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Forum Index : Microcontroller and PC projects : UBW32-CC
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palcal Guru  Joined: 12/10/2011 Location: AustraliaPosts: 1967 |
I have a 4.3" composite monitor that I wish to connect to my UBW32CC. So I bought a VGA to Composite converter. The converter works fine connecting my computer to the composite monitor and the UBW32CC works fine with a VGA monitor. But when I connect the converter to the UBW32CC and then to the composite monitor,no go. Anyone have any ideas. Paul. "It is better to be ignorant and ask a stupid question than to be plain Stupid and not ask at all" |
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Grogster Admin Group  Joined: 31/12/2012 Location: New ZealandPosts: 9501 |
Most likely that the VGA-composite adaptor does not like the taste of the CMM screen resolution. Most of those adaptors are expecting standard VGA resolutions, and I don't think the CMM is one of those "Standard" resolutions, although, 99% of all monitors can accept the signal none-the-less. I'm curious - the CMM has a composite video output - why not use that? (or is it that you need COLOUR composite, which I don't think the CMM can do) Smoke makes things work. When the smoke gets out, it stops! |
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| palcal Guru Joined: 12/10/2011 Location: AustraliaPosts: 1967 |
T thought I would have a nifty 4.3" colour screen for a project I have. Paul. Edit. If it was some sort of resolution or compatibility issue I would expect to see something even garbage, but the screen is just black. "It is better to be ignorant and ask a stupid question than to be plain Stupid and not ask at all" |
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| Frank N. Furter Guru Joined: 28/05/2012 Location: GermanyPosts: 939 |
Hi Paul, did you have a proper power supply to your adapter? These adapters always needs a separate power. My adaptor works very fine with my UBW32-CMM... Frank |
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| palcal Guru Joined: 12/10/2011 Location: AustraliaPosts: 1967 |
The adapter came with a lead to connect it to USB for power. It works fine if I connect my computer to it but won't work with the UBW32 Paul. "It is better to be ignorant and ask a stupid question than to be plain Stupid and not ask at all" |
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| Frank N. Furter Guru Joined: 28/05/2012 Location: GermanyPosts: 939 |
Hi Paul, did your UBW32 work correct with a VGA monitor? Can you boot your UBW32 first with VGA monitor and then hotplug your adapter on the UBW32? Frank |
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| palcal Guru Joined: 12/10/2011 Location: AustraliaPosts: 1967 |
The UBW32 works fine with my VGA monitor. While it was working I pulled the plug to the monitor and put it in the converter and get nothing. But if I plug my desktop into the converter it works OK. I tried another VGA cable but still the same. It's a bit of a mystery Paul. Edit. Frank What converter are you using, I am using this one Link "It is better to be ignorant and ask a stupid question than to be plain Stupid and not ask at all" |
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| hitsware Guru Joined: 23/11/2012 Location: United StatesPosts: 535 |
Have you tried CONFIG COMPOSITE NTSC ? |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9501 |
Sorry to have to keep repeating this, but from the auction you linked to: CMM VGA is 480 x 432 in standard 8-colour mode, and 240 x 216 in Mode 4. Neither of those CMM resolutions are 640x480, 800x600 or 1024x768, so the converter most likely just won't jive with that resolution. Especially with a $12 adaptor, I would expect that you must comply with the supported resolutions. 
I guarantee that the problem is the converter not liking the taste of the CMM screen resolution. 
For want of a better explanation, and you have already tried all the obvious with your PC etc, if the converter could output a message like an LCD, it would report something along the lines of "Out of range." Here's a quick test you can apply on your PC - Set your PC's screen resolution to something other then what the converter supports - say something LOWER then 640x480, and see if the converter still works - I'd be interested to hear the results of that test. 
I used to have some Dick Smith VGA converters around the place - I will see if I can find one, hook it up, and see what I get. Smoke makes things work. When the smoke gets out, it stops! |
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| palcal Guru Joined: 12/10/2011 Location: AustraliaPosts: 1967 |
When configured to composite it is Black and White. I am trying to convert the colour VGA to colour composite. I measured the voltage on pins 1,2,3 (RGB) of the VGA connector on my computer at about 0.8V ,at the socket on the UBW32 it is only about 0.06V a big difference but it still works with the VGA monitor. Maybe the converter needs a higher signal level than the monitor. Paul. "It is better to be ignorant and ask a stupid question than to be plain Stupid and not ask at all" |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9501 |
That is indeed quite possible. I will have a hunt for my DSE converter now, and I will post back with the results I get at my end. EDIT: Can you alter your PC resolution and run that test to see what happens? That would rule out the voltage difference. Depending on your PC, setting to below 1024x768 might not be permitted, but you could set a resolution higher then the maximum supported by the adaptor and see what happens if that was the case.... Smoke makes things work. When the smoke gets out, it stops! |
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| palcal Guru Joined: 12/10/2011 Location: AustraliaPosts: 1967 |
I could not go lower but went to 1280X1024 and it worked OK. Paul. "It is better to be ignorant and ask a stupid question than to be plain Stupid and not ask at all" |
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TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 6223 |
I assume you mean 0.6V on the UBW32? It has a diode clamping the level which should be around 0.6V not 0.06V That should not be enough to be a problem. The colours will be a little bit duller, but OK. It will be the sync pulses that are important. I have had fussy converters before but nothing to test with now. Jim VK7JH MMedit |
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| palcal Guru Joined: 12/10/2011 Location: AustraliaPosts: 1967 |
No the three voltages are .05V, .073V, and .08V. I would have expected the .6V as you say. Maybe someone else could measure. Paul. "It is better to be ignorant and ask a stupid question than to be plain Stupid and not ask at all" |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9501 |
Well, I will have to eat some humble pie here - both the VGA converters I tested work fine to colour composite video, despite the non-standard resolution of the CMM. Sorry, palcal - looks like you were right all along - it SHOULD work. 
Text is pretty fuzzy though, and hard to read, but that is not exactly unheard of with these converters. The ones I tested were Grand Hand View - beige case with all connections via flying leads, and the DSE XH8624 PC-to-TV Converter - grey box with two buttons on top. You can't by the 8624 from DSE anymore. I do have a couple of unopened DSE XH8624's in stock(still in their boxes), if you would like one - PM me if interested. At least these have been tested and do work. Smoke makes things work. When the smoke gets out, it stops! |
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| palcal Guru Joined: 12/10/2011 Location: AustraliaPosts: 1967 |
What did you test it with, did you use the UBW32. What price on the converter. Paul. "It is better to be ignorant and ask a stupid question than to be plain Stupid and not ask at all" |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9501 |
I have four UB32's, but I don't have any that are setup for CMM - Yet. I used the Altronics CMM kit. Do you happen to have either the Altronics kit or one of CG's CMM boards you could try by any chance? No cost for converter, but I would ask that you pay for postage - I will find out what that is. If you still can't make your $12 one work, I would love to do a swap - you send it to me so I can play around with it. Smoke makes things work. When the smoke gets out, it stops! |
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| TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 6223 |
My UBW32 certainly does have +0.6V on the VGA pins. Because the output is mainly black, you need to use a CRO to see the 'on' levels. You could also paint a white box on the screen and then a multimeter would be useable. Jim VK7JH MMedit |
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| palcal Guru Joined: 12/10/2011 Location: AustraliaPosts: 1967 |
OK I tested the voltages again with a CRO and different colour screens and all is working OK. So I'm back to Grogsters original answer of screen resolution. Still waiting for Frank to chime in again as he has a UBW32 working with a composite converter. I don't have any other CMM only the UBW32. Paul. "It is better to be ignorant and ask a stupid question than to be plain Stupid and not ask at all" |
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| Frank N. Furter Guru Joined: 28/05/2012 Location: GermanyPosts: 939 |
Hi Paul, please excuse me for my late response. My adaptor looks like yours in your link and works without any problems. Did your your Maximite realy work in VGA mode??? Did you have a picture with a connected VGA monitor? Frank |
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