Archive

Archive for the ‘Computer Hardware’ Category

OVM 7690 Software Application Notes

August 11th, 2011 No comments

 

Omni Vision OVM 7690 VGA Camera. Low Power and Small Footprint.

OVM7690 CameraCube camera module software application note

Categories: Computer Hardware Tags:

Infrared Counter and Security System using 8051 Microcontroller

April 7th, 2009 No comments

Infrared Counter and Security System using 8051 Microcontroller

Infrared interruption counter and security system is a reliable circuit that takes over the task of counting number of interruptions very accurately. When somebody enters into the room, then the Counter is Incremented by one. The total number of Persons inside the Room is displayed on alphanumeric LCD.

Whenever the user decides to turn off the counter the circuit acts as an infrared security system. The interruption counter can be used in places like car parking where cars enter through one gate and leave through another gate. The interruption counter can provide a quick access to view the number of cars entered at end of the day. It can also be used to record number of persons entering a room. The same circuit can be used as security system at night.


The microcontroller does the above job it receives the signals from the sensors, and this signals operated under the control of software which is stored in ROM.
All the above systems are controlled by the Microcontroller. In our project we are using the popular 8 bit microcontroller AT89C51.

8-bit microcontrollers are widely used mainly because they are simpler and easier to use than 16-bit or 32-bit microcontrollers, and also due to their low cost. Among them, Motorola 68HC11, Microchip PIC family, and the industry standard 8051 are prevalent. To interface these devices to the outside world, input and output devices, like Keypad and LCDs respectively, are generally used.



Even though many simulators are available for the 8051 family, most of them do not simulate all the embedded peripherals, and only a few can simulate external peripherals. So, programming and debugging was done using KEIL simulator while circuit simulation was done using National Instruments Multisim 10.0.

Download the complete code:

Complete Project Report With Code

Categories: Computer Hardware Tags:

How to create your own torrent file and send it to friends?

March 13th, 2009 No comments

Torrents are great, they are the best way to share large files with your friends, or even with people you don’t know at all. But surprisingly enough, not many people create torrents when they need to share something. I have “a lot of” friends who know how to download torrents, but when they need to send me their latest 200MB vacation picture collection, they ask me to “get on msn”.

It’s not that I have anything against msn (although the file transfer sucks), but why don’t just use BitTorrent? Especially if you want to send something to more than one person, or if you want to share high quality HDTV files, because then you can share the bandwidth.

So how do you do this? Well it’s very simple. Open your favorite BitTorrent client and do the magic trick:

 file > create torrent

That’s all? Well almost. All you need to do now is put in the tracker info and tick some boxes. This can differ somewhat from client to client but it all comes down to the same thing.
uTorrent

utorrent bit torrent

1. File > Create new Torrent (or CTRL + N)
2. Select the files and or directories

3. Trackers: This is probably the hard part for most people. But it’s pretty easy, just put in one of the popular public trackers. You can use one or more trackers, but in general one is enough.

Here are some good trackers you can use:

http://open.tracker.thepiratebay.org/announce
http://www.torrent-downloads.to:2710/announce
http://denis.stalker.h3q.com:6969/announce
udp://denis.stalker.h3q.com:6969/announce
http://www.sumotracker.com/announce

Put one of these in the tracker box

4. Do NOT tick the private torrent box (unless you’re using a private tracker)

5. Save the torrent and send it to your friends.

Categories: Computer Hardware Tags:

Nokia Codes Tips and Tricks

March 6th, 2009 No comments

To check the IMEI (International Mobile Equipment Identity)

Type-
*#06#
Information you get from the IMEI-
XX X
TAC FAC SNR SP

TAC = Type approval code
FAC = Final assembly code
SNR = Serial number
SP = Spare

To check the phones Software revision

Type-
*#0000#
Information you get from the Software revision-
V 05.31
18-02-99
NSE-3
1ST Line = Software revision
2ND Line = The date of the software release
3RD Line = Phone type

To enter the service menu

Type-
*#92702689# (*#WAR0ANTY#)
Serial number (IMEI)
Production date (MM/YY)
Purchase date (MM/YY) You can only enter the date once.
Date of last repair (0000=No repair)
Transfer user data to another Nokia phone via Infra-Red
Clock Stopping

To check weather your SIM Card supports clock stopping

Type-
*#746025625# (*#SIM0CLOCK#)

Revealing the Headphone and Car-Kit menus

Please note that if you do these next tricks, the new menus can’t be erased without retoring the factory default settings. To do these tricks you need to short-circuit the pins on the bottom of the phone next to where you plug in you charger.

1. To activate the “Headset” menu, you need to short-circuit pins “3” and “4”. After a short time the word “Headset” will be shown in the display. Menu 3-6 is now enabled.
2. To activate the “Car” menu, you need to short-circuit pins “4” and “5”. After a short time the word “Car” will be shown in the display. Menu 3-7 is now enabled.

The Reboot Trick

This should work on all software versions of the 6110.
1. Go to the Calendar (Menu-Cool
2. Make a note or reminder.
3. Enter some text into the edit box.
4. Hold “Clear” until the whole text is cleared, then press “Back”.
5. Press “0”. The main screen will now be showing but a space appears on the screen. (you can’t see it)
6. Enter 4 digits (e.g. 1234).
7. Use the down arrow to move the cursor to the left side of the numbers and the space (Down arrow twice).
8. Now enter 6 digits and press the call button.

Wait for a few seconds, the screen should start to flash and reboots. It should alsowork on other menus like the “Profiles” menu.

EFR CALL QUALITY

To activate EFR (Enhanced Full Rate) Enter the code-
*3370#
This improves call quality but decreases batterylife by about 5%
To deactivate it, Enter the code-
#3370#

THE JAMES BOND TRICK

If you short-circuit theleft middle and right pins on the bottom of the phone with all connections touching each other, the Nokia software hangs! The profile “Headset” will be activated. Before you do this just activate the “Automatic Answer” in the headset profile and set the ringing volume to “Mute”. Now you can use your phone for checking out what people are talking about in a room. Just place it under a table in a room and call it. The phone receives the call without ringing and you can listen to what people are saying.

NETWORK MONITOR

There is a hidden menu inside your Nokia phone. If you want to activate it, you’ll have to re-program some chips inside of your phone.
1. Check your software version. You can only continue if you have v4.33, v4.73 or v5.24.
2. Take apart the phone.
3. De-solder the EEPROM (ATMEL AT 24C64).
4. Read out the data with an EEPROM programmer and save it to a file (Backup).
5. If you have v.33 or v4.73, change the address “03B8” from “00” to “FF”.
6. If you have v5.24 then change the address “0378” from “00” to “FF”.
7. Write the new data to the EEPROM and solder it back to the phone,
8. Power on your phone and you should have “Netmonitor” enabled.
The Network Monitor gives you the following information.

Carrier number
MS RX Level in DBM
Received signal quality
MS TX power level
C1 (Path loss criterion, used for cell selection and reselection). The range is -99 to 99.
RTL (Radio link timeout).
Timeslot
Indication of the transmitter status
Information on the Network parameters.
TMSI (Temporary Mobile Subscriber Identity).
Cell identification (Cell ID, Number of cells being used).
MCC (Mobile country code)
MCN (Mobile network code)
LAC (Location area code)
Ciphering (On/Off)
Hopping (On/Off)
DTX (On/Off)
Discard cell barred information

CHECK SIM-LOCK

Note – If you bought your Nokia on UK Vodafone or UK Cellnet you do not need to check this because they both transmit on GSM900, and they don’t lock the phones. However if you bought your phone on UK Orange or UK One2one your phone may be blocked. The reason is that they both transmitt on GSM1800. To make a call on GSM1800 you need what is known as a “Dual band” phone. A dual band phone is able to transmit on both GSM900 and GSM1800, so they lock the phones so you can’t use it with any other network simcard. If you find that your phone is locked you can try different software to unlock it. (we havn’t found one that works yet), or you can ask your service provider who will gladly exchange the 10 digit code for about £35.
This is how to check the status of the 4 different locks. Aslo don’t try entering the wrong number, because after 3 times it will block the phone for good.

There are 4 different locks on your Nokia phone.
COUNTRY-LOCK
NETWORK-LOCK
PROVIDER-LOCK
SIMCARD-LOCK

The code to read out the sim-lock status of your phone is

#PW+(MASTERCODE)+(Y)#
# = DOUBLE-CROSS
W = PRESS “*” THREE TIMES
P = PRESS “*” FOUR TIMES
+ = PRESS “*” TWO TIMES
MASTERCODE = 1234567890
Y = NUMBER 1 TO 4
The master code is a secret code. The code has 10 digits, To read out the sim-lock status you can enter every combination you want!
“Y” Shows the status of the network-lock. Here you can enter a number from “1” to “4”. The “4” is for the sim-card lock.

SIM-LOCK CHECKS

#PW+1234567890+1# = GIVES PROVIDER-LOCK STATUS
#PW+1234567890+2# = GIVES NETWORK-LOCK STATUS
#PW+1234567890+3# = GIVES COUNTRY-LOCK STATUS
#PW+1234567890+4# = GIVES SIM-CARD-LOCK STATUS.

Categories: Computer Hardware Tags: