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8051 Automatic college/school bell timer 1.0

Timer circuit to Ring the bell for school or college.

  1. adi suyahman nainggolan

    adi suyahman nainggolan New Member

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    advice,
    active long relay can be set according to schedule many are in store,
    For example: schedule 1 relay longer active 3 seconds, schedule 2 active relay 5 seconds long, long active 3 relay schedule 8 seconds, and so on.
    Thank you.
  2. r.sivakumar

    r.sivakumar New Member

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    sir i am from erode district gobichettipalayam i am electronic hobbyist i contruct the school bell timer as the intruction given by u but display firesup and no data displayed in lcd , i check the circuit and i flash the mcu again and again but i get the same result pls help me my mail id r.siva79@rediffmail.com
  3. Binu

    Binu Administrator

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    Check the connections in between the mcu and display. Also the pin 5 of lcd should be connected to ground.
  4. r.sivakumar

    r.sivakumar New Member

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    thank u for ur reply sir, i am impressed to ur reply, i check yr suggestion
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