May 6, 2009

Acoustic Gesture Recognition
Complex Hacks

1

  This Acoustic Gesture Recognition by Gary Halajian and John Wang from the Cornell University Designing with Microcontrollers course reminds me of the Object Scratching Input Device that Chris Harrison made (I later read the references and see that sure enough they reference the Object Scratching Input Device Project).  "Our project utilizes a microphone placed in a stethoscope to recognize various gestures when a fingernail is dragged over a surface.

Piezoelectric Amplifier Circuit
Electronic Hacks

4

  Piezo buzzers can be found everywhere, next time you throw out an old smoke detector be sure to remove the piezoelectric element from it and stash it in your parts bin. If you want to monitor sound with a piezoelectric element it’s not that easy since the voltage produced by the device is so small. Nerd Kits has not only provided a circuit to help out they also walk