Question on Wireless Switch

Discussion in 'General Electronics Chat' started by bhaazee, May 13, 2012.

  1. bhaazee

    Thread Starter New Member

    Mar 3, 2012
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    Assuming that a light bulb is connected to an AC power source through a simple electrical switch, its easy to understand how the circuit works.

    But now, I "also" want to control the switching activity wirelessly (via IR or Internet or BT, etc.). This means, the same light bulb should be able to be controlled either through a mechanical switch or through some electronic circuit.
    How can this be made? (Although the light bulb in this case, will be controlled via two switches I believe the way both the switches are connected is not like a two way switch). I believe this is the way, how an home automation system works.

    I just want to understand the working logic behind. Hence I have put forth my query.

    Regards
     
  2. MrChips

    Moderator

    Oct 2, 2009
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    6,149
    So you have an electronic controller to control a light.

    The light can be operated from two locations.

    Draw the boolean logic table for this function.
    You have two inputs, one we label A and the second we label B.
    You have a single output we can label X.
    Fill in the values of the table for X for all possible conditions of A and B.

    If you are not familiar with boolean logic you can read up on this in the AAC Tutorials:

    http://www.allaboutcircuits.com/vol_4/chpt_7/1.html

    What you are looking for is called an Exclusive OR function or gate.
     
  3. bhaazee

    Thread Starter New Member

    Mar 3, 2012
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    remembering my basics which I studied during bachelors

    If possible could you illustrate me with some hardware example. Simply put, I was speaking about a two way switch. But I am asking if there is any electronic device (say some kind of transistor or MOSFET kind of electronic device) that performs the operation of a two way switch.

    and thanks for the reply.
     
    Last edited: May 13, 2012
  4. MrChips

    Moderator

    Oct 2, 2009
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    The answer is in post #2.

    I am referring to a two-way switch.

    The solution is called an Exclusive OR gate.
     
  5. bhaazee

    Thread Starter New Member

    Mar 3, 2012
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    Sorry. Have only learnt about logic gates. Haven't really seen such physical gates. Hence could not grasp your point.

    Thanks again
     
  6. Bernard

    Expert

    Aug 7, 2008
    5,227
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    Might consider a common receiver feeding a toggle flip-flop which controls the light. One push of either transmitter, & light goes on- second push light goes off.
     
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