Automatic Bidirectional Visitor Counter

Topics: Light-emitting diode, Infrared, Nixie tube Pages: 6 (1822 words) Published: May 27, 2013
Automatic Bidirectional Visitor Counter
Project Report

Automatic Bidirectional Visitor Counter
Project Report

Table of Contents
Executive Summary2
Components Used3
Light emitting diodes (LEDs) 4
Infrared Sensors 4
Seven Segment Display 6
Transistors 7
Future Development8

1. Executive Summary
The objective of the project was to create a circuit with an 8051 microcontroller that senses when an object passed through an infrared receiver’s receive path to automatically turn on lights and count how many times the receive path was blocked. 2. Introduction

Digital visitor counter is a reliable circuit that takes over the task of counting number of Persons/ Visitors in the Room very accurately. When somebody enters into the Room then the Counter is Incremented by one. The total number of Persons inside the Room is displayed on the seven segment display module. The microcontroller does the above job it receives the signals from the sensors, and this signals operated under the control of software which is stored in ROM. It can be used to count the number of persons entering a hall in the up mode at entrance gate. In the down mode, it can count the number of persons leaving the hall by decrementing the count at exit gate. It can also be used at gates of parking areas and other public places. This circuit divided in three parts: sensor, controller and counter display. The sensor would observe an interruption and provide an input to the controller which would run the counter in up/down mode depending upon the selector setting. The same count is displayed on a set of 7-segment displays through the controller. This project we will create counter system for apply. The total number of object is displayed on the seven segment display. The system is fully controlled by the 16 bit microcontroller 8051 which has a 4Kbytes of ROM for the program memory. It can also be used at gates of parking areas and other public places. 3. Working

In this circuit, two infrared (IR) sensor modules are used each for up and down counting, respectively. Whenever an interruption is observed by the first IR sensor, it increments the counter value. Similarly, when the second sensor detects an obstacle, the count is decremented. The count value is calculated depending upon the sensors’ input and is displayed on a set of four seven segment displays by using the concept of multiplexing (for concept of multiplexing refer seven segment multiplexing). The Working data pins of each 7-segment display are connected to port P2 of the microcontroller AT89C51. The first four pins of port P1 (P1^0-P1^3) are connected to control pins to enable a particular 7-segment. P1^5 & P1^6 are configured as input pins at which the sensors are connected. The sensor inputs are defined as up and down selector modes for the counter in the code. Each time the first sensor is blocked, it gives a high signal at P1^5 and the count value gets incremented. The value gets decremented when P1^6, connected to second sensor, gives high input. At each step, the value of the counter is sent to be displayed on the segments.

4. Components Used
* 89C51
89c51 is a low power, high performance CMOS 8 bit controller with 8K of in system programmable Flash memory. By combining a versatile 8 bit CPU within system programmable flash on a monolithic chip, the atmel AT89c51 is a powerful computer which provides a high flexibility and cost effective solutions to many embedded control applications. It is based on an 8 bit central processing unit with an 8 bit Accumulator and another 8 bit B register as main processing blocks. Other portions of the architecture include few 8 bit and 16 bit registers and 8 bit memory locations. Each 8051 device has some amount of data RAM built in...
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