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Sensor Forum Replace wall light switch with Touch Sensor
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Related

Replace wall light switch with Touch Sensor

Former Member
Former Member over 11 years ago

I am new at electronics -- so forgive possible stupid questions.

I am trying to replace a wall light switch with a touch sensor switch.

I intend to use a capacitive touch sensor with a relay switch.

The touch sensor will be DC voltage; the relay switch will be the AC voltage.

How can I use the AC voltage in the wall switch to power the DC voltage for the touch sensor?

In the alternative, is there an AC voltage touch sensor I should use instead?

Finally, is there a completely different alternative method I should use?

Thank you for your input!

Richard

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  • dougw
    0 dougw over 11 years ago

    Hi Richard,

    Here are a couple of standard circuits to make a touch sensitive ligh switch...

     

    image

    image

     

    Doug

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  • dougw
    0 dougw over 11 years ago

    Hi Richard,

    Here are a couple of standard circuits to make a touch sensitive ligh switch...

     

    image

    image

     

    Doug

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  • Former Member
    0 Former Member over 11 years ago in reply to dougw

    Doug,

    Thanks for the circuits!

    I appreciate the circuits; I have been trying to figure out how to get started.

    I have not, yet, analized your circuits; though, it appears that they are using 220V.  Here in America, we use the 120V; I presume I would just need to make some applicable adjustments -- is that correct?

    This is great!

    Thanks.

    Richard

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  • dougw
    0 dougw over 11 years ago in reply to Former Member

    Hi Richard,

    The circuits should work as is with either 220 or 115 vac. The 15V zener limits the voltage to the chip in either case.

    You can find a datasheet here:

    http://www.farnell.com/datasheets/57961.pdf

    Doug

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