Questions tagged [vga]

stands for Video Graphics Array and provides a 640x820 screen resolution.

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X-Y-Z video signal to VGA converter using FPGA [closed]

I want to convert X-Y-Z video signal output of a device to VGA format to be displayed on a PC LCD monitor. I need an idea how to this. Maybe Something like Mega_Creamery's Altera Cyclone FPGA project ...
3 votes
2 answers
177 views

Why do VGA VSYNC and HSYNC need 47 ohm resistors in this schematic?

In Chapter 3 in this document there is a schematic showing a connection to VGA. Why is there a 47 ohm resistor connected to VSYNC (GPIO17) and HSYNC (GPIO16)? I managed to understand the other ...
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Does VGA (video graphics array) carry an analog-modulated digital video signal?

If VGA (video graphics array) is analog, then how is it compatible with a digital monitor? When I say "digital monitor", I am referring to TFT LCD display monitor. My guess is that maybe it ...
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Decoding VGA Signals on a microcontroller design concerns

I have a microblometer sensor that outputs a VGA signal with resolution 640 * 480 pixels. Lets say I want 30 FPS.. I would like to know what would be the easiest way to convert that video signal into ...
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Package & Variable Gain Amplifier Identification

I am trying to identify an unknown wideband VGA whose markings were scratched off. It is apparently a 5W amplifier, drawing 1A @ 5V power supply, with analog gain control - using a 10k potentiometer. ...
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VGA DDC voltage

While designing a pcb with a VGA output, I came across the DDC pins on the connector. I'd like to use that protocol to retrieve data from the monitor. After searching on the internet, I found that the ...
1 vote
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VGA video switching using TS5v522

I am trying to bring video card signal to switch to a single monitor. I was hoping to use the TS5v522c but am not having much success. Data sheet below. https://www.ti.com/lit/ds/symlink/ts5v522c.pdf#...
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1 answer
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Wiring VGA card to act as PCIe host?

Is it possible to wire a graphics card to act as a PCIe host controller? I mean, assuming the firmware is also rewritten, is there anything in terms of hardware (EE) that prevents me from using a GPU ...
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Help with VGA KVM switch

Hi for my work im triying to implement a VGA KVM switch to replace a manual switch that the production line workers use to switch between Quality control test, to replace that i tought about using a ...
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1 answer
116 views

FPGAcontrolling VGA: why does the monitor show a right triangle and not an isosceles one?

I'm trying to draw on a monitor by using an FPGA (SPARTAN 3A) and by considering a monitor with 640x480@60 Hz of resolution. In my code, I would like to start from a certain pixel (320,190) and to ...
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Why might you use 2 switch ICs for a 2-in-1-out VGA switch schematic?

For a hobby project, I'm planning to build a 4-in-2-out VGA (yes, VGA) KVM switch/matrix circuit. The top result on Google at the time of researching is 'Building a KVM – Part 1'. I'm trying to figure ...
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Making a graphics card using transistors

Is it possible to make a graphics card using no ICs that uses a VGA cable and outputs, say, 16px by 16px? Or are too many transistors required for it to be realistic? (Too many meaning more than 500.)
3 votes
3 answers
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How to determine if a video signal is interlaced

I know what the difference between interlaced and progressive scan is: in progressive video modes, the monitor displays all the lines of a video field sequentially. In interlaced, it displays them on ...
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1 vote
2 answers
173 views

Mystery Monochrome Monitor

I rescued an old monochrome monitor from the e-waste, but the cord had already been cut. So now I’m trying to see if I can get it working. I know… This is of an era that rather than have a connectors ...
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Using ARM or any microcontroller text output [closed]

As you may notice, some microcontrollers have an output in textmode with four pin assigned to send serial data. In some cases we may need to use this output for finding our problem,without forcing to ...
1 vote
2 answers
131 views

VGA 15P D-Sub --> 2 row motherboard socket

I have a SuperMicro X9DRW-iF motherboard, whose female VGA video connector literally broke off the motherboard whilst I was pushing the video cable into the connector. OK, no worries -- I thought, I ...
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2 answers
92 views

PAL Video - Horizontal Color Pixels

I've created an 8-bit VGA controller that outputs a 400x300 RGB signal. I also want to implement an AV output using PAL encoding. I don't understand how I can achieve the same resolution since the ...
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1 answer
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Aggregate value error in system verilog

I am working on a project and have encountered a problem with one of my modules. I am trying to add offsets to 11 bits input from another model and output them to vga controller. My inputs are ...
1 vote
1 answer
74 views

Need help to identify smd component of VGA adapter MSI GTX1070

I did clean my VGA adapter MSI Geforce gtx 1070 with compressed air and one smd component has gone, now the adapter did not work. On another adapter I found out the marking on the component body and ...
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1 answer
65 views

Is there a way to utilize a old screen using electronics that can be handheld?

So, I guess this is a follow-up question to my previous one: Is there a way to output high quality pictures to a monitor with VGA using an Arduino?. Obviously, the answer did help me to get rid of the ...
0 votes
2 answers
290 views

Displaying a video on VGA using FPGA

I have succeeded in displaying an image on a VGA monitor using FPGA, by generating a ROM loaded with a coe file. But knowing that a video is a succession of images, how can I do that? Any ideas please?...
2 votes
2 answers
205 views

Is there a way to output high quality pictures to a monitor with VGA using an Arduino?

So, I had a spare monitor lying around and I wanted to find a way to make it like a picture slideshow. I also have an Arduino Uno. I was wondering whether there is a way to take some pictures from an ...
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1 answer
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A simple VGA controller in VHDL not working properly [duplicate]

I'm trying to make a VGA controller to display an image on FPGA in VHDL, so I searched and found a code in the book of Volnei A.Pedroni- Circuit Design and Simulation with VHDL in page 432 that I ...
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1 answer
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Looking for ideas: An easy way to automatically press a key at computer restart

I'm looking to make a restart solution for a computer that doesn't necessitate manual input. I have a server with a BIOS that, when every slot of memory is full, automatically downgrades the speed of ...
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Routing Guidelines for Analog Video (VGA, RGsB, PAL)

I am currently into the design of the analog video IN/OUT. Basically I have a 3U PCB on which the encoder/decoder ICs are present, that converts the digital video to the analog RGsB (RGsB OUT) and PAL ...
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VGA DAC circuit

I have a PIC mcu which I am trying to drive a VGA monitor with.I am using a simple resistor DAC. I was trying to show a simple white screen but it only shows some shade of grey/black. I measured the ...
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1 answer
769 views

Intel De1-SoC VGA controller in VHDL

I have implemented a VGA controller in VHDL using the timing specifications for a 600x480 monitor as described in the attached photos. The module takes in a 50MHz clock and is supposed to draw a ...
4 votes
1 answer
701 views

Convert from VGA 9 pin to RCA (manually - old machine) [closed]

I'm in a trouble. Can someone help me? I have a very big machine where I had mounted an IBM 5151 monitor by VGA. The VGA cable was connected to the card below (see attachment), by 4 wires. Now the ...
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2 answers
2k views

What does it mean "positive" or "negative" polarity in VGA's HSynch and Vsynch?

I have been trying to study how VGA signals work and I stumbled upon this this page with all the different VGA timings. What isn't clear to me is what it means by "polarity horizontal sync pulse ...
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2 answers
418 views

8 bit PC integrated with VGA video card (similar to ben eater project)

I'm thinking about making a project like this one and add a graphics card like that one. Using an EEPROM for the video memory and changing its content setting it in write mode and assigning a value ...
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VGA digitizer with FPGA (input, not output)

Producing a VGA signal with an FPGA has been done by so many people it is a common starter project. What I cannot find is information on how to decode a VGA signal with a FPGA for example to capture a ...
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I accidentally bought an HDMI (male) to VGA (male) cable that isn't an adapter or converter of any sort. Does this product have any value? [closed]

I have a laptop with an HDMI port. I have a monitor with a VGA port. I wanted to connect the two. The website I bought this cable from labeled it as an 'adapter' so I assumed it would do the ...
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1 answer
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15 pin VGA configuration

I want to connect a 15 pin vga output from a computer to a TV input. However I do not want any data from the TV sent back to the computer. What I mean is that I do NOT want the TV to be a smart ...
1 vote
1 answer
444 views

Are the Front- and Back-Porches Required to be Black for VGA?

My first question for this project was how to process a fast analog signal in the first place: Digitally-Controlled Analog Processing for VGA Video Signal? This one is about a specific detail of that ...
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Do usb and vga controllers consume power if there are not devices connected to them?

Let's consider the following situation. There is a server, for example supermicro, that has 4 USB2 ports, 4 USB3 ports, and 2 VGA ports. At the same time we don't use these ports, I mean there are no ...
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Why do LED/OLED HD and UHD displays have "global refresh rates"?

What is the benefit to scanning vs. individually addressing and updating lines or pixels or screen areas? Is there a standard interface to the majority of HD or UHD displays that allows the ...
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1 answer
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VGA to Composite conversion cable

I'm not able to obtain an adapter from local markets for vga to composite video output. Found a circuit [VGA to composite circuit. Does it work?] that claims to work. I didn't had a vga cable so I ...
2 votes
1 answer
202 views

Digitally-Controlled Analog Processing for VGA Video Signal?

A few months ago, I replaced the dead fluorescent backlight of an LCD computer monitor with an 8-bit-per-channel RGB LED strip, and built a controller for it from an AVR microcontroller that talks to ...
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Present two images side by side on the VGA screen from FPGA

Im trying to get a clue how to present two images on the screen using VGA. I using Altera Cyclone 2 DE2 and VGA, I have already working vga sync driver for 640*480 res: ...
1 vote
1 answer
531 views

How to implement VGA Controller for Changing Background Color in VHDL

I'm a beginner VHDL coder. For just fun, I'm trying to implement the 640x480 @60Hz VGA controller with Basys 2 Spartan-3E FPGA Trainer Board. My goal is to make ...
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5 answers
1k views

How can I make a mod for VGA cable to display only grayscale or Black & White?

My computer connects to the monitor using a VGA cable. I want to turn the display grayscale or black & white. I don't want to use any software solutions as I fear it will not be as effective as I ...
10 votes
2 answers
768 views

Ghosting in VGA signal generation

So, I'm generating a 1280x1024 (native screen resolution) VGA signal using a Lattice HX8K > Yosys, according to these timings, and a PLL of 107.812Mhz of Pixel Frequency. I then pass it through a ...
4 votes
2 answers
2k views

Is this how a R-2R DAC for VGA should work?

I'm trying to wrap my head around if this is how a R-2R DAC should work. I say should for two reasons: (1) because I think I understand the theory behind the resistor ladder of subsequent voltage-...
2 votes
0 answers
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Schematic for TTGO VGA32 V1.2 by Lilygo

After recieving a couple of these boards to tinker with I have been searching online for some schematic. I have only found the following useful images: Block Diagrams with several pinouts described ...
3 votes
2 answers
2k views

How I can resolve the problem of conversion (to_integer(unsigned(variable))

I want to solve a problem in VHDL with Quartus II. I made a model of VGA protocol 640/480. When I made the part of displaying I made one two signal in integer. Error (10621): VHDL Use Clause ...
2 votes
1 answer
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8-bit VGA DAC Design Question

I am being driven up the wall with designing an 8-bit VGA DAC for an embedded application. Everywhere I've researched highlights the necessity for "impedance matching" the 75 ohm termination ...
2 votes
1 answer
294 views

Video RAM: How to create a shared bus for processor and VGA controller

I have a discrete video controller which reads a image from SRAM. The image should be written by a CPU. So I designed this circuit. I use two display RAM because I want to use double buffering. So ...
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Can an incorrect VGA timing kill a modern LCD screen?

I'm going to play with an Artix-7 dev board with a VGA port (Nexys 4 DDR from Digilent) and I'm a beginner at this. Assuming the pinout is correct, is it possible to destroy a (very) cheap modern LCD ...
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Looking for a display RAM for my VGA card [closed]

I´m designing a simple 800x600 pixel VGA card, based on this example (but I don´t reduce the image size). I also want to use a display RAM, so a microprocessor can write a new image. For this I need ...
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Trick monitor into receiving signal [duplicate]

I have the plan to convert a few old LED backlit monitors into false windows. While I theoretically could buy direct LED drivers to power these panels, I'd prefer to keep the existing circuitry, since ...