Automatic School Timer This Automatic school and collage timer for automatic bell purpose  We can schedule Monday, Tuesday, Wednesday etc like day wise different timing programmable.  Bell duration programmable in second.  Built in real time clock, if switch or unit for 30days time never changes.  Once we programme it will there until we change.  Easy to programme. This can be used as a time programmable switch can be connected to motors, Fans, lights also but for that different timer available.

1. Corporate Services
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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
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