The main aim of the project is to count the number of persons present in a room and display it in on seven segment displays. Use of embedded technology makes this closed loop feedback control system efficient and reliable. Micro controller (AT89C51) allows dynamic and faster control. AT89C51 micro controller is the heart of the circuit as it controls all the functions.
The system comprises of two IR
Transmitter-Receiver pairs, one of which is located in front of the door
outside the room. The other pair is located inside the room.
Whenever a person
tries to enter into the room, the receiver of first IR pair identifies the
person. Then the microcontroller identifies this and increments the count to 1.
Similarly as the persons enter into the room, the count will be incremented and
this count will be displayed on seven segment display.
This project uses regulated 5V,
500mA power supply. 7805 three terminal voltage regulator is used for voltage
regulation. Bridge type full wave rectifier is used to rectify the ac out put
of secondary of 230/12V step down transformer.