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#354964 - 17/09/2012 15:48 RaspberryPi display extender
tonyc
carpal tunnel

Registered: 27/06/1999
Posts: 7058
Loc: Pittsburgh, PA
I stumbled on this while searching for empeg remote display projects. Not sure how easily it could be adapted to other displays for in-car use, but it certainly looks promising.

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- Tony C
my empeg stuff

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#354966 - 17/09/2012 15:58 Re: RaspberryPi display extender [Re: tonyc]
Phoenix42
veteran

Registered: 21/03/2002
Posts: 1360
Loc: MA but Irish born
Perfect! Now people no longer need to tailgate me to see what I'm listening to smile
Reminds me of this.

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#354967 - 17/09/2012 16:18 Re: RaspberryPi display extender [Re: tonyc]
pca
old hand

Registered: 20/07/1999
Posts: 1084
Loc: UK
Ha. That's funny, I was going to post about the display a friend of mine had built using one of my spare RPIs, and you beat me to it!

It looks much nicer now that he's painted it black and tweaked the code. We had it at the Bristol Raspberry Pi Jam last month. He still needs to get the 2BPP grey level working, but claims it's only a matter of time...

It uses a modified kernel broadcasting the frame buffer data from the empeg over UDP, and a receiver program on one or more Pi units that takes the data in, reformats it appropriately, and drives the display.

Pca
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Experience is what you get just after it would have helped...

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#354969 - 17/09/2012 16:27 Re: RaspberryPi display extender [Re: pca]
tonyc
carpal tunnel

Registered: 27/06/1999
Posts: 7058
Loc: Pittsburgh, PA
Yeah, it just happens to be an itch I need to scratch at the moment, as even the display extender requires you to mount the somewhat bulky display + receiver unit somewhere. Obviously there's still the matter of button input, but that's a tractable problem.

Hopefully he gets the time to post some more details, kernel patches, etc. at some point. Can the RPi deal with the random power losses that happen with in-car use?
_________________________
- Tony C
my empeg stuff

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#354970 - 17/09/2012 17:03 Re: RaspberryPi display extender [Re: tonyc]
pca
old hand

Registered: 20/07/1999
Posts: 1084
Loc: UK
The RPI can barely cope with the random power fluctuations caused by using it, in my experience wink That said, with a suitable 5v PSU it should be OK.

He's working on implementing buttons, we're thinking of making a giant size empeg front panel as a scale model, with working buttons and rotary knob. He really wanted to make the thing twice the size, but that would have been silly. A little over a meter wide, on the other hand, is perfectly normal smile

pca
_________________________
Experience is what you get just after it would have helped...

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#354973 - 17/09/2012 17:28 Re: RaspberryPi display extender [Re: pca]
tonyc
carpal tunnel

Registered: 27/06/1999
Posts: 7058
Loc: Pittsburgh, PA
It's awesome that you guys are doing this stuff. Can't wait to see what it looks like when it all comes together.

Shine on, you crazy diamonds!
_________________________
- Tony C
my empeg stuff

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#354977 - 17/09/2012 20:17 Re: RaspberryPi display extender [Re: pca]
tfabris
carpal tunnel

Registered: 20/12/1999
Posts: 30694
Loc: Seattle, WA
*BOGGLE*
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Tony Fabris

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#354979 - 17/09/2012 21:00 Re: RaspberryPi display extender [Re: pca]
mlord
carpal tunnel

Registered: 29/08/2000
Posts: 13564
Loc: Canada
Originally Posted By: pca
He's working on implementing buttons


Has he ever seen the Hijack web interface with the .css stuff added? It already does all of that, and using bits of it could save him some effort.

Cheers

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#355001 - 18/09/2012 20:37 Re: RaspberryPi display extender [Re: pca]
andym
carpal tunnel

Registered: 17/01/2002
Posts: 3977
Loc: Manchester UK
Originally Posted By: pca
The RPI can barely cope with the random power fluctuations caused by using it, in my experience wink

That's interesting, mine is bordering on unusable due to stuck keys. It's apparently a power thing.
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Cheers,

Andy M

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#355647 - 12/10/2012 16:56 Re: RaspberryPi display extender [Re: andym]
mlord
carpal tunnel

Registered: 29/08/2000
Posts: 13564
Loc: Canada
The power requirements are low enough you ought to be able to solve the "power fluctuation" issues with a suitably large capacitor on the (12V) input to the (buck) 12DC-to-5VDC power supply (pre-made circuits on eBay for under $2 delivered).

Or maybe run it off a rechargeable Lion battery that charges from the 12V car supply?

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