Verifying presence and correct connection of 3 different voltages

Discussion in 'The Projects Forum' started by nickyoko21, Mar 16, 2010.

  1. nickyoko21

    Thread Starter New Member

    Mar 16, 2010
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    I am working on a project to take in 3 voltages through 3 wires. There are ONLY 3 connection points.
    1) I need to confirm the 3 wires are wired to the 3 connection points. Sometimes, 2 wires could be connected to 1 connection point. or 3 wires to 1 connection point.
    How can I use logic gates to design this?
     
  2. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    Not enuf detail on what you are planning.
    What are the voltage levels?
    what type of gates do you intend to use?
    Give a detail explanation of the circuit you want to built.
     
  3. retched

    AAC Fanatic!

    Dec 5, 2009
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    Is this a continuity tester or voltage tester? Do you want to be sure that there is a connection, or KNOW the voltages?
     
  4. nickyoko21

    Thread Starter New Member

    Mar 16, 2010
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    the 3 voltages I am using is 5V, 3V, 0V
    all of them must be connected to 3 i/o. if 1 of them is not connected, there should be an indication.
    I thinking of using AND gates to take in the signal but i am not sure how to verify the presence of the wire. Can it detect when no wire(either 5V, 3V, 0V) is connected to it?
     
  5. R!f@@

    AAC Fanatic!

    Apr 2, 2009
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    Why the 0V.
    Ground should always be connected to sense the other two.
    Which means you need only two Vsense.
     
  6. nickyoko21

    Thread Starter New Member

    Mar 16, 2010
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    Rf,

    Yes,u r rite... I can use 1V to simulate the input of 0V, as i need it as reference.




     
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