|
Hi!
I am trying to figure out how the video card talks to a projector. I am trying to code a small device that will be able to display images on the projector. I plan to expand this project, but before I even begin I need to know how I can talk to the projector.
I tried Google, Bing, and CodeProject but couldn't find the answer. I don't necessarily need the code, just a guide, or a paper explaining what happens behind the scenes and what data is exactly sent by the video card.
Thanks!
"The good news about computers is that they do what you tell them to do. The bad news is that they do what you tell them to do." - Ted Nelson "Why is it drug addicts and computer afficionados are both called users?" - Clifford Stoll
|
|
|
|
|
A video card sends exactly the same signals to a projector as it does to a monitor. It could be VGA/SVGA/XGA/**GA or HDMI or component RGB or just about any other video standard (even composite video  ). A projector, after all, is just a monitor built funny.
Cheers,
Peter
Software rusts. Simon Stephenson, ca 1994.
|
|
|
|
|
OK, here we go:
Preliminar information:
- No UPS sistem mounted.
- Several power cuts.
- Computer that was ON. (yes I know, I know...)
When I try to start up the computer:
The computer can't go further the bios message telling me that I should press F1 to continue as the BIOS has detected some changes (not specified).
If I press F1 nothing happens.
What would you do to recover that computer?
Thank you in advance!
|
|
|
|
|
Richard, this looks as an interesting answer. I'll check it when I'll be in front of the computer again.
Thank you for answering!
|
|
|
|
|
You were right... after a while it has shown a message telling that the battery had died... after using the bios to set a proper date and time the OS has started again...
|
|
|
|
|
Try a different keyboard?
If it's getting that far it appears to've POSTed correctly.
3x12=36
2x12=24
1x12=12
0x12=18
|
|
|
|
|
ermmm... it is not the same computer I'm using to write those messages... 
Nevertheless I've found what happened... the battery died, the date of the system was resetted and therefore the OS did not started. 
|
|
|
|
|
Joan Murt wrote: ermmm... it is not the same computer I'm using to write thos<layer>e messages...
I never said it was. This:
Joan Murt wrote: The computer can't go further the bios message telling me that I should press F1 to continue as the BIOS has detected some changes (not specified).
If I press F1 nothing happens.
Only occurs after the POST is completed.
Joan Murt wrote: Nevertheless I've found what happened... the battery died, the date of the system was resetted and therefore the OS did not started.
I've never heard of a system not letting you into the BIOS or an OS boot failing because the battery was dead before. 
3x12=36
2x12=24
1x12=12
0x12=18
|
|
|
|
|
Dan Neely wrote: Only occurs after the POST is completed
My fault... misunderstood it...
Dan Neely wrote: I've never heard of a system not letting you into the BIOS or an OS boot failing
because the battery was dead before. 
Me neither... it is amazing: the user told me that nothing happened this morning... after sitting in front of the computer and pressing F1 to continue after a warning telling me that the battery was dead... the Windows loading bar appeared and after that the mouse cursor on a black background. the fact is that nothing else happened... I've restarted a couple of times the computer and the same happened each time... After that, I've entered the bios and set the correct time and date and then all was back to normal... 
Who knows why but it works...
|
|
|
|
|
Dan Neely wrote: I've never heard of a system not letting you into the BIOS or an OS boot failing because the battery was dead before.
Its a feature... 
|
|
|
|
|
Its not big, and didnt take long to develope, but its complicated enough. But not a single BSOD during the entire dev test process and its functionally 100% too. (Smug satisfied smile time  )
Thats what 15 years experience gives and what the client pays for. (Even bigger smug smile. )
Dr D Evans "The whole idea that carbon dioxide is the main cause of the recent global warming is based on a guess that was proved false by empirical evidence during the 1990s" financialpost
|
|
|
|
|
A friend of mine who bought a second-hand LG V1 Express Dual Laptop, has asked me to reinstall the OS because there was a boot problem. I tried installing Windows 98, Windows XP, Windows Vista and Windows Seven. Any OS can be installed, but there is no audio output. All attempts of automatic updating of drivers failed.
However, when I boot with an Ubuntu Live CD (even without installing), I can here the logging-on sound. Could anyone help me find the necessary drivers or fix the problem in some other way...?
|
|
|
|
|
Do you see the device within the device manager or no? If you see an item with a question mark, that's usually indicative that the system can't find the right driver, if its there, the problem may be something else (although it may also have picked the wrong driver).
There's programs that allow you to scan the system to identify the hardware installed (this is one I've used)...
http://download.cnet.com/Unknown-Device-Identifier/3000-2086_4-42618.html?tag=mncol;1[^]
Once you've identified the hardware, go to the manufacturer's website to find the appropriate driver.
|
|
|
|
|
first go to the device drive:
there is a icon there like a speaker
heres your gonna do:
1. if there is a yellow question mark then it indicates that there are no drivers for your sound output or your driver is not compatible with your laptop
try to install the driver. there are lots of site to get the driver of your laptop
here!
2. try downloading universal sound driver.
there are lots of it on google
Unless your built in speaker is broken
|
|
|
|
|
Hi,
I am computer science student and i want to control the room lights via sms sent from remote mobile through gsm modem AT commands send to PC and is further forwarded to microcontroller ATMEGA8 but i donot have any idea how to start with.Can any one give me some circuit diagram based on this microcontroller circuit for controlling room lights through commands sent from pc to microcontroller. I want to connect microcontroller with PC via RS232. For the time being i just want to control one light using one relay. I shall be really thankful if anyone can send me the circuit diagram.
Thanks for help in advance.
|
|
|
|
|
There are a number of articles on such subjects here at CodeProject.
Have a look at these[^] and these[^].
Luc Pattyn [Forum Guidelines] [My Articles] Nil Volentibus Arduum
Please use <PRE> tags for code snippets, they preserve indentation, improve readability, and make me actually look at the code.
|
|
|
|
|
These are all irrelevant to what i asked, anyways thanks.
|
|
|
|
|
Send the SMS to the girlfriend and get her to turn the lights off?
Dr D Evans "The whole idea that carbon dioxide is the main cause of the recent global warming is based on a guess that was proved false by empirical evidence during the 1990s" financialpost
|
|
|
|
|
I have a lots of girlfriends.No need of this humble advice. Anyways i am also a girl.
|
|
|
|
|
How about just sending message to your pc via cellphone then your pc will process it (programming) and send output through parallel port or com port.
that should do it.
we created it last year via VB 6 
|
|
|
|
|
Yes thats what i want to do this via parallel port and i have come to know that it can be done through relays without using microcontroller?? Is it possible?? Can you send me the circuit diagram for that? Here is the link also:
http://michael.hinespot.net/circuit.php
Can i use the circuit diagram described in above tutorial?
|
|
|
|
|
my fault as i recall i connect my cellphone(3310) to my PC (parallel port)[i think i dont use any PIC i just use the nokia cable CP tp PC] then when i text that cellphone the text will appear on Visual basic textbox then my output goes to my parallel port as well
first you need to know the pin config of parallel port(output and input)
WATCH TUTORIAL
im still finding the site where i get the schematics
but it is possible
|
|
|
|
|
|
There are many ways to accomplish this:
1. Using a PC and a phone (connected with serial cable).
2. Using a microcontroller and a phone or GSM module.
3. Using PC and microcontroller and phone.
Obviously the third option is redundant.
Now regarding the which way to go (option 1 or 2) this depends if:
1. You know how to program embedded systems (and you know the flow of programming ATmega) or you want to learn.
2. You are an experienced PC (Windows/Linux) programmer.
As i am building embedded systems for many years i can provide you some info for the first option.
1. You can directly connect the phone to ATmega using the UART (of AVR). The phones normally have TTL logic level output for their serial port (and this is why you might need a level translator to RS-232 levels if you connect the phone to PC Serial port). Unless your phone provides a USB only connection (and this depends from the phone manufacturer and model) you can connect the ATmega to the Phone through the TTL serial port. I believe most elder phones have serial TTL interface.
2. The microcontroller have to drive the Relay(s).In the following link you can find way to do it (btw you will need similiar circuits if you drive from the parallel port):
http://www.scienceprog.com/drive-relay-with-avr-microcontroller/[^]
3. You have to write the software on ATmega (obviously) to control the phone (i believe AT commands) get the messages and activate accordingly the relays. If it is of any help to you i have a relative article for a simple non-preemptive OS for AVR that you can use as platform to begin building your application.
AVRILOS: A simple OS for AVR microcontrollers[^]
Hope this helps.
|
|
|
|
|
nice article. I hope she found what shes looking for. There is so many in the web the problem is how you interact them to pc. You must know the data receiver of CP , its data sent as well as in PC.
Good Job Bro!
|
|
|
|
General 
News 
Suggestion 
Question 
Bug 
Answer 
Joke 
Praise 
Rant 
Admin 
Submit an article or tip
