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.

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And counting is displayed on a 7 Segment LED through the controller. Thus the switches remain open. The first one consists of as many lines as the amount of memory we wish to address and the other one is as wide as data, in our case 8 bits or the connection line. The holes supplied by the n-region must be driven to the p region which is physically impossible. Thus the upper contact arm starts to be attracted to the lower fixed arm and thus closes the contacts causing a short circuit for the power to the load.

During the breakdown, the minority charge carriers ionize the coumter atoms which are followed by a chain ionization to generate a large number of free charge carriers.

Suppose we are working with three lines only, and that one line is used for sending data, other for counterr, and the third one is used as a reference line for both the input and the output side.


Signature of the project guide MR. Compilers for general purpose languages will typically have some restrictions as well as enhancements to better support the unique characteristics of microcontrollers.

Thus the output of the comparator goes low and the LED does not glow.

Automatic bidirectional visitor counter using 8051 microcontroller (AT89C51)

We wish to use this visitof for its desired motive and live a life dedicated to ultimate welfare of society. Bit memory actually resides in internal RAM, from addresses 20h through 2Fh. Pin Mapping For Arduino 3. Clipper- Diode can be used to clip off some portion of pulse without distorting the remaining part of the waveform.

Chapter 1 introduces with our project and explains the background review.

Read more about IR sensors. When the IR receiver module receives signal to the potential at the inverting input goes low. Control line is used in the following way: Configured to the output state, GPIO pins can drive external devices such as LEDs or motors, often indirectly, through external power electronics. It acts as a photodetector in the sense that it can convert the incident light into visihor response.

Microcontroller (AT89C51) based Digital Visitor Counter Project

It won’t be a particularly good capacitor in terms of its storage capacity, but it will work. At each step, the value of the counter is sent to be displayed on the segments.


Serial bidireftional works on 1s and 0s. To read into external memory. Help Center Find new research papers in: Rotating the potentiometer controls the brightness of the LCD backlight. This high-density System-in-Package SiP integrates controller, power switches, and support components.

This will help to save electricity. Also, high wattage resistors can be made by using a thick wire material. A wire wound resistor is made of metal resistance wire, and because of this, they can be manufactured to precise values.

Simulators are available for some microcontrollers. However, there is no reset button we can push on the microcontroller and thus viitor our problem. This pin is connected with GND. The minority current is due to electron hole pairs generated thermally and dependent upon temperature. Address latch enable which is used to access the address locations from external memory.

They are also used in automobiles, washing machines, microwave ovens, toys Two terminals are used to give the input DC voltage also known as the operating voltage of the relay.