Raspberry Pi => VGA


8 posts
by spamurai » Wed Jun 20, 2012 10:06 am
Hi there.
I'm pretty new at all this so please excuse my naivety :oops:

I know the raspberry pi is designed for HDMI connectivity but i was wondering if its possible to connect using VGA?
I've literally just ordered a 17" monitor and didn't even think to check if it had an HMDI port, which know i've learnt it doesn't. It only supports VGA connectivity.

I've done some research before coming here and so far i've found:
1) HMDI - VGA adaptor (relatively expensive)
2) HMDI to VGA cable (relatively cheap)

No one seems to mention a HMDI to VGA cable anywhere, i just know they are available.

What do you guys recommend?

Is it as simple as using a HMDI to VGA cable instead of the HMDI cable?
or will i need to change any setting/code files?

Baring in mind i'm a beginner and it seems i'm already falling at the first hurdle :roll:

I'd appreciate your thoughts and guidance.

Thanks

spamurai
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by jamesh » Wed Jun 20, 2012 11:05 am
There is a LOT of stuff on the forums about this. Try a Google search fomr the front page.

But in short, HDMI->VGA cables don't work (they assume DVI-A support which isn't there). There is a post about a £12 convertor to VGA which people have had some success with.

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by mahjongg » Wed Jun 20, 2012 11:11 am
HDMI to VGA cables only work if there are analog signals on the HDMI port. In the case of the raspberry PI computer there are non, only digital signals, so a HDMI to VGA cable won't work!

If you hadn't bought a monitor yet, I would have recommended you to buy a second hand one with a DVI-D input. The DVI-D input of a monitor accepts the digital signals of a HDMI port, so in that case you indeed only need a cable from HDMI to DVI-D.

If you are stuck with this monitor the only way you can use it with the PI is using a HDMI to VGA converter box, however these are expensive, and also have problems, in essence they convert the HDMI signal to a binary image in RAM, then convert the image again into a VGA signal. Complicated, and expensive, and fraught with all kinds of possible problems.

The Wiki has some examples of relatively cheap converter boxes that work with the PI.
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by spamurai » Wed Jun 20, 2012 11:15 am
Thanks James,
Yes i've been searching around all morning and read various things, some of which contradict each other, hence me finally posting here.
I think the VGA cables that work don't support audio anyway... (without RCA)

Thats handy to know mahjongg, thank you.
Well I've asked to reverse the transaction but am yet to have a response.

Probably just going to have to buy another monitor :(
Might even be easier...
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by JeremyF » Wed Jun 20, 2012 2:00 pm
Once again, (I should probably add this to my signature but...) http://elinux.org/RPi_VerifiedPeriphera ... y_adapters

HDMI-VGA for cheaper than you would expect, confirmed working.
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by penguintutor » Wed Jun 20, 2012 2:12 pm
You do need to use a converter, but this doesn't need to be an expensive converter box.

I currently have my Pi connected to a VGA monitor using a cable with built-in convertor that cost about £15.

See: http://www.penguintutor.com/blog/viewblog.php?blog=6354#vga

VGA does not support audio - so audio will need to be provided through the 3.5mm jack.
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by RaTTuS » Wed Jun 20, 2012 2:19 pm
[quote="spamurai"....
I think the VGA cables that work don't support audio anyway... (without RCA)
..[/quote]
there is no way you can get audio from a VGA lead
in fact HDMI -> DVI-D will not do audio as there is no audio spec on DVI
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by spamurai » Wed Jun 20, 2012 10:07 pm
Well thanks for all the help :D

Fortunately i was given a full refund on the monitor.
I have since brought a 19" lcd tv WITH an HDMI port 8-)

Hopefully, when it arrives, i can finally get started...

Thanks again.
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