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Forum Index : Microcontroller and PC projects : DUMB DISPLAY
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PeterB Guru Joined: 05/02/2015 Location: AustraliaPosts: 639 |
G'Day All. There are many displays available that come in a range of sizes and are usually in some sort of protective housing. Things like truck rear vision systems up to monster TVs. The thing they have in common is an A/V input. So, is it possible to put something between an E64 and one of these devices to make a dumb display? The SSD1963 chip is available so that gets the data neatly arranged in a buffer but then what? Is there a device to solve that? Or, could it be done with this Ccode stuff? Peter |
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retepsnikrep Senior Member Joined: 31/12/2007 Location: United KingdomPosts: 131 |
Tellymate.. Serial to video chip/code. Very useful http://www.batsocks.co.uk/products/Other/TellyMate.htm Gen1 Honda Insights. |
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PeterB Guru Joined: 05/02/2015 Location: AustraliaPosts: 639 |
G'Day retep I particularly want to interface with mite because of MMBASIC with its abilities. A VGA to composite converter is on my list of things to look into but I have to remember all these video standards etc. I am surprised that such a thing does not exist given the popularity of the mites. Thanks for your interest. Peter |
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bigmik Guru Joined: 20/06/2011 Location: AustraliaPosts: 2870 |
GDay Peter, VGA to composite do exist, I do not know how well they work let alone what a MMBasic format will look like. At least they are cheap enough. Aliexpress link Kind Regards, Mick Mick's uMite Stuff can be found >>> HERE (Kindly hosted by Dontronics) <<< |
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Boppa Guru Joined: 08/11/2016 Location: AustraliaPosts: 814 |
I have two of these connected to my and my sisters security camera systems, to allow the output to run through the lounge TV's at our houses They work quite well, there is a slight quality reduction compared to the vga out directly, but I don't know how much of that is due to the converter, and how much is just that the composite video output isn't as good as a SVGA output in the first place (We did it because the TV in my case only has composite video inputs, and in my sisters case, there was a 25m run from the security system to the TV, which wasn't doable with a vga cable- plus the composite video cable was a lot easier to pass through the several walls and a floor than the bulkier VGA plug...) |
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PeterB Guru Joined: 05/02/2015 Location: AustraliaPosts: 639 |
G'Day both If I get the data into an SSD1963 I should be able to clock it out, add some sync and DAC, into a AVG to composite converter and Bob's your uncle. The problem is, will I live that long? But I will continue to think about it. HDMI is digital and I know nothing about the format but it would be tempting. This may just one of those projects where, when they are chucking the dirt in, I will still be thinking "what if I.................." Why has it not been done? Peter |
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TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 5905 |
It would be simpler to use a colour maximite as the display driver. UBW32 style or circiutgizmo's board are both reasonable sizes. You would still need a RGB to composite adapter or stick with monochrome. You can still put a E64 as the brains if needed. Jim Edited 2019-09-13 18:11 by TassyJim VK7JH MMedit  MMBasic Help |
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panky Guru Joined: 02/10/2012 Location: AustraliaPosts: 1094 |
Even simpler would be one of Peter M's MM Extremes - either the 100 or 144 pin jobs that have vga out. Add an external vga to composite adapter off ebay for under $10 to finish the job. This would give you access to all the MM+ fancy gui graphics. Or again, a Picromite with HDMI out may be an option. IMHO, trying to do something with the ssd1963 would be extremely problematic. As I understand it, driving an LCD display is quite different to normal "tv" style composite video. Panky ... almost all of the Maximites, the MicromMites, the MM Extremes, the ArmMites, the PicoMite and loving it! |
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lizby Guru Joined: 17/05/2016 Location: United StatesPosts: 3015 |
Indeed--if that's what you're looking for, why not Pi-cromite on a pi zero w with one of these HDMI to composite modules Around $20 US all-in including shipping. PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed |
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PeterB Guru Joined: 05/02/2015 Location: AustraliaPosts: 639 |
Good morning / evening All Thanks a lot. Information flooding in and now I have some reading to do. There are things there that I have never thought about. Another steep learning curve, will they never end? Peter |
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BrianP Senior Member Joined: 30/03/2017 Location: AustraliaPosts: 292 |
The grey cells need constant exercise B... |
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PeterB Guru Joined: 05/02/2015 Location: AustraliaPosts: 639 |
Good morning B According to the ABS (I think) I've got just over 8 years left. At my present rate of learning, the "out" is much greater than the "in" but who cares? The other thing is, when you exercise something, are bits supposed to break off? Peter |
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TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 5905 |
Electronics Australia March 81 had an on screen audio frequency graphic analyser If I can find the circuit for it , there might be something that we can adapt. Jim VK7JH MMedit  MMBasic Help |
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TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 5905 |
I surprised myself. My shed must be better organised than I thought. I found the circuit diagram for the graphic analyser. It uses the TEA1002 IC to convert from RGB to composite. It would be ideal to hang of the back of a MMX or CMM to get the composite signal without too many other parts. Her is a link to a signal generator that uses the same chip http://messui.polygonal-moogle.com/comp/tea1002.pdf Jim VK7JH MMedit  MMBasic Help |
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BrianP Senior Member Joined: 30/03/2017 Location: AustraliaPosts: 292 |
I'm reminded of the advice drummed into us at an early age that we should keep an open mind - but then I find things fall out... B |
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Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9063 |
There is the ASCII Terminal that Geoff made for doing that kind of thing. Can output single-colour VGA or composite video, and accepts standard serial from any MM or other controller such as PICAXE. A word of warning on the VGA-to-composite adaptors: Some of them DON'T like the taste of the resolution that the MM or CMM produces, and will simply refuse to convert it. You may have to try a few different ones to get one that works. Smoke makes things work. When the smoke gets out, it stops! |
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PeterB Guru Joined: 05/02/2015 Location: AustraliaPosts: 639 |
G'Day Grogster I have ordered a VGA to Comp. converter and I have a Colour MaxiMite. Nancye has a 7 in truck rear view display on her gopher so I'm well in. There is so much stuff that is almost suitable that I'm starting to regret starting. But some time ago you did have a need for back to back dumb displays so is this of interest to you? Peter |
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robert.rozee Guru Joined: 31/12/2012 Location: New ZealandPosts: 2289 |
as i recall, with a composite video signal the vertical resolution is limited to something like 576 lines for 50Hz PAL, or 480 lines for 60Hz NTSC. the horizontal resolution is more tricky to nail down, as luminance and chrominance components of the signal are encoded quite differently: 160–200 colour dots if you want the nicest possible image, 320–400 colour dots if you don't mind some artefacts, and if your signal is monochrome then something like 640 or even 720 dots on a good day. for a small 5" screen displaying a PICTURE (ie, from a reversing camera), the above is just fine - the colour resolution of the human eye isn't that great anyway and you don't notice anything wrong. but once your screen size gets bigger and the relevance of fine detail increases (ie, displaying computer graphics or text) then the shortfalls become visible to the user. i can see VGA support on screens becoming more and more uncommon over the next few years, with the vast majority of monitors only supporting HDMI and composite. after that, composite will start to fade away. which leaves the question: what will we plug our maximites into? will the only games in town become a micromite hooked up to a terminal or a RPi running mmbasic? cheers, rob :-) |
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ceptimus Senior Member Joined: 05/07/2019 Location: United KingdomPosts: 130 |
There are lots of VGA to HDMI converters around for about five pounds or dollars. The better ones also allow you to connect an optional audio input as well as the VGA cable, so you can use a HDMI monitor or TV with built-in speakers without having to worry about connecting a separate audio input. They're just a small (matchbox-size) adapter - they use a 5V supply (and often come with a mains adapter), but if your monitor/TV also has a spare USB connector, you can usually get the 5V to power the adapter from there, so you don't need a separate lead to yet another mains adapter. You can find them on Amazon, Ebay, ... Just search for VGA to HDMI. . Edited 2019-09-16 00:46 by ceptimus |
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PeterB Guru Joined: 05/02/2015 Location: AustraliaPosts: 639 |
I think ceptimus is correct. The maximite, being VGA, will go on for ever more or less. Things like the E64 are limited by their output so will one of you "young" blokes please design a device that plugs into the E64 and outputs HDMI & VGA. It shouldn't be too hard said he, tongue firmly in cheek. Peter |
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