This is the new version of this project. This new project uses AT89S52 microcontroller and I2C EEPROM to store the alarm timings. Also the 7segment display is replaced with LCD display. The user can store upto 25 bell timings and they can even set the time delay for bell ringing in seconds. An 4x3 keypad is used to enter the real time clock and the bell timings. ULN2003 is used to drive the relay for the bell. DS1307 is used for Real time clock.
- Dial *0 to Change Real Time
- Dial *01 to change first Bell Timings
- Dial *02 to change second Bell Timings
- Dial *25 to change 25th Bell Timings
- Dial *26 to change the Time delay in seconds
8051 Automatic college/school bell timer 1.0
Timer circuit to Ring the bell for school or college.