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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Programmable memory also reduces the lead time required for deployment of a new product.

The purpose of an optocoupler is to transfer signals from one circuit to another yet keep them galvanically isolated. This integration drastically reduces the number of chips and the amount of wiring and circuit board space that would be needed to produce equivalent systems using separate chips.

The same count is displayed on a set of 7-segment displays through the controller. It has short circuit protection, thermal overload protection.

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

These terminals are further divided into two pairs. It can be used to count the number of persons entering a hall in the up mode at entrance gate. Used with analog Reference. Interface SD Card with Arduino.

Thus the switch plays an important role in the relay working. The recommended range is 7 to 12 volts. Simulators are available for some microcontrollers. It can also be used at gates of parking areas and other public places.


The outputs of comparators are connected to digital pin number 9 of Micro-controller.

I am built this dc regular circuit, is the first project. This is a voltage is about 12Vdc.

Microcontroller (AT89C51) based Digital Visitor Counter Project

Serial communication works on 1s and 0s. Because it is easy to use, easy to buy, as popular applications, and it is 805 cheap. A small control coil is connected onto the control circuit.

That means USB-bus allows many peripherals to be connected using a single standardized interface socket. Here an operational op-amp of LM is used as comparator circuit Figure 4.

And when the resistance falls making available a voltage to the non-inverting input higher than inverting input, so that the output of comparator is logic high. The result of their work was the TMSwhich became commercially available in We would like to thank our Director Dr. 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 Manufacturers have to balance the need to minimize the chip size against additional functionality.

Wastage of electricity is one of the main problems which we are facing now a day. When the IR receiver module receives signal to the potential at the inverting input goes low.

Interpreter firmware is also available for some microcontrollers. Whenever an interruption is observed by the first IR sensorit increments the counter value. Click the serial monitor button in the toolbar and viisitor the same baud rate used in the call to begin. When there is no voltage on pin 1, there will be no electromagnetic bidirectionl and thus no magnetic field. Arduino based GPS receiver.


They are used to time the delay open and delay close of contacts. We would like to thank Mr. This project shows how to use the display and noDisplay methods to turn on and off the display.

Automatic bidirectional visitor counter using 8051 microcontroller (AT89C51)

Each pole has contacts that can be thrown in mainly three ways. Relays are available in different operating voltages like 6V, 12V, 24V etc. This force will be almost equal to half the strength of the magnetic force.

Main concept behind this project is to measure and display the number of persons entering in any room like seminar hall, conference room. The total number of persons entering the room is displayed on the 7 segment LED displays. Once it reaches zero, it sends an interrupt to the processor indicating that it has finished counting.

Depending on the device, the program memory may be permanent, read-only memory that can only be programmed at the factory, or it may be field-alterable flasher erasable read-only memory. By using this circuit and proper power supply we can implement various applications such as fans, tube lights, etc.

The voltage regulator IC maintains the output voltage at a constant value. Potentiometer is used for setting reference voltage at comparators one terminal and IR sensors sense the object or person and provide a change in voltage at comparators second terminal.