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Circuit Which Turn On The Light As A Response To A Specific Sound Sequence ?

Discussion in 'LEDs and Optoelectronics' started by akshay797, Jan 30, 2017.

  1. akshay797

    akshay797

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    Jan 30, 2017
    I want to make a simple circuit which turns on the light when hearing a specific sound sequence .. for example : a beep sound -second gap-another beep sound .

    please suggst a simple circuit with out the help of voice recognitio
     
  2. CDRIVE

    CDRIVE Hauling 10' pipe on a Trek Shift3

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    May 8, 2012
    Welcome to EP. The most practical approach would be a microcontroller.

    Chris
     
  3. akshay797

    akshay797

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    Jan 30, 2017
    thanks for the response .. can u be more specific about the micro controller and whole setup ? i just want the circuit to respond to the sound sequence which is based on a time-gap?
     
  4. KMoffett

    KMoffett

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    Jan 21, 2009
    What sounds?

    Ken
     
  5. akshay797

    akshay797

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    Jan 30, 2017
    circuit which turns on the light when hearing a specific sound sequence .. for example : a beep sound -second gap-another beep sound
     
  6. CDRIVE

    CDRIVE Hauling 10' pipe on a Trek Shift3

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    May 8, 2012
    What's going to generate the beep sound?

    Chris
     
  7. BobK

    BobK

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    Jan 5, 2010
    The difficulty of this project will depend a lot on the loudness of the triggering sound vs the ambient noise. It could be as simple as a bandpass filter, peak detector and a little bit of logic, or as complicated as a DSP (digital signal processor) doing an FFT (fast Fourier transform) to analyze the sound.

    Bob
     
    akshay797 likes this.
  8. akshay797

    akshay797

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    Jan 30, 2017

    hey ... This is my whole project .. I am making a plug point with a small circuit , An app in the smartphone produce sound like i mentions above .. so when hearing the sound the circuit should respond ... the loudness of the sound is normal audio level of a smart phone speakers .. also the chances for additional background noises are less .. so a solution ???
     
  9. KMoffett

    KMoffett

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    Jan 21, 2009
    Is the beep a fixed frequency tone, or more like a buzzer with lots of harmonics?

    Ken
     
  10. akshay797

    akshay797

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    Jan 30, 2017
    i can mak
    I can make any kind of tune which is possible by a smartphone
     
  11. BobK

    BobK

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    Jan 5, 2010
    How far away is the phone?
     
  12. FuZZ1L0G1C

    FuZZ1L0G1C

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    Mar 25, 2014
    Similar circuits mostly use a condensor mic / preamp filtered by active feedback-loop type notch or narrow-bandpass filters, some with frequency band-pass tuning.
    The key-finder keyring-fob is probably the audio-sensor part of what you need.
    Except these use a monolithic I.C. covered by a black blob of epoxy - not traceable.
    Drives an oscillator to return a 'beep' to a human whistle and most other KHz frequencies).
    The commercial "hand-clap" switches work on the timing principle you need.
    If you clap once, nothing happens. Clap twice within about 0.5 sec, and the circuit activates a relay.
    I opened mine to see "what makes it tick".
    My hand-drawn traced circuit unfortunately got damaged / discarded, but remember it used a c/mic then 741 op-amp as part of filter, to various logic IC's (forgot which since then). Switch now buried in storage..
    A hand-clap is white/pink noise analyzed at fpeaks about 11.5-13 KHz.
    Your CCT will likely fall into the lower audio range of about 500 - 5 KHz (My smartphone's peak is 2.2 KHz).
    I'll dive into my old magazine-storage boxes, as I plan a very similar project to wirelessly extend top-loader 2-tone beep* from bathroom to lounge via mini FM tx. Then a relay / S.C.R / Triac for small lounge-mounted lamp.
    *(Pre-rinse pause, waits for fabric-softener, beeping, then after 'X' seconds idle, continues "softener-less").
    W/M alarm-tone beeps about** 1875 Hz, 2342 Hz, pause, repeat.
    **From memory recall.
     
  13. Audioguru

    Audioguru

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    Sep 24, 2016
    I think your beep, beep detector will also detect my dog (bark, bark) and my wife (DINner's REAdy).
    My daughter bought a keys finder and hand-clap switch that activated so often that their batteries lasted only for a few days.
     
    FuZZ1L0G1C likes this.
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