voltage sense monitoring

Discussion in 'Embedded Systems and Microcontrollers' started by badjaw, Nov 26, 2011.

  1. badjaw

    Thread Starter New Member

    Nov 26, 2011
    1
    0
    please help!i need voltage monitoring circuit when i plug 110vac my first contactor will react and the contactor wont anf if i plug 220 vac power input the other contactor wont react and the previous one now react anyone have a circuit i need it badly for our project
     
  2. SPQR

    Member

    Nov 4, 2011
    379
    48
    Hello and welcome.

    I think this is a great question for a newbie like myself (I might be able to use it in the future).

    I found THIS .pdf that described voltage sensing with transistors and Zeners, and it seems to be a great theoretical paper.

    I'm guessing that you're looking for a circuit that gives +5V for 220 and OV for 110 right?
    Then that info would be passed to a controller?

    But let's wait for the experts.
     
  3. SPQR

    Member

    Nov 4, 2011
    379
    48
    I found another possibility that might work for you HERE.
     
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