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Disarm Button for AC Bell Buzzer

Former Member

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What is the proper approach for adding a disarm button to this circuit, so that the buzzer doesn't sound until the next time the button is released?

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  • If the disarm button is pressed and held before and at least until the door is open in the following circuit, the disarm will remain as intended until the next time the door is opened. Some kind of RFID badge reader may be able to produce the intended results (exiting the door could be done with a button but I'd rather not have one outside due to weather, curious visitors, etc) at which time no delay mechanism would be needed. I will investigate.

     

    image

    EDIT: Or a far less expensive magnetic reed switch image I can just put a magnet on the master key rings housekeepers use.

  • in reply to Former Member

    Hi Simon,

    I forgot about the circuit I put together for you last November. Did you ever implement it? Note in your schematic that you will not be able to integrate the latching relay idea into the schematic from last year. You can't latch the relay by tying it to the output of the NE555. If you are in fact using the NE555 circuit we may be able to cancel the buzzer by resetting the NE555 and skip the new relay. If I remember correctly the circuit made it so the buzzer would only sound for a short period of time. If there is going to be a delay you will have to put its circuitry ahead of the NE555 timer. In other words the door switch triggers a delay timer which after 5 seconds triggers the NE555 circuit which dispenses a short buzz. If the reset button is pushed at any time both timers are reset to start and the door must be shut and reopened to trigger the process again.

    John

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  • in reply to Former Member

    Hi Simon,

    I forgot about the circuit I put together for you last November. Did you ever implement it? Note in your schematic that you will not be able to integrate the latching relay idea into the schematic from last year. You can't latch the relay by tying it to the output of the NE555. If you are in fact using the NE555 circuit we may be able to cancel the buzzer by resetting the NE555 and skip the new relay. If I remember correctly the circuit made it so the buzzer would only sound for a short period of time. If there is going to be a delay you will have to put its circuitry ahead of the NE555 timer. In other words the door switch triggers a delay timer which after 5 seconds triggers the NE555 circuit which dispenses a short buzz. If the reset button is pushed at any time both timers are reset to start and the door must be shut and reopened to trigger the process again.

    John

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