simple sound detection(something like a clap of a whistle)

[harshvardhan]

hi,

i am trying to program a car, that will stop if i whisle to it.


is it possible to detect a whistle without using something complex like bitvoicer or easy VR?

something like understanding what a whistle wave looks like, and then comparing?

the input will obviously be thorugh an ordinary mic.

[robtillaart]

Ever visited the arduino tutorial pages?

Check - http://arduino.cc/en/Tutorial/Knock - !

[harshvardhan]

but wont i have to be whistling REALLY hard to get this working?

[robtillaart]

Never tried this sketch with a whistle.
AN alternative is to use a microphone like his one - https://www.sparkfun.com/products/9964 -

[harshvardhan]

but what logic to use to distinguish between sounds?

[robtillaart]

Fourier transform  or  FFT, it splits the signal into its building frequencies

Google for Arduino and FFT to find some implementations

[Grumpy_Mike]

Or you can use a notch filter on the input.
There are also tone detecting chips that give a digital output.