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RFID BASED ATTENDANCE SYSTEM +TX ,RX[9/9/08]

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say2paul

Thu Aug 21 2008, 08:00AM

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Dear Arun, I never used RF transceivers. So I was bit curious for the security thing in RF transmission.

I mean to say that is the data we transmit using RF transmitter protected by a password..?

When I used RFID MIFARE Card reader/writter, the data was protected by two passwords..

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ramdasi vaibhav

ramdasi vaibhav

Thu Aug 21 2008, 08:36AM

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Thank u arun sir.
I think 433mhz module will do for range of 120meters,won't it?

ramdasi vaibhav

Thu Aug 21 2008, 08:38AM

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What is RFID MIFARE,say2paul,will u plz explain it?

say2paul

Thu Aug 21 2008, 09:55AM

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To make it simple for you..

MIFARE card is fundamentally just a memory storage device, where the memory is divided into segments and blocks with simple security mechanisms for access control. They have limited computational power. Their reliability and low cost, those cards are widely used for electronic wallet, access control, corporate ID cards, transportation or stadium ticketing.

The MIFARE Classic 1k offers 1024 bytes of data storage, split into 16 sectors; each sector is protected by two different keys(password), called A and B. They can be programmed for operations like reading, writing.

MIFARE Classic 4k offers 4096 bytes split into forty sectors, of which 32 are same size as in the 1K with eight more that are quadruple size sectors.

MIFARE Classic mini offers 320 bytes split into five sectors. For each of these card types, 16 bytes per sector are reserved for the keys and access conditions and can not normally be used for user data.

Each sector contains 4 blocks, out of which only 3 blocks can be used to write data. Each block can contain maximum of 16 bytes of data.

The very first 16 bytes contain the serial number of the card and certain other manufacturer data and are read only. That brings the net storage capacity of these cards down to 752 bytes for Classic 1k, 3440 bytes for Classic 4k, and 224 bytes for Mini.

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ramdasi vaibhav

sashijoseph

Thu Aug 21 2008, 12:01PM

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You could encrypt the data you transmit,for security.A lil extra work for the micro,that's all.
We even have such a project in the download section.

Let there be music........

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ramdasi vaibhav

Arun Kumar V

Thu Aug 21 2008, 07:41PM

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@paul

I mean to say that is the data we transmit using RF transmitter protected by a password..?

to ensure the data transmitted is protected, we can use cipher and decipher technique, for eg: when the micro sends data thru RF Tx, we can add some special character to each byte say ascii "a" and at the Rx side we can Subtract "a" from the each byte received to get actual data. you can use different algorithms

@Vaibhav

since your guide has given discount in range, you can try normal RF Modules but make sure they have proper external Antenna

Arun

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ramdasi vaibhav

Fri Aug 22 2008, 09:28AM

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i have some faqs regarding rfid attndance project:

1. I wouid lik to know crystal clr working of circuit and the diff devices used.
e.g. RFID reader, tags,real time clock ,database storage in ram,role of uC so that i can start preparing my project synopsis and initial report to be submtd to my guide.
2.Possible modifications to suit todays standard or disadvantages if any to be rectified .
3.Does reader detect tags around certain area of coil only?( as shown in dia). This is vital bcz i want it should detect tags of those students present in the class or sitting on benches at that instant.Bcz i want that rfid attendance should work behind the curtains ,i mean students shouldn't have to take any extra efforts to make attendance by coming in vicinity of reader,b'cz it will consume time and may create lil chaos in class.

[ Edited Fri Aug 22 2008, 09:36AM ]

ramdasi vaibhav

Fri Aug 22 2008, 09:29AM

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4.What if a student wears more than one tag?

Should i use high power (or freq ?..plz clr this pt i 've doubt here) rfid reader for this ?

thanks in advance.

[ Edited Fri Aug 22 2008, 09:38AM ]

ExperimenterUK

Fri Aug 22 2008, 01:55PM

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RFID systems are typically short range.
Usually the more secure the system, the shorter the range to prevent
eavesdropping.
For Mifare cards 10cm is a long way

I think students will have to swipe their tag past a detector to prove
they attended.

Learning all the time

Ajay

Sat Aug 23 2008, 12:41AM

Rickey's World Admin

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better use a short range RFID.. you can enclose the reader in a box with appropriate distance, students have to present the card and ofcourse that will prevent errors.

You can give indicators for successful/unsuccessful attendence.

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