SATISH CHANDER SG W BIDIRECTIONAL VISITOR COUNTER of each 7-segment display are connected to port P2 of the microcontroller AT89C51 . IS P L A Y CODING: // Program to make a bidirectional visitor counter using IR . Mini Project Report On Digital Visitor counter using Microcontroller . ROOM APPLIANCE CONTROL WITH BIDIRECTIONAL VISITOR COUNTER. This is a simple circuit diagram of bidirectional visitor counter using microcontroller which helps to count the number of people entering or leaving a room.

Author: Kajizil Mezikazahn
Country: Slovenia
Language: English (Spanish)
Genre: Automotive
Published (Last): 21 July 2018
Pages: 77
PDF File Size: 7.95 Mb
ePub File Size: 12.55 Mb
ISBN: 198-5-54402-151-8
Downloads: 92018
Price: Free* [*Free Regsitration Required]
Uploader: Gale

The possible configurations for a diode are: A transistor, stands for transfer of resistance, is commonly used to amplify current.

Chart on the following page represents the center section of counrer microcontroller.

The voltage divider is the commonly used biasing mode. Interrupts An interrupt is a special feature which allows the to provide the illusion of “multitasking,” although in reality the is only doing one thing at a time.

The current is of considerable magnitude as it is dominantly constituted by the majority charge currents that is the hole current in the p-region and the electron countrr in the n-region. When working with ports, first of all it is necessary to choose which port we need to work with, and then to send data to, or take it from the port.

In this circuit, two infrared IR sensor modules are used each for up and down counting, respectively. Signature of the project guide MR. This didoe is similar to thyristor where the gate is disconnected. When the IR receiver does not receive a signal, the potential at the inverting input goes higher than that non-inverting input of the comparator IC LM Microcontroller vendors often make tools freely available to make it easier to adopt their hardware.


Microcontroller (AT89C51) based Digital Visitor Counter Project

We would like to thank our Director Dr. Even if the cost of a CPU that has integrated peripherals is slightly more than the cost of a CPU and external peripherals, having fewer chips typically allows a smaller and cheaper countrr board, and reduces the labor required to assemble and test the circuit board, in addition to tending to decrease the defect rate bidigectional the finished assembly. In short that means that microprocessor is the very heart of the computer.

It is defined at a point on the characteristic curves over a tangent. Log In Sign Up. This project can be used to count and display the number of visitors entering inside any conference room or seminar hall.

In reverse bias transition, the capacitance is the dominant and is given by: Let’s suppose we have the following protocol. A PIT may either count down from some value to zero, or up to the capacity of the count register, overflowing to zero. In case wiper is not used, it willoffer fixed resistance across the two connections. The charge carrier regions around the depletion regions are also called as the uncovered regions. Possible interrupt sources are device dependent, and often include events such as an internal timer overflow, completing an analog to digital conversion, a logic level change on an input such as from a button being pressed, and data received on a communication link.

Pin Description of BC is an NPN bi-polar junction transistor.

This block is in fact another free-run counter where our program needs to write a zero in every time it executes correctly. Micro-controller continuously monitor the Infrared Receivers, when any object passes through the IR Receiver’s then the IR Rays falling on the receiver are obstructed, this obstruction is sensed by the Microcontroller on countr board 1. Typically values range from 5 pF to 60 counfer.


However in conduction state, the current through the diode crystal remains stable. This project shows how to use the display and noDisplay methods to turn on and off the display.

Once the resistance measurement has been made, the multimeter can be turned off to preserve the batteries. The board can operate on an external supply of 6 viaitor 20 volts.

This is important in any application where anything to do with time or exact measurement is crucial. The emitter lead is indicated by a protruding edge in the transistor case. An ideal switch when open does not conduct current in either directions and in closed state conducts in both directions.

Automatic bidirectional visitor counter using 8051 microcontroller (AT89C51)

Memory is the first element, and we need a vsitor operation of our microcontroller. Typically used to add a reset button to shields which block the one on the board. When the IR receiver does not receive signal the potential at the inverting input goes ciunter than that that at non- inverting input of the comparator LM While some embedded systems are very sophisticated, many have minimal requirements for memory and program length, with no operating system, and low software complexity.