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Converting a push button switch to at motion Sensor

Discussion in 'Electronic Basics' started by Bgranier, Jul 2, 2004.

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  1. Bgranier

    Bgranier Guest

    I have a push button switch and all I want to do is put in a motion
    sensor switch to complete the circuit so that it will send the signal.

    I just need to know what kind of switch to buy.

    thank you
    bgranier
     
  2. That's not clear. What sort of 'signal' does your circuit send? Where
    does it come from? Where does it send it? And do you mean you want to
    send this signal when you EITHER press your button OR the motion
    sensor detects a signal (also allowing for BOTH states, of course)?
     
  3. CFoley1064

    CFoley1064 Guest

    Subject: Converting a push button switch to at motion Sensor
    Not a whole lot of information here to work with.

    One place to start might be the normally closed and normally open magnetic door
    switches available from Radio Shack or other hobbyist sources. The half where
    you connect the wires has either a normally open (Cat # 49-533, $4.97 USD) or
    normally closed (Cat # 49-532, $5.99 USD) reed switch, which is activated by a
    magnet in proximity. That will give you a switch indication if something
    moves. It also has the advantage of not requiring an additional power source,
    and can be connected directly into your electrical circuit without getting into
    the details of how the circuit works.

    http://www.radioshack.com/

    Need a better answer, provide more info about your problem.

    Good luck
    Chris
     
  4. You just need to tell us a few more things.

    What are the characteristics of the switch you intend to
    replace (membrane/resistive/SPST/snap-action/other?)
    Voltage, current capacity)?

    What kind of motion are you sensing? What's moving, how
    far, and how fast? Does the switch have to detect a change
    quickly (how quickly), then "reset" quickly for the next
    event? Does it have to do so repetitively (as in sensing
    rotation), and what're the chances it will have a mechanical
    resonance near that repetition rate? Can the circuit handle
    input changes at the likely rep rate?

    Does the switch need to physically contact the moving
    object to detect it? How much mechanical force does the
    switch have to cope with from the moving object?

    If not, what property of the object changes as it passes
    by (brightness, color, magnetic properties, etc)? How
    quickly does it change: is the circuit the switch is part of
    capable of debouncing the new switch's action? Does it need
    to? Is there an adequately sharp transition in the sensed
    property as the object passes from "I don't care where it
    is" to "I need to know when it's _here_" and back?

    Will you need to mount the switch remotely from the
    original circuit? Will the fact that you have to use wires
    to connect it screw up timing etc?

    What's the environment (electrical, chemical, etc) the
    new switch will have to operate in? Will you have to shield
    or otherwise protect the switch and wires?

    Mark L. Fergerson
     
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