Mini Project Report On Digital Visitor counter using Microcontroller ( AT89C51) A The object of this project is to make a controller based model to count. The Bidrectional Visitor Counter using Microcontroller is helpful to to Microcontroller as we are going to use this concept in this project. . AT89C51 ( based Microcontroller); Programmer; Push Button. tsofcom/bidirectional-visitor-counter/. Code To provide solution for this we are going to implement a project called “Digital Visitor Counter”. Microcontroller: This is the CPU (central processing unit) of our project.

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Manufacturers have often produced special versions of their microcontrollers in order to help the hardware and software development of the target system. For low voltage applications, more preference will be given to reduce the noise of the whole circuit. AT89C51 is an 8-bit microcontroller and belongs to Atmel’s family.

Bidirectional Visitor Counter

Chapter 7 introduces proposed future work and conclusions and then the bibliography. Where power consumption is important as in battered devices, interrupts may also wake a microcontroller from a low-power sleep state where the processor is halted until required to do something by a peripheral event.

Your email address will not be published. However, on Windows, a. Rotating the potentiometer controls the brightness of the LCD backlight. For high voltage applications, they are mainly designed to reduce a phenomenon called arcing.

When the operating voltage is applied the relay coil gets energized and the COM changes contact to NO. Two of the pins are for the crystal oscillator. For the erasable variants, quartz was required, instead of less expensive glass, for its transparency to ultraviolet—glass is largely opaque to UV—but the main cost differentiator was the ceramic package itself.

Automatic bidirectional visitor counter using 8051 microcontroller (AT89C51)

A command is vvisitor instruction given to LCD to do a predefined task like initializing it, clearing its screen, setting the cursor position, controlling display etc. And counting is displayed on a 7 Segment LED through the controller.


The LCD back light pins are connected to 5V and ground as shown in the diagram below: By modifying this circuit and using two relays we can achieve a task of opening and closing the door. This power supply circuit diagram is ideal for an average current requirement of 1Amp.

Nicrocontroller this LCD each character is displayed in 5×7 pixel matrix.

Other designs are purpose built for control applications. The output section consists of contactors which connect or disconnect mechanically. To overcome this problem, the camera on a cellphone can be used. In a basic relay there are three contactors: I am tahir from Bahrain. Two terminals are used to give the input DC voltage also known as the operating voltage of the relay.

Thus a small sensor circuit can drive, say, a fan or an electric bulb.

Krishna Reddy whose teachings has been pivotal for us in all aspects of our life. Visittor is 2, bytes. It supports all kinds of data, from slow mouse inputs to digitized audio and compressed videos also allows hot swapping. Interface GPS with Arduino. What is the maximum count that can be stored in this project?

Typically used to add a reset button to shields which block the one on the board. Out of these two are the coil terminals.

Even if the cost of a CPU projetc has integrated peripherals is slightly more than the cost of a CPU and external peripherals, having fewer chips typically allows a smaller and cheaper circuit board, and reduces the labor required to assemble and test the circuit board, in addition to tending to decrease the defect rate for the finished assembly.

A customizable microcontroller incorporates a block of digital logic that can be personalized for additional processing capability, peripherals and interfaces microcoontroller are adapted to the requirements of the application.


In case wiper is not used, it willoffer fixed resistance across the two connections. Interpreters are often used to hide microcontropler low level quirks. If adequate heat sinking is provided, they can deliver over 1A output current. While some baased systems are very sophisticated, many have minimal requirements for memory and program length, with no operating system, and low software complexity. And it contains following blocks:. See also the mapping between Arduino pins and ATmega ports.

By default, they measure from ground to 5 volts, though is it possible to change the upper end of their range using the AREF pin and the analogReference function.

These “mask programmed” parts have the program laid down in the same way as the logic of the chip, at the same visitorr. Micro-controller read these signals and sends commands to 7 segment LED display. LM has inbuilt two low noise op-amp. Click here to sign up.

Microcontroller (AT89C51) based Digital Visitor Counter Project

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. This circuit uses a microcontroller which ensures the projecg of the circuit, due to which this circuit can easily be integrated or assembled with other modules or circuits where ever required.

Additionally, some pins have specialized functionality: The “hot-swapping” means that the devices can be plugged and unplugged without rebooting the computer or turning off the device. Sreenivasa Reddy, Associate Professor, Head of the Department of Electronics and Communications for inspiring us to take up a project on this subject and successfully guiding us towards its completion.