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Questions tagged [vga]

VGA stands for Video Graphics Array and originally provided a 640 × 480 maximum screen resolution.

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OV7670 QQVGA RGB565 config

Does anybody has register configuration for OV7670 QQVGA RGB565? I found this but I'm not sure that it gives QQVGA resoltuion. ...
macola995's user avatar
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0 answers
90 views

DE10-Lite VGA Controller Display

this is my design: https://github.com/Shehab-Hesham/FPGA_IP_VGA/tree/main. On an oscilloscope, the vertical sync and horizontal sync are correctly given as output; however, the color channels output 0 ...
Shehab's user avatar
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5 answers
782 views

VGA cable wire pinout

I stripped this VGA cable. It only has 5 wires. One is just single copper strand. Is this normal? If so what would be the pinout?
Kalash Changal's user avatar
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1 answer
160 views

Monitor ID Pins on VGA Connector

I'm working on a hardware project where I want my board to act as a VGA monitor, so it has a female VGA connector on it. Everything I can find online says that pins 11, 12, 4, 15, are used to identify ...
tryna_learn's user avatar
6 votes
1 answer
222 views

Pi Pico generating YPbPr-like signal for VGA monitor

I would like to generate TED-like signal for VGA monitor input (Analog RGB + H/V-Sync). This is basically 16 pre-defined chroma values with 8 brightness levels applied, encoded as 7 bits: ...
smokku's user avatar
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1 answer
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Convert 4bit VGA to 1bit VGA

I have Nexys A7 FPGA and I would like to play this game on it Here is my: https://github.com/juanmard/screen-pong Now the first problem I encoutered is that my FPGA requires 4 VGA RED and 4 green and ...
LaCalienta's user avatar
-1 votes
1 answer
104 views

Glitchy display screen

I am trying to display a picture on my monitor using FPGA board. When I send my signal, everything is alright and the monitor receives signal but the picture area is glitchy with white stripes and ...
Rezef's user avatar
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2 votes
0 answers
290 views

How to convert VGA to RGB?

I have an LCD screen whose connector does not have a synchronous pin (according to the photo). I want to connect a laptop to it through the VGA port. Can you help me?
Kiani's user avatar
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Pros and cons connecting R2R directly to FPGA/CPLD

I am designing the R2R-based DAC circuit (5 bits per channel) for the video output @ 25.17 MHz. Looking for advice to ensure I didn't overlook something very important. Initial design was CPLD -> ...
Anonymous's user avatar
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8 votes
3 answers
3k views

Is HSYNC required during VSYNC for VGA?

As a development to my previous question I am developing a protocol to drive VGA through lines originally designed for SPI communication. The problem is that I may be able to instruct the receiving ...
Anonymous's user avatar
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3 answers
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How to determine the horizontal pixel count out of a HSync and VSync signal

I have a project where I want to read the HSync and VSync signal from a VGA cable into an microcontroller and calculate the pixel clock. Calculation: Pixel clock = Horizontal Pixel Count * Vertical ...
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6 votes
3 answers
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Does VGA DB15 have the same pinout as VGA DE15?

I am building a small device with VGA for the display. Sadly the diagrams I am using are for a 15 pin, 2 row connector, and I would like to use a 15 pin, 3 row connector for compatibility. Do they ...
R Baker's user avatar
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2 votes
1 answer
193 views

Nexys 7 FPGA Verilog VGA signal recognized but nothing displayed

I am trying to generate images on a Samsung S22C300H monitor using the Diligent Nexys 7 board running the Xilinx Artix 7 FPGA. Even though the datasheet says the display supports 640x480, I was only ...
Luminous_'s user avatar
4 votes
2 answers
1k 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 ...
user's user avatar
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3 answers
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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 ...
Noob_Guy's user avatar
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2 answers
729 views

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 ...
Andre Ahmed's user avatar
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0 answers
87 views

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. ...
George's user avatar
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2 answers
499 views

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 ...
Clément Chaine's user avatar
2 votes
0 answers
69 views

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#...
michael moore's user avatar
0 votes
1 answer
144 views

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 ...
MishaP's user avatar
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0 answers
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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 ...
RICARDO GARCIA's user avatar
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1 answer
171 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 ...
sun's user avatar
  • 13
2 votes
1 answer
395 views

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 ...
Nick Bolton's user avatar
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4 answers
379 views

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.)
user118995's user avatar
3 votes
3 answers
2k views

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 ...
pjc50's user avatar
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1 vote
2 answers
688 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 ...
Wes Modes's user avatar
  • 119
-1 votes
2 answers
114 views

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 ...
Raaynix's user avatar
1 vote
2 answers
502 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 ...
NoRainDropsInTheSky's user avatar
0 votes
2 answers
232 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 ...
tcop's user avatar
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1 vote
1 answer
2k views

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 ...
Lior Fridman's user avatar
1 vote
1 answer
153 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 ...
Denis Svetlakov's user avatar
0 votes
1 answer
107 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 ...
Gaurav Mall's user avatar
0 votes
2 answers
699 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?...
tbs1996's user avatar
2 votes
2 answers
498 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 ...
Gaurav Mall's user avatar
0 votes
1 answer
414 views

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 ...
tbs1996's user avatar
1 vote
1 answer
159 views

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 ...
Dewey's user avatar
  • 133
0 votes
0 answers
533 views

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 ...
Karthik's user avatar
0 votes
0 answers
405 views

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 ...
Andrea Bianchi's user avatar
0 votes
1 answer
2k 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 ...
Sweet Nemesis's user avatar
4 votes
1 answer
1k 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 ...
Marc Aurel's user avatar
0 votes
2 answers
6k 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 ...
Andrea Bianchi's user avatar
1 vote
2 answers
592 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 ...
Paa's user avatar
  • 135
0 votes
1 answer
574 views

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 ...
Adam Eberbach's user avatar
0 votes
2 answers
203 views

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 ...
Dequavis's user avatar
0 votes
1 answer
118 views

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 ...
user13111321's user avatar
2 votes
1 answer
906 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 ...
AaronD's user avatar
  • 5,676
0 votes
4 answers
84 views

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 ...
ThatsMe's user avatar
  • 151
0 votes
2 answers
192 views

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 ...
Dagelf's user avatar
  • 101
3 votes
1 answer
6k views

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 ...
Pawan Shrestha's user avatar
3 votes
1 answer
369 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 ...
AaronD's user avatar
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