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8051 Automatic college/school bell timer 1.0

Timer circuit to Ring the bell for school or college.

  1. Binu
    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.

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    Circuit Diagram
    college bell.jpg
    Operating procedure:
    • 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
    udomsak 228, saso, santanu123 and 4 others like this.

Recent Reviews

  1. sekhar007
    sekhar007
    3/5,
    Version: 1.0
    sir plz reply me this circuit and code doesn't work in proteus 8.0 version pls reply me sollution
  2. mahesh j shetty
    mahesh j shetty
    4/5,
    Version: 1.0
    Its good project
  3. Djoko
    Djoko
    5/5,
    Version: 1.0
    goo jobs
  4. santanu123
    santanu123
    5/5,
    Version: 1.0
    SIR PLS SEND ME THE PCB COMPONENT LAYOUT AND PCB LAYOUT OF 89C52 BASED AUTOMATIC COLLEGE BELL USING BC548 INSTEAD OF UNL2003
  5. karthickece
    karthickece
    5/5,
    Version: 1.0
    This project was sucessfully completed....... thnk u
    hair soft to u