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110VAC On/Off to 5VDC signal

Discussion in 'General Electronics Discussion' started by btaz, Jan 20, 2015.

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  1. btaz


    Sep 28, 2012
    Any suggestions for an easy circuit that can tell me if 110VAC is on or off by providing a 5V(on) and 0V(off) signal? I don't need this to be a power source only a telemetry signal that will interface with an arduino digital input. So far the easiest thing I can think of is to just use an old wall wart to do the conversion, but if there is a simple circuit I could create then I'd prefer that. Thanks for the suggestions.
  2. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

    Nov 28, 2011
  3. Arouse1973

    Arouse1973 Adam

    Dec 18, 2013
    What about a simple 110- 5 Volt wall wart? Just for signalling purposes. They are quite cheap and should be relatively safe.
  4. Jouellet


    Feb 2, 2015
    Check on the Microchip web site (

    A while ago, I found an application note, to detect zero-crossing for generating X-10. By memory, they were simply using a 1 Meg resistor to drive an input... Check on their site to be sure.

    I remember back then that I was surprised on how easy it was !!!
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