/*---------------------------------------------------------------------------- S.M.E.L.T. : Small Musically Expressive Laptop Toolkit Copyright (c) 2007 Rebecca Fiebrink and Ge Wang. All rights reserved. http://smelt.cs.princeton.edu/ http://soundlab.cs.princeton.edu/ This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 U.S.A. -----------------------------------------------------------------------------*/ //----------------------------------------------------------------------------- // name: smack-sense.ck // desc: Sudden Motion Sensor (SMS)-based smack detector // // authors: Rebecca Fiebrink and Ge Wang // // requires: SMS-enabled powerbook or macbook running OS X (10.4.8 or higher) // // to run (in command line chuck): // %> chuck smack-sense.ck // (note: works best when started with laptop on stationary hard surface) // // to run (in miniAudicle): // (make sure VM is started, add the thing) //----------------------------------------------------------------------------- // smack detection threshold (less -> more sensitive) 15 => int threshold; // pol rate .01::second => dur poll_rate; // recover time (after smack detection) .10::second => dur recover_time; // instantiate a HidIn object HidIn hi; HidMsg msg; // open tilt sensor if( !hi.openTiltSensor() ) { <<< "tilt sensor unavailable", "" >>>; me.exit(); } // "go" <<< "smack me!", "" >>>; // prev HidMsg last; // initialize reference hi.read( 9, 0, last ); // infinite event loop while( true ) { // poll the tilt sensor, expect to get back 3 element array of ints hi.read( 9, 0, msg ); // compute difference (Math.abs(msg.x - last.x) + Math.abs(msg.y - last.y) + Math.abs(msg.z - last.z)) => int diff; // check threshold if (diff > threshold) { // smack detected! <<< "Ouch!", now/second >>>; recover_time => now; } else { // uncomment the following to dynamically calibrate the smack sensor // msg.x => last.x; // msg.y => last.y; // msg.z => last.z; poll_rate => now; } }