DTMF based home automation using mobile

Discussion in 'The Projects Forum' started by heer narayan chaudhary 1, Jul 17, 2017.

  1. heer narayan chaudhary 1

    Thread Starter New Member

    Jul 17, 2017
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    please provide me a circuit diagram
     
  2. absf

    Senior Member

    Dec 29, 2010
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  3. Heer Narayan Chaudhary

    New Member

    Jul 17, 2017
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    I have try this but it does not works
    any idea ?
     
  4. blocco a spirale

    AAC Fanatic!

    Jun 18, 2008
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    Maybe you wired it wrong.
     
  5. Heer Narayan Chaudhary

    New Member

    Jul 17, 2017
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    which wire mobile connector or circuit jumper
     
  6. AnalogKid

    AAC Fanatic!

    Aug 1, 2013
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    That's not quite how things work here. Please post *your* schematic and photos of *your* construction. Then we will have something to review, and we can make suggestions. The circuit in post #2 has some non-standard symbols, but basically is correct as shown. If it doesn't work for you then the problem is on your end.

    What does "does not work" mean? In what way does it not work?

    ak
     
  7. Heer Narayan Chaudhary

    New Member

    Jul 17, 2017
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    when we give supply to it then already leds glows which are connected at terminal 11 to 15.
     
  8. Heer Narayan Chaudhary

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    Jul 17, 2017
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  9. Heer Narayan Chaudhary

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    Jul 17, 2017
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  10. absf

    Senior Member

    Dec 29, 2010
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    Did you read the datasheet of MT8870? There is a table in the PDF that give you the conditions of the inputs that would cause Q1-Q4 to become "H".

    MT8870D tables.PNG
    The datasheet is attached....
     
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