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.
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. LED’s 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 ‘s 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.