Hi,
I got a bit bored, so I just typed up some pinouts...
(I never actually posted the LVDS-to-"HDMI" pinouts like this before, so it's handy anyway.)
The LVDS pinouts should be the same on most "Vitrolight" / Realtek / NT68676 controllers,
but you need to double-check the pinout for your particular controller!...
*** Controller LVDS ***.............*** "HDMI" Cable ***
Cont pin 24 (TXE2+)....................Pin 1. LVDS Data2+
Cont pin 25 (GND).......................Pin 2. LVDS Data2 Shield (GND)
Cont pin 23 (TXE2-)....................Pin 3. LVDS Data2–
Cont pin 22 (TXE1+)...................Pin 4. LVDS Data1+
Cont pin 14 (GND)......................Pin 5. LVDS Data1 Shield (GND)
Cont pin 21 (TXE1-)...................Pin 6. LVDS Data1–
Cont pin 20 (TXE0+)...................Pin 7. LVDS Data0+
Cont pin 13 (GND)......................Pin 8. LVDS Data0 Shield (GND)
Cont pin 19 (TXE0-)....................Pin 9. LVDS Data0–
Cont pin 28 (TXEC+)...................Pin 10. LVDS Clock+
Cont pin 26 (GND)......................Pin 11. LVDS Clock Shield (GND)
Cont pin 27 (TXEC-)...................Pin 12. LVDS Clock–
Cont pins 1,2,3 VSEL (3V3)..........Pin 13. VSEL (3V3), Panel power
Cont pins 1,2,3 VSEL (3V3)..........Pin 14. VSEL (3V3), Panel power
Arduino pin A5? (SCL)...............Pin 15. GY-85 SCL
Arduino pin A4? (SDA)...............Pin 16. GY-85 SDA
Arduino GND.............................Pin 17. GY-85 GND
Arduino +5V.............................Pin 18. GY-85 VCC_IN (+5V)
Cont pins 4,5,6 GND.................Pin 19. GND, Panel power Ground.
I'm assuming the GY-85 normally connects directly to the SCL / SDA pins on the Arduino? (pins A5, and A4 respectively on the Duemilanove / Uno / Leonardo ?)
EDIT: Might as well repost this...
Pin 1 on the controller is marked by the small arrow on the PCB (next to the white connector for the keypad).
Pin 2 is then above pin 1, like this...
2-4-6-8-10-12-14-16-18-20-22-24-26-28-30
1-3-5-7-9--11-13-15-17-19-21-23-25-27-29
On some controllers, the PWM / Backlight control pins made be connected to a separate header on the board.
This allows for backlight brightness control, or for disabling the backlight when changing inputs etc.
Pins 4,5,6, and pins 13,14,25,26 on the controller are likely to all be connected anyway, so this gives a solid Ground connection to the panel.
Some panels might use +5V for the panel itself (and +5V, or even +12V for the backlight power), so you'll need to check that too.
If an extra power pin is needed, you should be able to disconnect pin 19 from GND, and use that for the power pin instead (as long as all the other Grounds are connected!).
Using the same pairs of wires for LVDS via the HDMI cable means that they should retain the twists, and should be well shielded.
The SCL / SDA pin pair is probably shielded in most cables too (depends on cable quality / thickness ofc).
Might be best to keep the Ground / power for the Arduino / GY-85 separate from the controller / panel, to minimize any possible interference / ground loops.
(then again, with the PC connected to the Arduino USB and controller's HDMI port, it will all be sharing the same Ground anyway).
Here's an alternative pin usage for the last few pins on the "HDMI" cable (for USB, like Dev Kit's headtracker)...
Pin 13. Backlight ON/OFF + PWM.
Pin 14. USB +5V (Red)
Pin 15. USB Data- (White)
Pin 16. USB Data+ (Green)
Pin 17. GND / (USB Black)
Pin 18. +5V (Backlight Supply)
Pin 19. +3V3 (Panel Supply)
If you leave the HDMI plugs on your HMD extension, remember to NEVER plug either end into a normal HDMI socket!
btw, it may be possible to power your controller / panel via USB +5V as long as the current requirement is low enough.
This is a bit of a grey area though, as some USB ports default to 100mA max until the device requests the full 500mA.
It has been known to work fine for many people though (including that DK teardown vid where they powered it via USB).
I think we'll save that for another day.
OzOnE.
P.S. I really must try this on my Hydis panel soon - after I ordered the Rift, the Hydis just sat here on the shelf with the 5x lenses.