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91 lines
3.5 KiB
C++
91 lines
3.5 KiB
C++
/*
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* Author: Sarah Knepper <sarah.knepper@intel.com>
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* Copyright (c) 2014 Intel Corporation.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <unistd.h>
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#include <iostream>
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#include <iomanip>
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#include <cmath>
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#include "ldt0028.h"
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int
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main(int argc, char **argv)
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{
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//! [Interesting]
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const int NUMBER_OF_SECONDS = 10;
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const int MICROSECONDS_PER_SECOND = 1000000;
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const int SAMPLES_PER_SECOND = 50;
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const int THRESHOLD = 100;
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// Create the LDT0-028 Piezo Vibration Sensor object using AIO pin 0
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upm::LDT0028* sensor = new upm::LDT0028(0);
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// Read the signal every 20 milliseconds for 10 seconds
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std::cout << "For the next " << NUMBER_OF_SECONDS << " seconds, "
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<< SAMPLES_PER_SECOND << " samples will be taken every second."
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<< std::endl << std::endl;
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uint16_t* buffer = new uint16_t[NUMBER_OF_SECONDS * SAMPLES_PER_SECOND];
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for (int i=0; i < NUMBER_OF_SECONDS * SAMPLES_PER_SECOND; i++) {
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buffer[i] = (uint16_t) sensor->getSample();
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usleep(MICROSECONDS_PER_SECOND / SAMPLES_PER_SECOND);
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}
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// Print the number of times the reading was greater than the threshold
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int count = 0;
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for (int i=0; i < NUMBER_OF_SECONDS * SAMPLES_PER_SECOND; i++) {
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if (buffer[i] > THRESHOLD) {
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count++;
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}
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}
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std::cout << sensor->name() << " exceeded the threshold value of " <<
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THRESHOLD << " a total of " << count << " times," << std::endl
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<< "out of a total of " << NUMBER_OF_SECONDS*SAMPLES_PER_SECOND
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<< " readings." << std::endl << std::endl;
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// Print a graphical representation of the average value sampled
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// each second for the past 10 seconds, using a scale factor of 15
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std::cout << "Now printing a graphical representation of the average reading "
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<< std::endl << "each second for the last "
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<< NUMBER_OF_SECONDS << " seconds." << std::endl;
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const int SCALE_FACTOR = 15;
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for (int i=0; i < NUMBER_OF_SECONDS; i++) {
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long sum = 0;
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for (int j=0; j < SAMPLES_PER_SECOND; j++) {
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sum += buffer[i*SAMPLES_PER_SECOND + j];
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}
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double average = (double) sum / (double) SAMPLES_PER_SECOND;
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int stars_to_print = (int) round(average / SCALE_FACTOR);
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std::cout << "(" << std::setw(4) << (int) round(average) << ") | ";
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for (int j=0; j<stars_to_print; j++) {
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std::cout << "*";
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}
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std::cout << std::endl;
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}
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// Delete the sensor object
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delete sensor;
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//! [Interesting]
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return 0;
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}
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