In one of my projects we use a USB-->parallel interface chip.  You can use
the slave port on any 8 pins on the pic as a bi-di parallel port.  The PC
communicates over USB as far as it knows.  You can get up to 115 kilobytes
per second over the parallel in this way.  But, the chips costs about $2.50
each.  MChip should put hardwre USB on their chips already!!!! What are they
waiting for?

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Hartung, Greg
Sent: Thursday, July 19, 2001 5:17 PM
To: PICLIST@MITVMA.MIT.EDU
Subject: [EE]: CCD (to PIC) to USB?


   I wasn't going to start this yet, but since someone started talking about
digital cameras, I couldn't resist.  I am photographer doing mostly large
format.  The cost of a commercial digital back for a 4x5 camera is about
$25k +/-.  I did some poking around Kodak's site for CCD's, but cost for
quantity 1 is also outrageous.  So I was just wondering if anyone could
suggest a good starting point.  Doesn't even have to be PIC based (outrage!
I know) but CCD to USB of some sort would be fun to do.  Looking for a CCD
project that doesn't involve a huge chipset to implement that could be used
as a learning stepping stone to a higher end color project for the camera.
Also wanted to make it modular enough to use for astrophotography as well,
but that's more opto-mechanical than EE.
   Are there CCD interface standards or does every vendor dream up their
own?

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