This document presents an automatic bell ringing system using a microcontroller. The system uses a step-down transformer to power the microcontroller and other components. An LCD screen displays the time and schedule. A buzzer sounds according to the programmed schedule, such as every hour. The system is designed to automatically ring a bell in schools and colleges to avoid human errors. It has applications in education, industry, and other areas where an automatic scheduling system is needed.

1. Guide Presented by
Mrs.Shaik Gulnaz V.Abhinav Kumar 11E31A0422
Asst.Professor K.Shiva Kumar 11E31A0423
K.Rajashekar 11E31A0424
K.Chaithanya Sree 11E31A0428
K.Pramitha 11E31A0429

2. INTRODUCTION
 A bell is a percussion instrument used in schools and
colleges.
 This design takes over the task of ringing the bell in
various institutions.
 The bell would ring automatically at the schedule time.

3. BLOCK DIAGRAM

4. POWER SUPPLY

6. Transformer
 In the power supply we use step down transformer.
 It converts 230V Ac to 12V AC.

7. MICRO CONTROLLER
 We are using Atmega8 microcontroller.

8. Features of micro controller
 Advanced RISC Architecture
 Up to 16 MIPS Throughput at 16 MHz
 8K Bytes of In-System Self-Programmable Flash
 512 Bytes EEPROM
 1K Byte Internal SRAM

9. LCD LED

10. LCD
 It is used to show current time and various messages.
 LCD (Liquid Crystal Display) screen is an electronic
display module and find a wide range of applications.
 A 16x2 LCD display is very basic module and is very
commonly used in various devices and circuits.

11. CRYSTAL OSCILLATOR
 It is used to provide external clock.
 It provides stable frequency oscillations.

12. BUZZER
 It gives the BEEP sound according to the given time.

13. CIRCUIT IMPLEMENTATION

14. Hardware Design
 Soldering Part

16. EXECUTION
 Compiler/IDE (Integrated Development
Environment)
- Used Code Vision AVR (CVAVR)
 Programmer- Pony Prog: For dumping the program
into ATMEGA 8
 USB Programmer

17. WORKING
 On the power supply of the circuit the bridge circuit
converts the ac supply in to dc supply and voltage
regulator regulates the supply.
 We are using IC 7805 which will gives output as 5V This
voltage is used to display the LCD.

18.  On the LCD we can able to view time format as
HH:MM:SS and DAY Number.
 We programmed this project as to hear the Buzzer sound
every after one hour and we can display as per the
schedule in the program.

19. INITIAL DISPLAY

20. LECTURE 1

21. LUNCH BREAK

22. OFF TIME

23. FEATURES OF PROJECT
 Powered by +5v & +12v.
 Current consumption 0.45mA for microcontroller.
 We can hear Buzzer sound every after one hour.

24. ADVANTAGES
 This project can be used in educational institutes,
colleges, schools.
 This project can also be used in industries.
 It is an automatic system.
 Human errors can be avoided.
 Safety is assured

25. APPLICATIONS
 Colleges, Schools.
 Washing machine.
 Microwave ovens.
 Video recorders.
 Security system.
 Digital watches.

26. FUTURE SCOPE
 Automatic college bell system using Lab VIEW can be
extended for further development as there can be many
departments in a university at a distance in the same
campus and want to synchronize all department bells.

27. CONCLUSION
 Present day ringing the bell in colleges or schools are
carried out manually.
 The main disadvantage of this is that one person has to be
alert for this.
 To overcome from this, we have decided to prepare the
circuit which will be operated automatically and the
ringing of bell will start by its given time.

28. THANK YOU