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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They are specified by their fixed value resistance. Bytes are sent as a single character read: The library works with in either 4- or 8-bit mode i.

When the IR receiver module receives signal to the potential at the inverting input goes low. If using more than 12V, the voltage regulator may overheat and damage the board. The significant feature of this project is that it detects the entry of visitors from a single door itself. The input voltage to the Arduino board when it’s using an external bodirectional source as opposed to 5 volts from the USB connection or another regulated power source.

The decision of which peripheral to integrate is often difficult.

Janardhana Raju, Dean School of Engineering for providing us countfr means of attaining my cherished goals. Volatile memory RAM for data storage. Pin Mapping For Arduino 3. ICxx to Hold Heatsink. Using IC is very suitable for this job. So the user needs not worry about terminations, terms such as IRQs and port addresses, or rebooting the computer. This pin is connected with GND. When the operating voltage is applied the relay coil gets energized and the COM changes contact to NO. By using this circuit and proper power supply we can implement various applications such as fans, tube lights, etc.


The microcontroller vendors often trade operating frequencies and system design flexibility against time-to-market requirements from their customers and overall lower system cost.

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

The total number of persons entering the room is displayed on the 7 segment LED displays. As shown, the power source is given to the electromagnet through a control switch and through contacts to the load. However, on Windows, a.

When the IR receiver bisitor not receive a signal, the potential at the inverting input goes higher than that non-inverting input of the comparator IC Mcirocontroller De-Energized Relay OFF In simple, when a voltage is applied to pin 1, the electromagnet activates, causing a magnetic field to be developed, which goes on to close the pins 2 and 4 causing a closed circuit. Our experience with her here during this study has been extremely helpful and enriching for us.

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. That means, when plugged in, everything configures automatically. An IR output terminal of the receiver varies depending upon its receiving of IR rays.

Now let us take the different steps that occur in a relay. This integration drastically reduces the number of microcintroller and the amount of wiring and circuit board space that would be needed to produce equivalent systems using separate chips.

A switch is connected to the load. The other two terminals are needed for the coil. The Arduino software includes a serial monitor which allows simple textual data to be sent to and from the Arduino counetr.

Microcontroller (AT89C51) based Digital Visitor Counter Project

This circuit divided in three parts: A transistor, stands for transfer of 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. Serial Communication Between Board and Laptop Thus, if you use these functions, you cannot also use pins 0 and 1 for digital input or output.


In a basic relay there are three contactors: He really considers deeply about the welfare of the students. This chip would find its way into over one billion PC keyboards, and other numerous applications. It can be used to control various appliances and equipment with large current. Relays are available in microcontrolled operating voltages like 6V, 12V, 24V etc.

Automatic bidirectional visitor counter using 8051 microcontroller (AT89C51)

When the relay is deactivated, the circuit connects. 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. In this project, the transmitter section includes an IR sensor, which transmits continuous IR rays to be received by an IR receiver module.

Relay control port Output: The use of field- programmable devices on a microcontroller may allow field update of the firmware or permit late factory revisions to products that have been assembled but not yet shipped. It has mainly eight relay terminals.

Capacitors of suitable values can be connected at input and output pins depending upon the respective voltage levels.

There are two colors shown. This pin is connected with VCC.