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From: Ivan Nathvalski on 29 Aug 2005 06:11
Can some USB, microcontroller expert advise me how can a USB webcam be
interfaced with a microcontroller (PIC, ATMega, etc) so that we can capture
image frames (low speed, low res) with the microcontroller?




From: "mark jb" <nukeleer at internode dot on dot on 29 Aug 2005 06:32
> Can some USB, microcontroller expert advise me how can a USB webcam be
> interfaced with a microcontroller (PIC, ATMega, etc) so that we can
> capture image frames (low speed, low res) with the microcontroller?

you'd need a usb host on the board to interface with the micro, power to run
the cam from the board... you may be better ripping a cheap cam apart and
pulling a direct video output before the usb out (if possible)

-mark


From: Roger Hamlett on 29 Aug 2005 10:48

"Ivan Nathvalski" <ivanNath(a)rotolmail.com> wrote in message
news:4312df09$0$22557$afc38c87(a)news.optusnet.com.au...
> Can some USB, microcontroller expert advise me how can a USB webcam be
> interfaced with a microcontroller (PIC, ATMega, etc) so that we can
> capture image frames (low speed, low res) with the microcontroller?
Forget it.
Better just to buy one of the cameras with a video output.
Key thing about USB, is that it is designed to make the 'slave' device
relatively easy to produce. The 'host' device, requires a _lot_ more
hardware and code. It is possible to produce a basic host, but you are
looking at perhaps 5 to 10* as much work as producing a direct video
grabber...

Best Wishes


From: Hans-Bernhard Broeker on 29 Aug 2005 10:58
In comp.arch.embedded Ivan Nathvalski <ivanNath(a)rotolmail.com> wrote:
> Can some USB, microcontroller expert advise me how can a USB webcam be
> interfaced with a microcontroller (PIC, ATMega, etc) so that we can capture
> image frames (low speed, low res) with the microcontroller?

About as well as you could pull a 20-ton cargo trailer up a hill using
a bicycle. You need a USB host for that, which needs between one and
two orders of magnitude more CPU power than what you're envisioning.

--
Hans-Bernhard Broeker (broeker(a)physik.rwth-aachen.de)
Even if all the snow were burnt, ashes would remain.
From: Michael J. Noone on 29 Aug 2005 12:28
Cypress makes some nice little USB host chips - I'd reccomend taking a
look at those as I doubt a 8b micro could handle the complexities of a
USB host interface. Best of luck!

-M. Noone

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