Re: Mini VGA Monitor, battery powered

"MetalHead"
> If you can get the VGA direct input, I think you will be a lot happier
> with the results. The RCA jack is NTSC video and NTSC video is really
> lacking on bandwidth. Most of the reason that the ancient computers (or
> webtv) that were designed to display text to a home TV only displayed 40
> characters per line is because NTSC video won't support more.
>
> NTSC color video has the color subcarrier at 3.58 mhz above the luminance
> (video) signal and is the upper video frequency limit. A horizontal line
> is about 63.5 uS long.
> 63.6e-6 * 3.58e6 ~ 227 pixels per line
>
> The color bandwidth is even worse ( <1mhz ). Monochrome NTSC video may
> have up to 6 mhz of video bandwidth. SVGA can use in excess of 100mhz of
> video bandwidth.
>
> Direct connect VGA will be your friend here!
>
> Bob


Yes, that's what I'm gonna do. Let me spend one paragraph explaining what
I'm doing, and perhaps people will chime in with new ideas.

My robot (an autonomous rover) has a mini-itx as a brain. What I'm trying to
do is to have some sort of monitor to that computer for a couple of
different occasions. On my bench, I have a 15 in. LCD monitor, but on the
field, I'd have to have a power inverter to power that monitor. I could do
that, but a 15 inches monitor is not quite portable and it is not really
optimized for battery power. So the first use would be to set up and make
small adjustments to my robot while field testing, and for that I plan to
use the VGA capabilities of the LCD screen. The second use is as a real time
monitor. While running the rover won't have any monitor (of course), but as
my mini-itx board has video out (RCA) by default, I was thinking in
transmitting that feed to the monitor using its video in input. I also have
wi-fi on board, so perhaps I will use it for remote monitoring instead of
using the on board video out.

Is there any VGA transmitter/receiver available on the market (a cheap one)?

Cheers

Padu


.

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