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79 lines
2.7 KiB
C++
79 lines
2.7 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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* This program and the accompanying materials are made available under the
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* terms of the The MIT License which is available at
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* https://opensource.org/licenses/MIT.
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*
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* SPDX-License-Identifier: MIT
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*/
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#include <cmath>
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#include <iomanip>
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#include <iostream>
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#include <stdint.h>
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#include "ldt0028.hpp"
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#include "upm_utilities.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(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, " << SAMPLES_PER_SECOND
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<< " samples will be taken every second." << std::endl
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<< std::endl;
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uint16_t buffer[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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upm_delay_us(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 " << THRESHOLD << " a total of "
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<< count << " times," << std::endl
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<< "out of a total of " << NUMBER_OF_SECONDS * SAMPLES_PER_SECOND << " readings."
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<< std::endl
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<< 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 " << std::endl
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<< "each second for the last " << 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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//! [Interesting]
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return 0;
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}
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