On May 26, 2006, at 11:26 AM, Heilpern, Mark wrote:
> I'm looking to put together a Gumstix/Thumbstix-gs solution and I'm
> interested in advice/feedback people might be able to provide.
> * I'd like to be able to attach a low cost LCD and am interested in
> off-the-shelf solutions to look at. Will I need to provide a driver to
> complete this, or does the Framebuffer support provide everything
> at that end, leaving me to provide the application (tinyx or similar)?
This panel seems to be pretty popular:
might be a bit large for what you want though, relative to the thumb-
gs+gum+netmmc stack. Check out this wiki page:
> * I'm interested in the Thumbstix-gs for this partly due to the
> power-over-USB option. Does USB offer enough power to drive the CPU,
> LCD, and also Ethernet and MMC (through a Net/MMC card) without an
Ethernet draws a surprising amount of power (you can tell it's
drawing power thanks to the not quite egg-frying warmth you can
sometimes get from the SMC chip. If you add an LCD backlight's draw
on top of that, you could easily start pushing 500mA at 5V, which is
the spec limit for USB power.
> * Any other random advice?
audiostix-2 would also work for usb-poweredness (or breakout-gs too)
by adding the ferrite bead to the board which connects the usb to the
power bus. audiostix-2 would obviously add the ability to do audio
in/out as well the the LCD, and breakout-gs would reduce the size
somewhat (depending on the LCD panel you use), though would require a
cable for connection to USB instead of just being thumb-driveable.
As for power draw, we have a drawing-board stage plans in the works
to switch to using the 9118 family of ethernet controllers to replace
the 9111C1 we use now. The 9118's are smaller, and lower power
consumption. No ETA at all yet, but it is on the drawing board. The
next-gen gumstix will likely draw less than the current one too; but
in your setup, I don't think the gumstix itself is going to be the
significant power sink.