LCD Addon for Beagle.

Hi All,

I have been playing with beagle board for last couple of months, I have missed the ability to take it around and show it to the people as stand alone board as we have no LCD display. I put together a display board , attached pictures.

I have Rev B6 so used DVI receiver, but now rev C supports LCD bus, this board can be easily configured to use LCD bus instead of DVI, Are there people who interested in this LCD panel, I was wondering if could sell it as an add on board to the beagle.

I want your comments and suggestions

Thanks and Regards,
Vijay Jalona

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Nice! What pricepoint are you aiming for?

regards,

Koen

Koen Kooi said the following on 03/05/2009 09:29 AM:

Nice! What pricepoint are you aiming for?

I can think of a few features on such a board, not price points :wink: :
here goes:
* Resolutions: VGA, WVGA, etc..
* Touch screens: resistive (TSC2046 or TSC200x or the like controller)
or capacitive (dunno if this could be bought yet)..
* Backlight control.
* Maybe a few buttons (GPIO based)?
* ambient light sensor?
* oh, a mounted camera would be good.. ;)..

Regards,
NM

Hi NM, Koen,

Thanks for the feedback. Here are the features.

  1. Board is equipped with 640x480 VGA, LS037, currently I got FB driver working Linux 640x480

  2. Touch support through TS2046

  3. Back light control using I2C based PWM. Here again i really wish to use 3530 built in PWM but not comming out on expansion connector.

  4. Few key are supported ( 4 arrows + 1 enter ) and 2 other keys keeping android in mind, but can be expanded if required. Used again I2C expandor

Hmm as of now that’s all, regarding Camera, I want to add but expansion connector limits it.

NM,

I am curious to know about the application of ambient sensor.

Price really depends on volumes ;-), I need to work out.

Regards,
VJ

Vijay Jalona said the following on 03/05/2009 03:30 PM:

I am curious to know about the application of ambient sensor.

Ambient light sensor allows you to control the brightness of the lcd
based on the ambient light in the environment..I have it on my laptop
and it is kinda cool - no strain to the eye :wink:

Regards,
Nishanth Menon

I would be interested. I do not have a Beagle board yet as I am
waiting for Rev C.

I read in the Rev C thread that there was a possibility that PWM
signals would be added to the expansion connector for people using the
board for robotics.

David.

Vijay, I might be interested (depends on price).
Frans

Hi,

Do you have schematics? I would like to see how you convert the DVI-D
to paralle.

I just finally got around to hooking at tfp401a up to convert DVI-D to
parallel.. but I am having issues.. it works for about 1 second, then
stops working for 6 seconds.. then repeats.

Sean

Rev C2 does have the PWM signals available on the expansion connector and it also has the native LCD interface exposd on headers.

Gerald

Thank you,

I am searching for the Rev C schematics and placemet gerber to do the modify the LCD Add-on board. May I get the same. If not complete schematics, I want placement gerber and expansion connector details.

VJ

These will be posted by the end of this week.

Gerald

I´m looking for a drive for WiFi-USB Adapter. Anybody know where to look? My adapter is a MODEL: USB-400.

Where is the indication of the device in Angstrom?

Alessandro

The Rev C2 schematics are now on the web. http://beagleboard.org/hardware/design

Gerald

Hi Sean,

May I know which product are you working? Looks like you have S/W issue
rather than H/W, if the singal comes correct it will not be a issue with H/W

I believe so too. The signals all look correct on the scope, but the
hsync and vsync have the wrong polarity.

I need to release schematics along with the board ( as it stokist will be
selling the boards ), so full schematics will be open in short time.

I am sending you only part of the schematics which converts the DVI to
paralle. If you need any further help send your schematics I review.

I have a similar schematic:
http://digitalsurveyinstruments.com/beagleperiphials/hdmi2parallel/hdmi2parallel_schematic/hdmi2parallel.png

yours may be better mine was quick and dirty, and I think it works,
there are software problems though.

Sean

Thank you Gerald. Will the Gerber files be posted anytime soon. I
would like to know the offset of the new lcd connectors on the board.

Thank you,
Preston

Gerbers will be posted when they are ready. Maybe tomorrow or maybe late next week. There is mechanical data for the LCD connector placement in the SRM.

Gerald

Thanks again. The mechanical information in the SRM is exactly what I
want. I apologize for not looking in the SRM before posting.

Preston

Don’t apologize. Very few people read it anyway!<:^)

Gerald

You wouldn’t know that from the download count. Many times more people download the SRM than actually visit the home page thanks to deep links from other sites.

Hi,

I finally got the psp display working (see screenshots) I have a
crappy camera it isn't blurry.

I have Rev B6 so used DVI receiver, but now rev C supports LCD bus, this
board can be easily configured to use LCD bus instead of DVI, Are there
people who interested in this LCD panel, I was wondering if could sell it as
an add on board to the beagle.

I want your comments and suggestions

I noticed in your schematic you have OCK_INV pulled high. I tried it
both ways on mine, and the picture looks much better when OCK_INV is
low, maybe you can try soldering a switch on and flipping it to see
the difference?

Also a big problem I have is what to do with the DE line. If I
connect it to the tfp401a like you have in your schematic, the lcd
never turns on. If I connect it to vcc (3.3v) then the lcd turns on
and it works, but I have to connect it while the beagle is in uboot.
If I connect this pin after linux has booted, or just leave it
connected at startup Then the display is very light colored, and
hard to read. Has anyone seen this? Does anyone have hints?

Thanks,
Sean

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