David Duffy wrote:
>
> I have a customer who needs to scare birds (Starlings) away
> from inside a shed area so that they don't nest in there and
> damage large machinery being stored. My first thought was
> to us a PIC to generate tones that the birds don't like played
> at semi-random intervals. Does anyone have any experience
> with this type of thing? The shed is not sealed (not possible
> to do easily) so just shutting them out is not an option.


Maybe try a high power ultrasonic system, I
believe that birds in general have excellent and
quite sensitive hearing in the >20kHz range.

Some cheap 100W hifi piezos spread around and a
nasty high-power (300W??) squarewave driver, changing
notes randomly and with random timing but all
ultrasonic. You should be able to get it so irritating
that no bird will stay in there very long. In an open
field you might not get the pressure levels and need
predator calls, but inside a factory shed I think
you can get the pain levels right up there for
the little darlings. ;o)

The piezos are also fairly directional at those
freqs so you should be able to keep most of the
sound power up high in the shed too.
-Roman

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