8 CANDIDATE QUIZ BUZZER USING 8051 MICRO CONTROLLER (AT89C51)
#1

[attachment=9527]
POWER SUPPLY
The input to the circuit is applied from the regulated power supply. The a.c. input i.e., 230V from the mains supply is step down by the transformer to 5V and is fed to a rectifier. The output obtained from the rectifier is a pulsating d.c voltage. So in order to get a pure d.c voltage, the output voltage from the rectifier is fed to a filter to remove any a.c components present even after rectification. Now, this voltage is given to a voltage regulator to obtain a pure constant dc voltage
Transformer
Usually, DC voltages are required to operate various electronic equipment and these voltages are 5V, 9V or 12V. But these voltages cannot be obtained directly. Thus the a.c input available at the mains supply i.e., 230V is to be brought down to the required voltage level. This is done by a transformer. Thus, a step down transformer is employed to decrease the voltage to a required level.
Rectifier
The output from the transformer is fed to the rectifier. It converts A.C. into pulsating D.C. The rectifier may be a half wave or a full wave rectifier. In this project, a bridge rectifier is used because of its merits like good stability and full wave rectification
The Bridge rectifier is a circuit, which converts an ac voltage to dc voltage using both half cycles of the input ac voltage. The Bridge rectifier circuit is shown in the figure. The circuit has four diodes connected to form a bridge. The ac input voltage is applied to the diagonally opposite ends of the bridge. The load resistance is connected between the other two ends of the bridge.
For the positive half cycle of the input ac voltage, diodes D1 and D3 conduct, whereas diodes D2 and D4 remain in the OFF state. The conducting diodes will be in series with the load resistance RL and hence the load current flows through RL.
For the negative half cycle of the input ac voltage, diodes D2 and D4 conduct whereas, D1 and D3 remain OFF. The conducting diodes D2 and D4 will be in series
with the load resistance RL and hence the current flows through RL in the same direction as in the previous half cycle. Thus a bi-directional wave is converted into a unidirectional wave.
Filter
Capacitive filter is used in this project. It removes the ripples from the output of rectifier and smoothens the D.C. Output received from this filter is constant until the mains voltage and load is maintained constant. However, if either of the two is varied, D.C. voltage received at this point changes. Therefore a regulator is applied at the output stage.
Voltage regulator
As the name itself implies, it regulates the input applied to it. A voltage regulator is an electrical regulator designed to automatically maintain a constant voltage level. In this project, power supply of 5V and 12V are required. In order to obtain these voltage levels, 7805 and 7812 voltage regulators are to be used. The first number 78 represents positive supply and the numbers 05, 12 represent the required output voltage levels. The L78xx series of three-terminal positive regulators is available in TO-220, TO-220FP, TO-3, D2PAK and DPAK packages and several fixed output voltages, making it useful in a wide range of applications. These regulators can provide local on-card regulation, eliminating the distribution problems associated with single point regulation. Each type employs internal current limiting, thermal shut-down and safe area protection, making it essentially indestructible. If adequate heat sinking is provided, they can deliver over 1 A output current. Although designed primarily as fixed voltage regulators, these devices can be used with external components to obtain adjustable voltage and currents.
2.2 AT89C51 Microcontroller
MICROCONTROLLERS

Microcontrollers’ producers have been struggling for a long time for attracting more and more choosy customers. Every couple of days a new chip with a higher operating frequency, more memory and more high-quality A/D converters comes on the market.
Nevertheless, by analyzing their structure it is concluded that most of them have the same (or at least very similar) architecture known in the product catalogs as “8051 compatible”. What is all this about?
The whole story began in the far 80s when Intel launched its series of the microcontrollers labeled with MCS 051. Although, several circuits belonging to this Series had quite modest features in comparison to the new ones; they took over the world very fast and became a standard for what nowadays is meant by a word microcontroller.
The reason for success and such a big popularity is a skillfully chosen configuration which satisfies needs of a great number of the users allowing at the same time stable expanding ( refers to the new types of the microcontrollers ). Besides, since a great deal of software has been developed in the meantime, it simply was not profitable to change anything in the microcontroller’s basic core. That is the reason for having a great number of various microcontrollers which actually are solely upgraded versions of the 8051
Reply
#2
plz kindly send me a detailed project related above subject. also the programming using macro c software.
Reply
#3
sample documentation
Reply
#4

sir can you please provide me with the circuit diagram of the project
Reply

Important Note..!

If you are not satisfied with above reply ,..Please

ASK HERE

So that we will collect data for you and will made reply to the request....OR try below "QUICK REPLY" box to add a reply to this page
Popular Searches: electronic buzzer working principle, stress quiz, literature survey on 8 candidate quiz buzzer using 8051 microcontroller at89c51, project report of 8 candidate quiz buzzer using at89c51, micro controller 8051 introduction, viva questions on 8051 microcontroller based quiz buzzer system, dtmf controlled electrical device switching using 8051 micro controller,

[-]
Quick Reply
Message
Type your reply to this message here.

Image Verification
Please enter the text contained within the image into the text box below it. This process is used to prevent automated spam bots.
Image Verification
(case insensitive)

Possibly Related Threads...
Thread Author Replies Views Last Post
  MICRO CONTROLLER BASED SECURITY SYSTEM USING SONAR ajukrishnan 5 7,146 31-01-2015, 11:55 PM
Last Post: Guest
  IMPLEMENTATION OF SRAM USING MICRO WIND TOOL projectsofme 2 2,711 11-04-2013, 10:53 AM
Last Post: computer topic
  DISTRIBUTED CALL ADMISSION CONTROL SCHEME FOR MOBILE MICRO-CELLULAR NETWORKS project topics 2 2,934 24-01-2013, 09:31 PM
Last Post: fake_lover01
  Maximum Power Point Tracking Controller for PV Systems using a PI Regulator project topics 1 3,067 19-01-2013, 12:51 PM
Last Post: seminar details
  RADIO NETWORK CONTROLLER FOR 3G MOBILE AND WIRELESS NETWORK DEVICES seminar presentation 4 5,321 22-12-2012, 10:52 AM
Last Post: seminar details
  Radio Network Controller computer science crazy 1 1,802 22-12-2012, 10:52 AM
Last Post: seminar details
  A BRIEF INTRODUCTION TO 8051 MICROCONTROLLER seminar class 2 4,561 14-12-2012, 12:46 PM
Last Post: seminar details
  Swarming Micro Air Vehicle Networks SMAVNET seminar class 1 1,961 17-10-2012, 03:21 PM
Last Post: seminar details
  DESIGN OF A DUAL ELEVATOR CONTROLLER seminar surveyer 1 4,088 07-06-2012, 11:14 AM
Last Post: computer girl
  8051 Project: Automatic Lighting and Visitor Counter projectsofme 1 2,272 16-02-2012, 10:54 AM
Last Post: seminar paper

Forum Jump: