1/*
2 * Author: Sarah Knepper <sarah.knepper@intel.com>
3 * Copyright (c) 2014 Intel Corporation.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining
6 * a copy of this software and associated documentation files (the
7 * "Software"), to deal in the Software without restriction, including
8 * without limitation the rights to use, copy, modify, merge, publish,
9 * distribute, sublicense, and/or sell copies of the Software, and to
10 * permit persons to whom the Software is furnished to do so, subject to
11 * the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be
14 * included in all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
17 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
19 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
20 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
21 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
22 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23 */
24
25#include <unistd.h>
26#include <iostream>
27#include <iomanip>
28#include <cmath>
29#include "ldt0028.h"
30
31int
32main(int argc, char **argv)
33{
34//! [Interesting]
35    const int NUMBER_OF_SECONDS = 10;
36    const int MICROSECONDS_PER_SECOND = 1000000;
37    const int SAMPLES_PER_SECOND = 50;
38    const int THRESHOLD = 100;
39
40    // Create the LDT0-028 Piezo Vibration Sensor object using AIO pin 0
41    upm::LDT0028* sensor = new upm::LDT0028(0);
42
43    // Read the signal every 20 milliseconds for 10 seconds
44    std::cout << "For the next " << NUMBER_OF_SECONDS << " seconds, "
45              << SAMPLES_PER_SECOND << " samples will be taken every second."
46              << std::endl << std::endl;
47    uint16_t* buffer = new uint16_t[NUMBER_OF_SECONDS * SAMPLES_PER_SECOND];
48    for (int i=0; i < NUMBER_OF_SECONDS * SAMPLES_PER_SECOND; i++) {
49        buffer[i] = (uint16_t) sensor->getSample();
50        usleep(MICROSECONDS_PER_SECOND / SAMPLES_PER_SECOND);
51    }
52
53    // Print the number of times the reading was greater than the threshold
54    int count = 0;
55    for (int i=0; i < NUMBER_OF_SECONDS * SAMPLES_PER_SECOND; i++) {
56        if (buffer[i] > THRESHOLD) {
57            count++;
58        }
59    }
60    std::cout << sensor->name() << " exceeded the threshold value of " <<
61        THRESHOLD << " a total of " << count << " times," << std::endl
62        << "out of a total of " << NUMBER_OF_SECONDS*SAMPLES_PER_SECOND
63        << " readings." << std::endl << std::endl;
64
65    // Print a graphical representation of the average value sampled
66    // each second for the past 10 seconds, using a scale factor of 15
67    std::cout << "Now printing a graphical representation of the average reading "
68        << std::endl << "each second for the last "
69        << NUMBER_OF_SECONDS << " seconds." << std::endl;
70    const int SCALE_FACTOR = 15;
71    for (int i=0; i < NUMBER_OF_SECONDS; i++) {
72        long sum = 0;
73        for (int j=0; j < SAMPLES_PER_SECOND; j++) {
74            sum += buffer[i*SAMPLES_PER_SECOND + j];
75        }
76        double average = (double) sum / (double) SAMPLES_PER_SECOND;
77        int stars_to_print = (int) round(average / SCALE_FACTOR);
78        std::cout << "(" << std::setw(4) << (int) round(average) << ") | ";
79        for (int j=0; j<stars_to_print; j++) {
80            std::cout << "*";
81        }
82        std::cout << std::endl;
83    }
84
85    // Delete the sensor object
86    delete sensor;
87//! [Interesting]
88
89    return 0;
90}
91