door bell , detect activation


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  1. #1
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    Default door bell , detect activation

    Hello all

    here I come with my very low skills in electronics, to learn stuff that my brain can't compute

    I have installed a doorbell downstair, but it doesnt ring loud enought. So I taugh I would make a clever doorbell chime/lights with a PIC brain for upstair, as I don't really wan't to hear a loud thing all the time.

    So I extended a wire upstair, thinking I could tap into to signal serially just adding a resistor(it's 12v). uhhh.

    http://www.picbasic.co.uk/forum/atta...1&d=1201800699

    But then I realized I would never get anything from that setup, unless I would tap into the line serially with a relays.

    So I wonder know, is there a *simple*, electronic way(else than a relay) to get a 5v signal from that setup??
    Some kind of ghost current detection?

    thanks to the knowedgeables!

    Dom
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  2. #2
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    Quote Originally Posted by flipper_md View Post
    Hello all
    here I come with my very low skills in electronics, to learn stuff that my brain can't compute
    I have installed a doorbell downstair, but it doesnt ring loud enought. So I taugh I would make a clever doorbell chime/lights with a PIC brain for upstair, as I don't really wan't to hear a loud thing all the time.
    So I extended a wire upstair, thinking I could tap into to signal serially just adding a resistor(it's 12v). uhhh.
    http://www.picbasic.co.uk/forum/atta...1&d=1201800699
    But then I realized I would never get anything from that setup, unless I would tap into the line serially with a relays.
    So I wonder know, is there a *simple*, electronic way(else than a relay) to get a 5v signal from that setup??
    Some kind of ghost current detection?
    thanks to the knowedgeables!
    Dom
    Wireless doorbell from Walmart or something... $10, runs for a couple of years off 2 AA's, range of a 100 feet or so. Mine was a bit loud, muffled it with duct tape internally (after all, what CAN'T duct tape do). And it has an on/off switch when I just don't want to listen to it.
    Now THAT is simple.

  3. #3
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    Quote Originally Posted by skimask View Post
    Wireless doorbell from Walmart or something... $10, runs for a couple of years off 2 AA's, range of a 100 feet or so. Mine was a bit loud, muffled it with duct tape internally (after all, what CAN'T duct tape do). And it has an on/off switch when I just don't want to listen to it.
    Now THAT is simple.
    But if you want to learn electronics, try a voltage divider.
    http://www.pbpgroup.com/modules/wfse...p?articleid=25
    Dave
    Always wear safety glasses while programming.

  4. #4
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    Hi,

    Try that.


    (Click to enlarge the picture)

    Optocoupler Datasheet:
    http://www.vishay.com/docs/83675/sfh620.pdf

    Best regards,

    Luciano
    Last edited by Luciano; - 31st January 2008 at 20:24.

  5. #5
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    Great,

    I'll see what I can do with opto or voltage divider(Once I grab components to try)


    and skimask, it's just a personnal choice but my life rule is away from wireless




    thanks guys for ur time!


    Dom

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    Quote Originally Posted by flipper_md View Post
    and skimask, it's just a personnal choice but my life rule is away from wireless
    Dom
    Don't get me wrong...I'm all about over-designing, over-engineering something, anything But some things...a guy just has to go out and buy...

  7. #7
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    Hi flipper_md,
    Here is a trick I learned here, cheap, simple, in a word elegant: use an LM78L05 regulator.
    the input goes to your 12v+ wire ground to 12v - and output is your 5V +. It is a TO92 case device, perfect as an input reducer for a PIC . Must rectify to use,not for A/C
    Last edited by Archangel; - 1st February 2008 at 05:05.
    If you do not believe in MAGIC, Consider how currency has value simply by printing it, and is then traded for real assets.
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    Quote Originally Posted by skimask View Post
    (after all, what CAN'T duct tape do).
    I read somewhere that almost all problems can be fixed by either duct tape or a helping of WD40. Now if things were really that simple.....

    JF

  9. #9
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    Quote Originally Posted by Jerson View Post
    I read somewhere that almost all problems can be fixed by either duct tape or a helping of WD40. Now if things were really that simple.....

    JF
    Of course it's not always that simple...You forgot the 48oz drill hammer!

  10. #10
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    AHah

    i'm a big fan of duct tape too. Two in the car, one in the trailer, one in the house...just so handy and easy to understand


    Hey Joe S, I'll give a try to your idea, but actually I'd like to be able to tap in the signal like a spy, not having access to the ground signal.
    Rectifying the current sound interresting doh! If I tap 2 diodes to the thing, maybe I can get some DC current trace thru a wire??


    I'm really not a big fan of AC =)

  11. #11
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    Quote Originally Posted by flipper_md View Post
    AHah



    I'm really not a big fan of AC =)
    Yeah, neither was Edison . . .
    If you do not believe in MAGIC, Consider how currency has value simply by printing it, and is then traded for real assets.
    .
    Gold is the money of kings, silver is the money of gentlemen, barter is the money of peasants - but debt is the money of slaves
    .
    There simply is no "Happy Spam" If you do it you will disappear from this forum.

  12. #12
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    Originally Posted by flipper_md
    I'm really not a big fan of AC =)
    Quote Originally Posted by Joe S. View Post
    Yeah, neither was Edison . . .
    Please don't kill an elephant.
    http://en.wikipedia.org/wiki/Topsy_(elephant)

    Best regards,

    Luciano

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