RCA to VGA


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by gnomepickle » Fri Aug 24, 2012 4:18 pm
Hi All,

The other day I was at MicroCenter and saw they had a 15 inch HP monitor on clearance sale for a whopping $25. Needless to say I picked it up, but when I got home I noticed it ONLY has VGA input (which makes sense as it was $25). I ended up ordering one of these:

http://www.amazon.com/Cables-Unlimited-AUD-2350-S-Video-Adapter/dp/B000V6W7ZY/ref=sr_1_2?ie=UTF8&qid=1345824796&sr=8-2&keywords=rca+to+vga

My question is, do you think it will work? I figured it was worth a shot as I'll have like $28 invested in a monitor and converter if it all goes well. Even if it doesn't work I have use for the monitor elsewhere, but I was really hoping to use it for my Pi.
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by Jim JKla » Fri Aug 24, 2012 4:22 pm
Keep us in the loop ;)
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by Joe Schmoe » Fri Aug 24, 2012 4:48 pm
I think the CW is that you want HDMI -> VGA, not RCA -> VGA.

The video quality of the later route will be horrid.
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by Mortimer » Fri Aug 24, 2012 5:59 pm
Gnomepickle that converter won't work. I would be willing to bet that the converter is designed for some sort of PC graphics card, in which the VGA socket can be reconfigured to output S-Video/Composite video. There is nothing in that picture of that cable that leads me to believe it contains the active circuitry that would be required to do this otherwise.

And as Joe says, what you really should be looking for is an HDMI to VGA converter, as this will give you the best picture possible.
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by gnomepickle » Fri Aug 24, 2012 7:56 pm
That's exactly what I was thinking about when I noticed the VGA input on the monitor, but those converter boxes normally run you $50+ which I just can't justify spending considering the RasPi didn't even cost that. The main reason I've been trying to find something to work with the RCA input anyway is because I'm using the Pi for interactive fiction development (which does not require a high res display by any means). I had the Pi plugged in to my old big screen and it (mostly) worked but the picture would always be slightly larger than the screen, which caused problems any time I ran certain programs.

I figure I'll plug it in and see what happens. If it works, great! If not, it was only $3 and I can still use the monitor to upgrade the horrible manilla behemoth my Ubuntu desktop is hooked up to (LOL). :D

I saw a few 15-20 inch HDTVs on sale for around $75-$80 that I might be tempted to pick up. At least they can also be used as a stand alone television in addition to the Pi's monitor.
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by ghans » Fri Aug 24, 2012 7:58 pm
Did you try overscan settings ?

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by pksato » Fri Aug 24, 2012 9:04 pm
Amazon.com have a lots of HDMI to VGA converter, price starting at $8.96.
http://www.amazon.com/HDMI-Female-Adapt ... 007A2BLKO/

Or on your favorite Chinese store.
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by mahjongg » Fri Aug 24, 2012 9:11 pm
Unless you modify your PI, the PI (and probably its PSU) cannot deliver the needed power (probably something like 5V 400mA or more) The PI has a diode (D1) which cannot handle the current (its rated 200mA) and also the input fuse of the PI is rated at 750mA, and also cannot handle an extra 400 to 600mA.

The PI needs an adapter with an external power input & adapter.
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by jackokring » Fri Aug 24, 2012 9:27 pm
In effect it needs sync separation and quadrature colour demodulation, and maybe some black magic due to limited sync frequencies of the monitor made to make your pocket leak.

The other option of an old crap non digital CRT TV with composite in is perhaps cheap, although not in running costs of watts.

The HDMI should have simple colour and sync wiring, but perhaps doesn't due to the need for manufacturers to make you pocket leak, and land fill sites to grow bigger to keep the poverty stricken happy sorting for junk in the pollution. What would they do without us?
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by pksato » Sat Aug 25, 2012 3:20 am
Converting composite video (CBS/NTSC/PAL) to VGA is not simple task.
Need to store one line and replay a twice speed (640x480@60Hz).
Some FPGA can done it easy.
Or, using discrete (not so) logic:
http://elm-chan.org/works/sc/report.html

More convenient to buy one:
http://www.dealextreme.com/p/composite- ... v-ac-28534

HDMI to VGA is more cheap (see comments about r-pi).
http://dx.com/p/hdmi-v1-4-male-to-vga-f ... 5cm-130458

HDMI 5V power line is rated at 50mA (250mW).
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by gnomepickle » Mon Aug 27, 2012 6:02 pm
pksato wrote:Converting composite video (CBS/NTSC/PAL) to VGA is not simple task.
Need to store one line and replay a twice speed (640x480@60Hz).
Some FPGA can done it easy.
Or, using discrete (not so) logic:
http://elm-chan.org/works/sc/report.html

More convenient to buy one:
http://www.dealextreme.com/p/composite- ... v-ac-28534

HDMI to VGA is more cheap (see comments about r-pi).
http://dx.com/p/hdmi-v1-4-male-to-vga-f ... 5cm-130458

HDMI 5V power line is rated at 50mA (250mW).


Hmm, I may have to try the HDMI to VGA converter, and $20 isn't too bad if it's something that will work. I feel like such a noob haha, video isn't really my forte.
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by Mortimer » Mon Aug 27, 2012 7:35 pm
Some of the HDMI to VGA converters are not able to have an external power source connected to them, which means they try and draw power from the HDMI socket on the Raspberry Pi. I have tried one such device (A HDFury1 1080p converter) and it can do either, but it refused to power up without the external source plugged in.

There is a potential solution though... voilá : http://www.cablestogo.com/product.asp?c ... &sku=42223
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by Mortimer » Tue Aug 28, 2012 2:32 pm
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by redhawk » Tue Aug 28, 2012 2:56 pm
24 quid for a HDMI power supply is a rip-off when you can buy a HDMI to VGA + power supply for about the same price - http://www.ebay.co.uk/itm/1080P-PC-HDMI ... 0929883993

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by Mortimer » Tue Aug 28, 2012 3:06 pm
I agree, but if someone has mistakenly invested in a converter that doesn't allow a external power supply to be connected, this may help in rescuing some value from that investment. I imagine that for the engineers amongst us, with some electronics skills, cutting open a short HDMI cable and splicing into the power supply line would be the way to go in that situation.
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by gnomepickle » Thu Aug 30, 2012 1:31 am
Well, I decided to abandon whatever I was trying to do because I found a HDMI to DVI converter at MicroCenter for about $5. One of my friends had an extra monitor laying around that supports DVI and viola, it works! :lol:

Thanks for the suggestions anyway. Everyone was very helpful as always. :D
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by gnomepickle » Fri Aug 31, 2012 4:14 pm
Just an update to round off the topic. You guys were right; the original adapter I bought to convert RCA to VGA didn't do much of anything. I got a bit of static on the screen and them the monitor went to sleep...

So what have I learned? If you can't get a HDTV with HDMI input, just find a monitor with DVI input because a HDMI to DVI adapter works great and costs less than $10 :D
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by Jim JKla » Fri Aug 31, 2012 5:05 pm
A TV with a Scart or a Phono AV input or Both are also viable options ;)
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by C-Fu » Wed Jan 30, 2013 3:53 pm
Might be a bit too late, but this thing works, and it's only around RM15 (USD5) here in Malaysia.

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by Mortimer » Wed Jan 30, 2013 6:36 pm
What is that product C-Fu?

Any links to manufacturer and retailers?
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by benjiboy » Tue Mar 25, 2014 6:40 am
Hi Gnomepickle,
I hope you're still monitoring this thread. I want to set my Pi up form Interactive fiction development too, but am a complete linux newb. Can you tell me how to do it, please?

Thanks,

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by redhawk » Tue Mar 25, 2014 10:34 am
I believe some old VGA monitors had TV input capability but it wasn't part of the VGA standard so the cable only option simply won't work on most.
To use a VGA monitor on the Pi you need a converter box and since the Pi supports HDMI then get a HDMI to VGA converter preferably with an external power supply.

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by benjiboy » Tue Mar 25, 2014 6:05 pm
Hello Richard,
was your post in reply to mine? If so you have misunderstood my question. I was hoping the original poster could give me some guidance is installing interactive fiction authoring software under Raspbian, (see one of his later posts to this thread). A bit off the original topic, I accept, but I've not found the information elsewhere. . .

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by redhawk » Tue Mar 25, 2014 6:09 pm
Nope sorry it was in response to C-Fu rather cryptic post regarding his VGA cable with composite lead.

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by pygmy_giant » Tue Mar 25, 2014 7:48 pm
Found this: Expansion Board that allows VGA output and RS232 serial and other bits and bats:

http://www.dx.com/p/expansion-board-made-for-raspberry-pi-multicolor-black-278750?utm_source=dx&utm_medium=edm&utm_campaign=en20140325geekgifts#.UzG2ls5nS8w

link may break if DX move product
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