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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
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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.
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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.
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These are all irrelevant to what i asked, anyways thanks.
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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
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I have a lots of girlfriends.No need of this humble advice. Anyways i am also a girl.
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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 
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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?
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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
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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.
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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!
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it is an cmplicated one but i think so far ..it has some sollution..such as...plc device..the plc device has two logic gates...1 and 0....now you have to think that how my call ..or mabile call will give an instruction of 1 and 0...so i think that transducer which can be installed at the end can solove this problem....pc is used ....
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I am building a replacement home/office server for a small software company. The server functions as a print server/web server (internet and intranet)/file server/sql server. Currently, the OS (2003) and other files are only using about 38 GB. I have a 64 GB Patriot SSD that I had planned on putting everything on. (Server 2008 r2, SQL Server 2008, etc.) I also have a Seagate Barracuda 1TB 7200 drive that I was going to use for system backups and sql log files. Other hardware in the new build are a AMD Phenom II X4 955 (3.2 GHz) and 8 GB DDR3 RAM. Most of the SQL databases are used for web reporting applications for yearly data, and so are mostly read heavy. (at least 90%) I have searched for information on best practices for using SSDs in production servers, but can't find enough information to make a decision on where to best implement the SSD in this scenario...as the main drive with the OS and applications, or as a secondary drive for only certain things like sql data files, web resources, etc. I am open to any suggestions. Thank You
"Go forth into the source" - Neal Morse
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Today's Insider (the CodeProject daily newsletter) had a link to this blog[^] that may interest you.
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.
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Thanks, I did see that article, which left me more confused than before. I went ahead with my initial plan and put the OS and apps on the SSD. Aftert installing SQL Server 2008 and Crystal Reports XI, I still have over 36 GB left over. SQL Server log files (including tempdb) are located on the secondary drive, as are all development files, database backups, system restore image, documents, etc. All in all, this was a very boring build...I spent more time planning it than it took to put together. Everything worked the very first time. It seems to be a very speedy system, from POST to desktop in less than 10 seconds. (not counting typing the login)
"Go forth into the source" - Neal Morse
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Yes, I usually hear good things like that about SSD; the article I mentioned was the first negative I saw. You should report back in 12 months or so...
Good luck.
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.
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What is the goal of using a SSD?
Is there something specifically that you want to fix? Or you just want to use one?
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It was more a lust for speed combined with the price decreases. I also believed that the SSD would be more energy efficient and reliable. Needless to say, I was a bit conerned reading the aformentioned article about failure rates...with my shiny new SSD still in the box. It wasn't a fix for anything...I really have no complaints whatsoever with the current server. (single core 2.8 Intel, 3.7 GB DDR, SATA II master/slave, running Server 2003) If I didn't have to keep up with what the customers are using, I'd stick with it forever. This box has run 24/7 for over 5 years, aside from an occasional power outage or upgrade. I just hope I can get the same from my new setup.
"Go forth into the source" - Neal Morse
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After 5 years I'd want to replace anything that's intended as a high availability system even it's not overloaded yet. MTBF's start adding up as your parts get older.
3x12=36
2x12=24
1x12=12
0x12=18
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Doesn't matter then.
A server shouldn't be rebooting much and small performance improvements there don't matter.
And you don't seem to be concerned about application speed either.
As an administrator I would put the OS on it. And anything else that was implicitly recoverable such as applications.
That speeds reboots and updates (administrator time) without endangering business data.
Once you have more personal data on SSD and once SSDs have in fact actually been around long enough to be more realistically evaluated then you might use it elsewhere.
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I have investigated in the past the SSD technology and there is not an easy decision. You should select very carefully the SSD part to check wear-leveling algorithms, error correction strength etc.
Also it depends from your OS. The numbers that the manufacturers present as a reliability are not representative (ie. 20GB/day for 10 years). According to these numbers there would be no question. However nobody states that the least erasable sector is 128K (or more) so if you need to update one byte in the file you will need to erase 128K bytes (or consume a new sector). Of course this could be refined and minimize this to 4K sectors. Nevertheless although you might write 1byte, you consume 4K and thus the numbers changes.
I would propose that if you have linux you can place your OS there in read-only mode (place temp and swap partitions to a standard HDD). Also you can save there your data. However keep in mind that the data retention on SSD is 10years (you can just write a cron script to copy the files once per 2 or 5 years  ). If the application that handles the data does not do many write access (either append or change) you are pretty safe.
In case of windows i would recommend to place the OS on a HDD. The application could be to a SSD (assuming that these do not do heavy write activities inside their directory). You can use the sysinternals diskmon tool to gather actual read-write events to your HDD. Then you can make a histogram on Excel and see how many writes your system have. I believe you can select which disk to check.
Regards
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Really the only good use of a SSD over a conventional rotating disk is in an application where the computer may be exposed to vibration. An SSD is not affected at all by vibration whereas a rotating disk can be brought to its knees. Some of the read/write speeds are really not very noticeably different, manufacturers exaggerate their specs beyond belief. Usually the rates they quote are only burst speeds that the drives can't sustain.
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Hello all,
I'm facing a problem with a LASERJET HP printer:
When I try to print there from any computer in the network the printer prints with some errors... it is like in some places a shadow of what has been printed is appearing.
I've tried to clean the printer from the printer control panel (standing in front of the printer and pressing keys there).
Nothing has changed.
HP recommends me to use HP printer TOOLBOX, but I can't get it from the CDROM neither from the download section of the HP web page...
Do you know if I should make a triple combo un the minesweeper software prior to try to find this software?
Any pointer will be appreciated!
Thank you in advance.
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