Attendance system using Rf

Hi..I m going to make my final project on Attendance system using RF..i am just new to this.. Can you guys help me where to take a start.. for example which transmitter / reciever i use, then my supervisor advised me to use Kiel C as a microcontroller compiler..So how to communicate anntenas with Microcontroller ...WAiting for some positive and helpfull suggestion from the experts n fellows ..

Thank you in anticipation

WAiting ,,,,

first look for an RF module in your area.. only after you find one.. i can guide you further.
There are RF modules with UART interface so can be connected to controller directly. Please look for RF modules available.

WHETHR YOUR GOING TO DO LOW FREQUENCY OR HIGH FREQENCY RFID ? I WILL SURELY HELPS U!!!!!!!!

u dont need any transmitter receiver sort of thing....
u need RFID reader and RFID tags....
every thing else will be easy...
most of them work serially (UART) with 3v3 voltage level...
if with 51 u wud require level shifter (max 232 kinda)..
the data is a random data stored in the tag which are passive device (no power supply neeeded)...( try googling contact less smart cards on NXP website).
this random data can be used in the programme to identify the tag.

use RTC to fetch IN time and out time.
store it in some sort of memory (AT24c512).

Radio Frequency Identification ( RFID ) is one member in the family of Automatic Identification and Data Capture ( AIDC ) technologies and is a fast and reliable means of identifying just about any material object.

Primarily, the two main components involved in a Radio Frequency Identification system are the Transponder ( tags that are attached to the object ) and the Interrogator (rfid reader). Communication between the rfid reader and tags occurs wirelessly and generally does not require a line of sight between the devices.

An RFID transponder, considered as a next generation barcode, is a miniscule microchip that is attached to an antenna. They come in a wide variety of sizes, shapes, and forms and can be read through most materials with the exception of conductive materials like water and metal, but with modifications and positioning even these can be overcome.

Passive tags are generally smaller, lighter and less expensive than those that are active and can be applied to objects in harsh environments, are maintenance free and will last for years. These transponders are only activated when within the response range of a reader. The rfid reader emits a low-power radio wave field which is used to power up the tag so as to pass on any information that is contained on the chip.

Active tags differ in that they incorporate their own power source, where as the tag is a transmitter rather than a reflector of radio frequency signals which enables a broader range of functionality like programmable and read/write capabilities.

An RFID reader typically contains a module (transmitter and receiver), a control unit and a coupling element (antenna). The reader has three main functions: energizing, demodulating and decoding. In addition, readers can be fitted with an additional interface that converts the radio waves returned from the RFID tag into a form that can then be passed on to another system, like a computer or any programmable logic controller. Anti-Collision algorithms permit the simultaneous reading of large numbers of tagged objects, while ensuring that each tag is read only once.

I think using simple RF modules is a better idea than RFID because.. its a being used for a simple purpose.. moreover simple RF module is a cheaper than RFID readers..

Well i have a question in mind.. is it good to have a wireless attendance system? its easy to cheat such kind of system.. isn't it? I am not sure Please give your views on this..

u r right ajay but,
1) its an attendance system not security system.....
2) this is where RFID reader comes in to effect for RFID reader the tag has to be placed quite close to the reader for detection... thus aalthough being contactless card it is required to come very near to the system ...under cms range...
otherwise for simple rf-modules they usually has high detection range (so possibility if multiple attendance.. ).. plus Rf-modules are Transceiver (Transmitter and receiver ), where both the ends are active and need battery/power supply...plus if u are making an attendance system
use of RFID reader+ 50 tags is always less costly than usin 50 +1 RF-modules..

wow really nice... this thing never came to my mind

one more question.. how a tag is programmed to work with a specific reader?
tags are made on demand?

what this makes a reader and a tag binds together.. so that one tag can only work with a specific reader not with others..?

Well thnx for ur sharing ur views.. but for example we are going to make this for faculity.. we limit the detecting area with in university.. for example as teacher enter in the zone of university it detect the card or tag which the person have.

now the thing is this...if use everthing ready made.. as m from PAkistan.. here this Reader are only used by some multinational comapanies..not in institutions or local industry..so as final year project we want to use antennas and reciever as they are cheap and also we will made their circuit or board ourselef:)..

beside that we are just to our initial stages...and our idea or project is almost same as www.neotechid.com (made)

beside that valunerabilities are almost in every system though its manual or automatic.. so thats other issue i think

our main goal is to make attendance system using wireless technology and as RF tags can also track so for further work in tracking that can also help:)

i think its enough for this post ..so hope you bros/guys will help me or give me some better ideas:)

@Ajay

hmm ok lets say we are working on. RF Receiver - 433 MHz and STT433