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Audio to PWM? — Parallax Forums

Audio to PWM?

ArchiverArchiver Posts: 46,084
edited 2002-03-06 05:40 in General Discussion
HELP!

I have had no luck finding the info I need.

I need to convert audio output from my sound source to control a servo.

In other words....

The louder the sound the longer the servo movement.

any suggestions...

please remember I am not an EE.

Thanks.

Rus

Comments

  • ArchiverArchiver Posts: 46,084
    edited 2002-03-01 15:14
    Hi Rus,

    Check out the Visual Servo Automation product from Brookshire Software
    www.brookshiresoftware.com

    Hope this helps,

    Rich



    Original Message
    From: Rus Hardy [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=F4FTutS_kEOtQff0nF5ahOMOCgEQmCoYX7XRalLfUAqRQPz8aNLVN90Igj14KelFve2hPtJ4mcFj0pmeQ67E5H_H]rushardy@m...[/url
    Sent: Friday, March 01, 2002 9:02 AM
    To: basicstamps@yahoogroups.com
    Subject: [noparse][[/noparse]basicstamps] Audio to PWM?

    HELP!

    I have had no luck finding the info I need.

    I need to convert audio output from my sound source to control a servo.

    In other words....

    The louder the sound the longer the servo movement.

    any suggestions...

    please remember I am not an EE.

    Thanks.

    Rus



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  • ArchiverArchiver Posts: 46,084
    edited 2002-03-06 05:40
    Actually, I've done something similar before in my first project ever
    with micros. It involved a 'robot' head on a motor gearing which
    turned in the direction of the loudest noise. I used a PIC, and even
    had it connected to a PC for programming in routines through a VB
    interface (it did more than just turn).

    But to capture and hold the short noise, I used an op-amp in a sample
    and hold configuration. The 'mic' charges up a cap, and the op-amp
    slowly bleeds it off. The difference in level between the left-ear
    and right-ear would be cause it to turn in one direction or the other.

    I believe there is a sample and hold circuit in the Stamp manual (old
    one) for PWM output that may be modified. Also, we discuss sample
    and hold in the Industrial Text.

    Martin Hebel
    Need a GUI for your Stamp?
    http://www.selmaware.com/stampplot


    >
    >
    Original Message
    > From: Rus Hardy [noparse][[/noparse]mailto:rushardy@m...]
    > Sent: Friday, March 01, 2002 9:02 AM
    > To: basicstamps@y...
    > Subject: [noparse][[/noparse]basicstamps] Audio to PWM?
    >
    > HELP!
    >
    > I have had no luck finding the info I need.
    >
    > I need to convert audio output from my sound source to control a
    servo.
    >
    > In other words....
    >
    > The louder the sound the longer the servo movement.
    >
    > any suggestions...
    >
    > please remember I am not an EE.
    >
    > Thanks.
    >
    > Rus
    >
    >
    >
    > To UNSUBSCRIBE, just send mail to:
    > basicstamps-unsubscribe@y...
    > from the same email address that you subscribed. Text in the
    Subject
    > and Body of the message will be ignored.
    >
    >
    > Your use of Yahoo! Groups is subject to
    > http://docs.yahoo.com/info/terms/
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