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8051 Automatic college/school bell timer 1.0

Timer circuit to Ring the bell for school or college.

  1. naseef

    naseef New Member

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    Sir
    Online assembler show a error
    "segment limit exceeded"
  2. naseef

    naseef New Member

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    sir

    which assembler is used to assemble this program.?
  3. Binu

    Binu Administrator

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  4. Svetoslav

    Svetoslav New Member

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    Hello , I test the code for school bell , but ring is only 25 - this is a standard ring , but I want two rings ( different times , with a break for teacher came to class ) and added to ( 0 -60sec.) they 25 '' ( 27-40 ) , can halp for this source code.
    Š¢hanks in advance!
  5. Binu

    Binu Administrator

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    Then you need to change the code for it.
  6. Svetoslav

    Svetoslav New Member

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    to but do not know how this will happen,
    Is there anyone who can do?
    Last edited: Mar 27, 2015
  7. rst

    rst New Member

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    sir, please provide reference to realise and understand the 8051 programing. give me some steps to make me perfect on it
  8. adi suyahman nainggolan

    adi suyahman nainggolan New Member

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    sir, I want the old relay contacts can be in the settings on each clock settings,
    eg 1 hour relay kkontak 3 seconds, at 2 relay contacts 1 second, 3-hour relay contacts 3 seconds, and so on.
    how the code themselves?
    thank you
  9. Sushant B Kudagi

    Sushant B Kudagi New Member

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    Sir, I am not able to get the output. LCD fires up but shows no output. Simulation also returns no output. Please help
  10. santanu123

    santanu123 New Member

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    SIR PLS SEND ME THE PCB COMPONENT LAYOUT AND PCB LAYOUT OF 89C52 BASED AUTOMATIC COLLEGE BELL USING BC548 INSTEAD OF UNL2003
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