microcontroller (AT89C51). Introduction: A counter that Code: // Program to make a bidirectional visitor counter using IR sensor. #include. On Digital Visitor counter using Microcontroller (AT89C51) A Mini Project . ROOM APPLIANCE CONTROL WITH BIDIRECTIONAL VISITOR COUNTER ECE Department, NNRG 2 AUTOMATIC ROOM APPLIANCE CONTROL WITH. Figure shows internal architecture of microcontroller. 19 The objective of Bi-directional visitor counter is to count the number of visitors presented in a This Project “Automatic Continuous Visitor Monitoring System using AT89C51 [5] using

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The proposed approach has been evaluated on the results in the below. Microcontrollers typically do not have a math coprocessor, so floating point arithmetic is performed by software. So you can connect and disconnect automaric load by controlling the level of the control signal port. Of these 2, bicirectional Atmega is the upgraded, more advanced chip. When the relay is deactivated, the circuit connects.

Chapter 2 explains the power supply used in this project. The significant feature of this project is that it detects the entry of visitors from a single door itself.

WORLD OF EMBEDDED: Automatic bidirectional visitor counter using microcontroller (AT89C51)

Since this project uses 2 infrared sensors, it can be used as Bidirectional person counter as well. Each pole has contacts that can be thrown in mainly three ways. This is a voltage is about 12Vdc.

All the 32 registers are directly connected to the Arithmetic Logic Unit ALU microconyroller, allowing two independent registers to be accessed in one single instruction executed in one clock cycle.

The data register stores the data to be displayed on the LCD. Out of the six terminals two of them are coil terminals. Cost has plummeted over time, with the cheapest 8-bit microcontrollers being available for under 0.


Therefore, utilization of these resources for power supply is the best possible way of producing, conserving and renewing energy, which is advantageous as it is pollution free, affordable, and free from environmental impacts. An IR output terminal of the receiver varies depending upon its receiving of IR rays.

Micro-controller read these signals and sends commands to 7 segment LED display. Configured to the output state, GPIO pins can drive external devices such as LEDs or motors, often indirectly, through external power electronics. All the components required are readily available in the market and the circuit is easy to build. Automatic bidirectional visitor counter using microcontroller AT89C It is a member of 78xx series of fixed linear voltage regulator ICs.

The circuit given here can count numbers from 0 to in up and down modes depending upon the state of the selector.

Automatic bidirectional visitor counter using 8051 microcontroller (AT89C51)

A customizable microcontroller incorporates a block of digital logic that can be personalized for additional processing capability, peripherals and interfaces that are adapted to the requirements of the application. By using this circuit and proper power supply we can implement various applications such as fans, tube lights, etc. Simulators are available for some microcontrollers. Enter the bidircetional address you signed up with and we’ll email you a reset link.

When there is no voltage on pin 1, there will be no electromagnetic force and thus no magnetic field. Other versions may be available where the ROM is accessed as an external device rather than as internal memory, however these are becoming rare due to the widespread availability of cheap microcontroller programmers.

Microcontroller (AT89C51) based Digital Visitor Counter Project

That means counter will be incremented if person enters the room. On the other hand, if the relay was already de-energized when the contacts were closed, then the contact move oppositely and make an open circuit Figure 4. The decision of which peripheral bidireectional integrate is often difficult.


Compilers and assemblers are used to convert both high-level and assembly language codes into a compact machine code for storage in the microcontroller’s memory. Since this variation cannot be analyzed as such, therefore this output can be fed to autoomatic comparator circuit. Internal Guide Head of the Department Mr.

This allows a part to be used in a wider variety of applications than if pins had dedicated functions.

The wavelengths of these regions and their applications are shown below. So the user needs not worry about terminations, terms such as IRQs and port addresses, or rebooting the computer. The Arduino software includes a serial monitor which allows simple textual data to be sent to and from the Arduino board.

Usually in the infrared spectrum, all the objects radiate some form of thermal radiations. This project shows how to use the display and noDisplay methods to turn on and off the display.

Similarly, when the second sensor detects an obstacle, the count is decremented.

This high-density System-in-Package SiP integrates controller, power switches, and support components. BC is an NPN bi-polar junction transistor.

The input section has a coil which generates magnetic field when a small voltage from an electronic circuit is applied to it.