1 /* 2 * Author: Sarah Knepper <sarah.knepper (at) 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 31 int 32 main(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
