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ldt0028: Added support for LDT0-028 PZT film-based sensors

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Signed-off-by: Sarah Knepper <sarah.knepper@intel.com>
Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>
This commit is contained in:
sknepper
2014-11-18 14:38:36 -08:00
committed by Brendan Le Foll
parent 931c8e8814
commit c5369315e9
9 changed files with 388 additions and 0 deletions
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examples/javascript/ldt0028.js Normal file
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/*
* Author: Sarah Knepper <sarah.knepper@intel.com>
* Copyright (c) 2014 Intel Corporation.
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
// Load Grove module
var sensorModule = require('jsupm_ldt0028');
var NUMBER_OF_SECONDS = 10;
var MILLISECONDS_PER_SECOND = 1000;
var SAMPLES_PER_SECOND = 50;
var THRESHOLD = 100;
// Create the LDT0-028 Piezo Vibration Sensor object using AIO pin 0
var sensor = new sensorModule.LDT0028(0);
// Read the signal every 20 milliseconds for 10 seconds
console.log("For the next " + NUMBER_OF_SECONDS + " seconds, " +
SAMPLES_PER_SECOND + " samples will be taken every second.");
console.log("");
var buffer = [];
for (var i=0; i < NUMBER_OF_SECONDS * SAMPLES_PER_SECOND; i++) {
buffer.push(sensor.getSample());
delay(MILLISECONDS_PER_SECOND / SAMPLES_PER_SECOND );
}
// Print the number of times the reading was greater than the threshold
var count = 0;
for (var i=0; i < NUMBER_OF_SECONDS * SAMPLES_PER_SECOND; i++) {
if (buffer[i] > THRESHOLD) {
count++;
}
}
console.log(sensor.name() + " exceeded the threshold value of " +
THRESHOLD + " a total of " + count + " times,");
console.log("out of a total of " + NUMBER_OF_SECONDS*SAMPLES_PER_SECOND +
" readings.");
console.log("");
// Print a graphical representation of the average value sampled
// each second for the past 10 seconds, using a scale factor of 15
console.log("Now printing a graphical representation of the average reading ");
console.log("each second for the last " + NUMBER_OF_SECONDS + " seconds.");
var SCALE_FACTOR = 15;
for (var i=0; i < NUMBER_OF_SECONDS; i++) {
var sum = 0;
for (var j=0; j < SAMPLES_PER_SECOND; j++) {
sum += buffer[i*SAMPLES_PER_SECOND+j];
}
var average = sum / SAMPLES_PER_SECOND;
var stars_to_print = Math.round(average / SCALE_FACTOR);
var string = "(" + (" " + Math.round(average)).slice(-4) + ") | ";
for (var j=0; j < stars_to_print; j++) {
string += "*";
}
console.log(string);
}
function delay( milliseconds ) {
var startTime = Date.now();
while (Date.now() - startTime < milliseconds);
}