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DESIGN AND IMPLEMENTATION OF VENUE MONITORING AND DISPLAY SYSTEM AT DIT TEACHING TOWER

PROBLEM STATEMENT

DIT teaching tower is the building comprises  with more than 15 studying rooms(venues) there is lack of proper information about the free venue which leads lectures and students  consume a lot of time searching for free venue rather than studying

MAIN OBJECTIVE

The main objective of this project is to design venue monitoring and display system at DIT teaching tower

SPECIFIC OBJECTIVES

  • To design the circuit for monitoring venues
  • To select component for the designed circuit
  • To simulate the circuit
  • To build and test prototype

SIGNIFICANCE OF THE PROJECT

This project will have the following significances

  • Provide favorable environment to the student and lectures.
  • Provide minimum use of time searching for venues

EXISTING SYSTEM

The existing system to search for free venue is either teachers or class representatives or students to pass throughout the block and see if there is free venue or to pass throughout the institute time table and see if there is free room (venue). Due to this situation students and teachers waste  time to search for venue.

Liquid crystals display

  • Operating Voltage is 4.7V to 5.3V
  • Alphanumeric LCD module, meaning can display alphabets and numbers
  • Consists of four rows and each row can print 20 characters.
  • Each character is built by a 5×8pixel box


Atmega 328 Microcontroller

  • Number of pins: 28
  • CPU: 8-bit AVR
  • Operating voltage: 5V
  • Program memory: 32K
  • Input/output pins: 20
  • Temperature range: -40 to 105 degrees Celsius


According to Atmega328P datasheet load capacitance, for frequency range of 3.2 to 20MHz  ranges from 12pF to 16pF while ranges between 0.5pF and 5pF. Selecting 16MHz crystal then is 12pF and minimum i.e. 0.5pF

The value of parasitic capacitor and should be 23pF, for implementation standard value of capacitor should be considered. Hence, 22pF capacitor will be used.

Analysis of LED

Resistor limiting current R;

For Vcc= 5V

        VLED=3V

       ILED= 20mA

Now,

   Vcc= VLED + ILED.R

Then,

     R= (Vcc – VLED)/ ILED

      R= (5-3.) ÷ 20mA

       R = 100Ω

POWER SUPPLY

STEP DOWN TRANSFORMER

The relationship between the voltage and the number of turns in

each coil is given by


VOLTAGE REGULATOR

A voltage regulator generates a fixed output voltage of a preset magnitude that remains constant regardless of changes to its input voltage or load conditions. The circuit requires 5V for powering Microcontroller and LCD,  Therefore the 7805 voltage regulator chosen



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