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DIY E Reader

:: EPE Chat Zone ­:: ­Radio Bygones Message Board :: » EPE Forum Archives 2010 - » Archive through 08 September, 2012 » DIY E Reader « Previous Next »

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mikeb
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Post Number: 654
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Posted on Monday, 16 July, 2012 - 01:36 pm:   Edit Post Delete Post Print Post    Move Post (Moderator/Admin Only)

Why have all the bright young/old things not built/written a homebrew E Reader?

I know that decoding the pdf, epub and other standards will be a pain, but hey, 'we do it 'cos its there (and we need to pull our hair out over something).

Is it possibly because of the prospect of years behind bars?


rgds

mb
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mikehibbett
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Posted on Monday, 16 July, 2012 - 07:09 pm:   Edit Post Delete Post Print Post    Move Post (Moderator/Admin Only)

Actually I've been working on just that:

ereader

It uses a small £35 FPGA dev board. It hooks up to a PIC to do the user interface and data loading from sd card. To keep things simple, I'm converting pdf documents to bitmaps before storing to the card; the fpga therefore only has to render a bit map. The display is from an old laptop and does 1024 x 768 in 16 bit colour.

Progress stalled due to the raspberry pi :o)

Mike
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mikeb
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Posted on Monday, 16 July, 2012 - 07:18 pm:   Edit Post Delete Post Print Post    Move Post (Moderator/Admin Only)

Thanks Mike - I should have guessed!!

Is the FPGA for speed?

rgds

mb
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mikehibbett
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Posted on Monday, 16 July, 2012 - 07:30 pm:   Edit Post Delete Post Print Post    Move Post (Moderator/Admin Only)

I am the king of unfinished projects :o)

The FPGA is because the display takes an LVDS serial datastream at a frequency of over 200MHz; No PIC can hack that. The Raspberry Pi processor has a built in "full size" LCD display panel driver, but the software to drive it has not been released yet. I'd give the FPGA up in a heartbeat if it were available, as the Pi would be a much better solution...

Mike
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terrym
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Posted on Tuesday, 17 July, 2012 - 03:40 am:   Edit Post Delete Post Print Post    Move Post (Moderator/Admin Only)

So I assume the Raspberry Pi should be able to drive laptop screens from defunct laptops (assuming the screen is ok of course).

Hope so, gives me an idea for a project or two.

TM
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mikeb
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Posted on Monday, 23 July, 2012 - 10:52 pm:   Edit Post Delete Post Print Post    Move Post (Moderator/Admin Only)

Well after a bit of Googling I connected onto the Internet and did a little searching for E Book format converters ....

well this project now seems a doddle to me - just convert all these file formats to ascii text files and blast them to a 4 inch LCD ...

I must be missing something here ...

rgds

mb
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mikehibbett
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Posted on Tuesday, 24 July, 2012 - 08:34 pm:   Edit Post Delete Post Print Post    Move Post (Moderator/Admin Only)

> just convert all these file formats to ascii text

True, but I'm interesting in reading pdf datasheets in bed ( sad, eh? )

I've just got a smartphone with a 4.3" display so the urgency is gone now. At least while my eyesight is 20-20 :o)
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nigelmercier
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Posted on Saturday, 04 August, 2012 - 01:41 pm:   Edit Post Delete Post Print Post    Move Post (Moderator/Admin Only)

"I'm converting pdf documents to bitmaps"

How are you doing that? I need a similar thing for a project I have in mind to use a thermal paper fax machine as a printer.

(Message edited by nigelmercier on 04 August, 2012)
--
Nigel
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mikehibbett
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Posted on Saturday, 04 August, 2012 - 04:30 pm:   Edit Post Delete Post Print Post    Move Post (Moderator/Admin Only)

http://www.overpdf.com/

Or just scan the web for "pdf to bitmap"

Regards,

Mike

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