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80FFTs Per Second To Detect Whistles (and Switch On Lights)

Posted by timothy on from the this-is-awesome dept.

New submitter Mathieu Stephan writes "Hello everyone! Some people told me that my latest project might interest you. I'm not sure you publish this kind of projects, but here it goes. Basically, it is a small platform that recognizes whistles in order to switch on/off appliances. It will be obviously more useful for lighting applications: just walk in a room, whistle, and everything comes on. The project is open hardware, and all the details are published on my website." The linked video is worth watching for the hidden-camera footage alone: it would be hard to not keep playing with this sensor.

4 of 156 comments (clear)

  1. I remember seeing a whistle device... by ls671 · · Score: 4, Interesting

    I remember seeing a whistle device that you attach to your key ring. When you lose your keys, you whistle and your key ring beeps.

    https://www.amazon.co.uk/Tobar-Keyfinder-Keyring-Whistle-Activated/dp/B000246JIQ

    --
    Everything I write is lies, read between the lines.
  2. Kids These Days... by lobiusmoop · · Score: 3, Interesting

    They've got so much cheap compact compute horsepower to play with, it's almost obscene. 2048-wide FFT? In my day you would be overjoyed with a simple time-domain autocorrelation pitch detector.

    (Lawn, etc...)

    --
    "I bless every day that I continue to live, for every day is pure profit."
    1. Re:Kids These Days... by jmv · · Score: 4, Interesting

      Actually, an FFT is often cheaper than autocorrelation because it's N*log(N) whereas auto-correlation is N^2. In any case, it's insanely cheap on today's machines.

      --
      Opus: the Swiss army knife of audio codec
  3. Re:as popular as the clapper! by Nutria · · Score: 3, Interesting

    Back in the 70s (when The Clapper first came out), we had a similar contraption that was basically a plastic whistle stuck to a hollow rubber ball. Squeeze the ball, the whistle whistles and the lamp turns on.

    As a teenager I enjoyed it, but I'm sure the adults thought it got old really quickly.

    --
    "I don't know, therefore Aliens" Wafflebox1