external oscillation

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  1. - 11th October 2006, 04:48 #1
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    Quote Originally Posted by lerameur
    ... maybe the square waves (although noisy) can scare them off.
    k

    Make sure it won't attract the big insects if not small birds!
    "If the Earth were a single state, Istanbul would be its capital." Napoleon Bonaparte
  2. - 11th October 2006, 04:58 #2
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    Default It's not just for birds anymore . . .

    Hi lerameur,
    I need one of those too, to repel pidgeons, and neighbors with BIG STEREOS!
    About 300 watts ought to do it! Someone on eBay is already selling PICs programmed to do this and he sells tranducers too!
    Good luck with the birds, let us know how it works.
    Joe
  3. - 11th October 2006, 06:16 #3
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    Some DDS synth may do the job.

    some DACs to control some VCOs too.

    Tons of different way. A single PIC.. maybe good for low frequency.

    Do you have all frequency values? It could be possible with some effort...

    EDIT: you said 6 frequency... All together or what?

    Be carefull some birds are much intelligent than others...
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    Last edited by mister_e; - 11th October 2006 at 06:22.
    Steve

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  4. - 11th October 2006, 14:26 #4
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    well I thought this thing could be battery operated, at 300watt forget that..

    here is the code I would like to use:
    Also, one freqnecy the output looks good, but more then one the frequency varies from 11k to 31khz and very unstable.

    @ DEVICE HS_OSC
    TRISB = 0

    loop: FREQOUT PORTB.1,10000,20000
    ' Pause 100 ' Delay for .5 seconds

    FREQOUT PORTB.1,10000,26000 ' Turn on PORTB for 1- sec at 26Khz
    Pause 100 ' Delay for .5 seconds

    FREQOUT PORTB.1,10000,21000 ' Turn on PORTB for 1- sec at 21Khz
    Pause 100 ' Delay for .5 seconds

    FREQOUT PORTB.1,10000,27000
    Pause 100

    FREQOUT PORTB.1,10000,22000
    Pause 100

    FREQOUT PORTB.1,10000,28000
    Pause 100

    FREQOUT PORTB.1,10000,23000
    Pause 100

    FREQOUT PORTB.1,10000,29000
    Pause 100

    Goto loop ' Go back to loop
  5. - 11th October 2006, 15:21 #5
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    Talking

    A look here ???

    http://shop.elv.de/output/controller...&detail2=10617

    ...

    no comment !!!
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    Why insist on using 32 Bits when you're not even able to deal with the first 8 ones ??? ehhhhhh ...
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    IF there is the word "Problem" in your question ...
    certainly the answer is " RTFM " or " RTFDataSheet " !!!
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  6. - 11th October 2006, 16:05 #6
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    Depending your osc frequency (wich you should define at the top of your code) this shoud produce the freq sweep from 11 to 41KHz
    Code:
    Freq var Byte
Duration var Word

Start:
    For Freq=45 to 16 step -1
        For duration = 0 to 10000
            High PORTB.1
            PAUSEUS Freq
            LOW PORTB.1
            PAUSEUS Freq
           NEXT
         NEXT
    GOTO Start
    Last edited by mister_e; - 11th October 2006 at 16:10.
    Steve

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    There's no problem, only learning opportunities.
  7. - 14th October 2006, 01:49 #7
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    hello Steve,

    tu dois parler francais ?
    J,ai regardé ton site l'autre jour
    moi je suis de ste-julie.
    le monde est petit

    ken
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