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In this project we will make project on RF attendance using RF ID. For RF attendance we will transfer Roll no of student wirelessly and on rxer end we will mark his/her attendance in mircontroller. We have option to check the attendance of each student.

We will use RF technology for this purpose.

RF remote control which is built using HT12E and HT12D chips. The remote control is built using RF encoder chip HT12E that will generate different codes. These codes will be transmitted by 434 MHz RF transmitter. At the receiving side these codes will be received by 434 MHz RF receiver and decoded by RF decoder chip HT12D. in the transmitter side which will attach with car we will sensor for accident detection. Sensors will give signal to HT12E . HT12E is a 18 pin ic. It converts  bit data input to serial output. It has 12 address lines to send data to particular receiver.

In this project we make attendance system using RFID. In this project we used 433Mhz RF transmitter and Receiver. We used 89s51 . LCD 16*2 connected to MCU at port 0 of MCU. Output of HT12D connected to MCU at port pin no 1 tp 4. Pot 1 pin 5 to 8 connected to four switches to check total attendance of each candidate. In this project we are using UHF frequencies of RF. LEDís connected at port 2 pin p2.0,p2.1,p2.2,and p2.6. LCD rs, rw ,en connected to p2.5,p2.4 and p2.3.HT12 E and HT12D Ďs pin 1 to 9 connected to ground giving low. These are address pins of HT12E and HT12D. Pin no 10 to 14 of HT12 E are inputs of IC and 17 no pin is output pin. Pin no 10 -14 of  HT12D is ouput pin and 14 is input pin. Crystal pin of HT12E is 15 and 16 .this  project we will  make one transmitter and RF receiver. RF remote control which is built using HT12E and HT12D chips. The remote control is built using RF encoder chip HT12E that will generate different codes. These codes will be transmitted by 434 MHz RF transmitter. At the receiving side these codes will be received by 434 MHz RF receiver and decoded by RF decoder chip HT12D. These codes are fed to 89C51 to take a controlling action on moon walker. We will use 16*2 LCD display.there will be RFID for each  transmitter. RF transmitter will give signal to

For the regulated power supply we use ic 7805 as a regulator to provide a fix 5 volt power supply.

 Here we use pc 817 ( 4 pin opto coupler) to interface the micro controller with  the HT12E

Pin no 1of RF tx module is ground . second is for data , third for VCC and fourth for antenna Transmitter

For energy Zone we will get output at pin p3.4,5,6,7 of mircontroller.

 

It gives low signal to MCU. For in LED will glow and for out LED will not glow or stop glowing.