Re: [Lcd4linux-devel] WRAP platform and LCD4Linux

[Stefan K. <ste...@cr...>]

Hi Luis,

Luis.F.Correia schrieb am 17.08.2006 09:59:
>
>> Fine! You are driving the PCB and the LCD from USB? Or do you
>> have a seperate voltage feed?
>
> Everything is powered via the USB port and the LCD does have a LCD
> backlight.

O.K. - how much current does it consume?

> If you want my advice do this, get a standard 7805 voltage regulator,
> remove the SMD one (near the power supply behind the minipci socket
> card and solder there the wires. Then get a good heatsink and away you =
go.

I do not want to directly solder on the WRAP. Nor do the other WRAP users
in the fli4l community want to directly solder on the WRAP. The most of
them don't have the USB expansion - as a consequence not wanting to solde=
r
...

I'm trying all the possibillities - I2C, USB and GPIO for the community,
not for myself alone. And I'll publish my experiences to give everybody
out there the chance to take the best option for themself.

I'm dreaming on a small PCB, plugged head-over onto the J2
(LPC-Expansion), having all needed datalines, a contrast-potentiometer an=
d
a (5V) voltage-booster connected to the front-lcd in my enclosure. I wish
this dream comes true. And this would be the easiest way to have a LCD
connected to a (unsoldered) WRAP - and maybe there are solderers out ther=
e
which sell ready made PCBs for the community.

> How are you powering your WRAP? I mean how much voltage you are supplyi=
ng?

Don't know exactly ... 7.5V or 9V.

>> 1st - programming the Atmel is a problem for anybody out
>> there who hasn't to do anything with Atmels before.
>
> It isn't if you can get them already programmed.

Yes. I hope, Till helps me out of this problem.

>> 2nd - using GPIO on WRAP enables the possibility to put the
>> LCD in the WRAP enclosure. O.K. not into the original one -
>> but my enclosure has enough room on the front to put a 16x2 LCD in.
>
> Not really, although i've chosen to have mine externally, it would
> fit in any enclosure that is bigger then the original (which to me
> is kind of useless since you can't even remove the CF card without
> having to unscrew the board...)

I've a Powertip PC1602-E (measures 66mm x 23mm, datasheet:
http://www.powertipusa.com/pdf/pc1602e.pdf ) - it will fit into my front
panel. Stay tuned, this week I'll order new panels with cutouts for that
LCD.

> As you wish, Lcd4linux is working perfectly with LCD2USB and I2C,
> no need to make any further programming.

Sorry Luis, as mentioned weeks before, the DOG-M modules need special
initializing. And they have software controlled contrast-settings. I want
to make this modules usable by lcd4linux - not for I2C alone.

MfG

Stefan