

• http://findarticles.com/p/articles/mi_pwwi/is_/ai_n17086762

• http://www.maxim-ic.com/quick_view2.cfm/qv_pk/4910 -- Good for dot matrix stuff

• http://datasheets.maxim-ic.com/en/ds/MAX6971.pdf

3-Phase Brushless Electronic Speed Controllers

• Phoenix 25 10c/3sl w/BEC (or 16c/4sl w/o BEC) (www.castlecreations.com)
  • Product Page

    http://www.castlecreations.com/products/phoenix-25.html

  • Manual

    http://www.castlecreations.com/support/documents/Phoenix_User_Guide.pdf

• Programming Instructions
  • Run motorcontrol software on basic X using 112 hz.
    • Turn motor Power off
    • Turn Microcontroller on
    • Set duty cycle to 42%
    • Turn motor power on
    • Single Short Flashes
    • Set duty cycle to 40%
    • double short flashes
    • Set duty cycle back to 42%
    • triple short flashes
    • chirping, beep/flash long pause
    • now in programming mode
  • First Configuration Set (refer to user's manual) (With a little push it spins with mock arm)
    • 1 (default)
    • 2 (default)
    • 3 (5) Disabled Brakes
    • 4 (1) Auto Calibrating Throttle
    • 5 (1) High Advance
    • 6 (2) Soft Cutoff

Existing Patents (from others)

• http://www.patentstorm.us/patents/5748157.html

Tachometer

• Hall Effect (Allegro Hall Effect Switch, to give one rev index and tach.)

  • http://www.allegromicro.com/en/Products/Part_Numbers/3240/3240.pdf

• Infrared
• Photo-Resistive

Radio Communication

• Nice looking radio, cheap, meshing out of the box, low power

NI USB-6008 Multifunctional DAQ Pinouts

References

• Can somebody explain to me how an LED driver works? : electronics

• 555 Timer http://www.kpsec.freeuk.com/555timer.htm

• Cheap LED Dot matrix displays

  • http://www.futurlec.com/LEDMatrix.shtml

• http://ezinearticles.com/?How-To-Drive-A-64-Led-Matrix-Display-Using-16-Control-Lines&id=637573

• PWM IC's

  • http://www.awce.com/pak8.htm?

• Transistors (General Info I found useful, plus I have these great Forrest M. Mims books!!)

  • http://www.tpub.com/neets/book7/25c.htm

  • http://www.kilowattclassroom.com/Archive/Transistor.pdf

  • http://www.colorado.edu/physics/phys3330/PDF/Experiment7.pdf

  • http://en.wikipedia.org/wiki/Flyback_diode

• LED Control Modules and Accessories

  • http://www.controlchips.com/cy308.htm#overview

  • http://www.controlchips.com/cy233.htm#operation

  • http://www.linear.com/pc/productDetail.jsp?navId=H0,C1,C1003,C1094,C1768,P38627 If only we had 16 pwm drivers that were tiny

  • http://www.linear.com/pc/productDetail.jsp?navId=H0,C1,C1003,C1094,C1770,P37747

  • 16-Channel http://datasheets.maxim-ic.com/en/ds/MAX16809-MAX16810.pdf

  • 16-Channel http://www.ortodoxism.ro/datasheets2/a/0sth3q6zylj9i17uxwhkdjd3ijwy.pdf

  • promising 25 channel / cascading devices!!

    • http://www.tranzistoare.ro/datasheets3/maxim/MAX9110-MAX9112.pdf

    • http://datasheets.maxim-ic.com/en/ds/MAX6974-MAX6975.pdf

• Stepper Motor Controllers

  • http://www.controlchips.com/cy545.htm#overview

  • http://www.cs.uiowa.edu/~jones/step/types.html

  • http://www.electronic-circuits-diagrams.com/robotimages/robotckt1.shtml

  • http://www.dontronics.com/stepper.html

  • http://www.elabinc.com/Semiconductors/ProductOverview/tabid/57/Default.aspx

  • http://www.lsicsi.com/StepperDrivers.htm Would like to have less responsibility on the input side though.

• Interesting Components (loosely related stuff)

  • http://www.china-led-manufacturer.com/china/led-full-color-display-led-video-screen.htm

  • http://www.china-led-manufacturer.com/china/led-module-led-strip.htm

Related Work (by others)

• Spoke POV - Persistence of Vision Toy with Kit

• Lots of spinning POV goodness - Hack a Day

• 'This is a hardware mod for a couple models of persistence-of-vision LED clocks, which replaces the original microcontroller in order to equip the gadget with a USB interface.' - Rasterwand - a set on Flickr

• POV display - Open Circuits

• 'LED and POV displays' - Projects - Open Circuits

  • POV display - Open Circuits

• PET-Gaming Computer Module - Hack a Day

  • has link to futurama youtube video

• LED Wave Display - Hacked Gadgets - DIY Tech Blog has contact switch that closes at the swing extrama. the switch appears to control timing.

• Great Rotary LED Project, they almost did everything, including radio comm.

• Slashdot - DIY LED Array Marquee For Your PC

  • This is a relatively simple "flat" bank of LEDs. The comments on the story may be worthwhile, however.

• http://www.slashgear.com/led-persistence-of-vision-watch-2010363.php

• http://www.thinkgeek.com/gadgets/lights/9162/

• http://www.spacewriter.com/Overview.aspx?menuproduct=15

• http://www.google.com/url?sa=t&ct=res&cd=9&url=http%3A%2F%2Fwww.comp.dit.ie%2Fdgordon%2FPublications%2FAuthor%2FLED_Arrays%2Ftech_report.doc&ei=8Ij5R6TeEZDueYrpgJIB&usg=AFQjCNErQHqV5RvubDRQoSG2obbITqQ5mA&sig2=RikwYW9aljb1Q2QggUjvnw

• http://www.ladyada.net/make/spokepov/index.html

• http://www.salient.com.au/LED.htm

• http://www.instructables.com/id/Dance-Messenger/

• http://ezinearticles.com/?How-To-Drive-A-64-Led-Matrix-Display-Using-16-Control-Lines&id=637573

Using Xephyr

• "Xephyr is a real X server which uses the host X server window as "framebuffer" via fast SHM XImages." - /home/tz/Desktop/src/xorg-server-1.6.4/hw/kdrive/ephyr/README

  • pyg c <(tail -n +17 hw/kdrive/ephyr/ephyr.c)

• hostx.c checks XEPHYR_NO_SHM

  • hostx_paint_rect() calls XPutImage()

    • confirmed that hostx_paint_rect() is called by xterm.

      • not by vlc viz unfortunately. neither -nodri nor -fakexa helped

Hooking OpenGL

(II) EXA(0): Offscreen pixmap area of 614400 bytes
(II) EXA(0): Driver registered support for the following operations:
(II)         Solid
(II)         Copy
(II)         Composite (RENDER acceleration)
(II)         UploadToScreen
(II)         DownloadFromScreen
Initialized fake EXA acceleration
(II) AIGLX: Loaded and initialized /usr/lib/dri/swrast_dri.so
(II) GLX: Initialized DRISWRAST GL provider for screen 0