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Dependencies:   MMA8451Q mbed nRF24L01P

Fork of Acclerometer_node by Sensor CDT

main.cpp@10:149ded218037, 2015-08-11 (annotated)

Committer:
jaehughes
Date:
Tue Aug 11 17:28:38 2015 +0000
Revision:
10:149ded218037
Parent:
9:934cae7f3290 
With Xbee comms

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Owen 0:a51a6e7da590 1 #include "mbed.h"
henriwts 6:7198985d3442 2 #include "math.h"
jaehughes 5:7c53f5f2af8d 3
henriwts 7:46da94ccfa67 4 Serial pc (USBTX, USBRX);
jaehughes 8:412307ba78b0 5 Serial xbee (PTE0, PTE1);
henriwts 7:46da94ccfa67 6
jaehughes 9:934cae7f3290 7 const int ARRAY_LENGTH = 50;
henriwts 6:7198985d3442 8 float temperature_celsius, temperature_voltage, light_voltage, raw_pir_reading, noise_voltage, noise_maximum, noise_average, noise_total, noise_variance, noise_sd, presence_percentage, num_consecutive_runs;
henriwts 6:7198985d3442 9 char publishString[40];
henriwts 6:7198985d3442 10 float noise_array[ARRAY_LENGTH];
henriwts 6:7198985d3442 11 int pir_array[ARRAY_LENGTH];
jaehughes 5:7c53f5f2af8d 12
henriwts 6:7198985d3442 13 //bool DEBUG_MODE = false;
jaehughes 5:7c53f5f2af8d 14
jaehughes 5:7c53f5f2af8d 15 AnalogIn light_ain(A0);
jaehughes 5:7c53f5f2af8d 16 AnalogIn temp_ain(A1);
henriwts 6:7198985d3442 17 AnalogIn pir_ain(A2);
henriwts 6:7198985d3442 18 AnalogIn noise_ain(A3);
jaehughes 5:7c53f5f2af8d 19
henriwts 6:7198985d3442 20 void publish_measurements() {
henriwts 6:7198985d3442 21 temperature_voltage = temp_ain.read_u16();
henriwts 6:7198985d3442 22 // Convert DAC reading to millivolts
henriwts 6:7198985d3442 23 temperature_voltage = (temperature_voltage * 3.3 * 1000) / 4095;
henriwts 6:7198985d3442 24 // Convert millivolts to Celsius using datasheet equation
henriwts 6:7198985d3442 25 temperature_celsius = (2103 - temperature_voltage) / 10.9;
henriwts 6:7198985d3442 26 //if(DEBUG_MODE) {
henriwts 6:7198985d3442 27 //Serial.println("Temperature (Celsius): " + String(temperature_celsius));
henriwts 6:7198985d3442 28 //}
jaehughes 5:7c53f5f2af8d 29
henriwts 6:7198985d3442 30 light_voltage = light_ain.read_u16();
jaehughes 5:7c53f5f2af8d 31
henriwts 6:7198985d3442 32 sprintf(publishString,"%.1f, %.1f, %.1f, %.1f, %.1f", temperature_celsius, light_voltage, noise_maximum, noise_average, noise_variance);
jaehughes 8:412307ba78b0 33 xbee.printf(publishString);
jaehughes 9:934cae7f3290 34 pc.printf("publish");
jaehughes 9:934cae7f3290 35 pc.printf(publishString);
henriwts 6:7198985d3442 36 sprintf(publishString, "%.1f, %.1f", presence_percentage, num_consecutive_runs);
jaehughes 10:149ded218037 37 xbee.printf(publishString);
henriwts 6:7198985d3442 38 }
henriwts 6:7198985d3442 39
henriwts 6:7198985d3442 40
henriwts 6:7198985d3442 41 void measure_pir_and_noise() {
henriwts 6:7198985d3442 42 noise_voltage = 0;
jaehughes 5:7c53f5f2af8d 43
henriwts 6:7198985d3442 44 for (int i = 0; i < ARRAY_LENGTH; i++) {
henriwts 6:7198985d3442 45 raw_pir_reading = pir_ain.read_u16();
henriwts 6:7198985d3442 46 noise_voltage = noise_ain.read_u16();
henriwts 6:7198985d3442 47 noise_array[i] = noise_voltage;
henriwts 6:7198985d3442 48 if (raw_pir_reading > 3000) {
henriwts 6:7198985d3442 49 pir_array[i] = 1;
henriwts 6:7198985d3442 50 } else {
henriwts 6:7198985d3442 51 pir_array[i] = 0;
henriwts 6:7198985d3442 52 }
henriwts 6:7198985d3442 53 //if (DEBUG_MODE) {
henriwts 6:7198985d3442 54 //Serial.println("PIR: " + String(raw_pir_reading));
henriwts 6:7198985d3442 55 //Serial.println("Noise: " + String(noise_voltage));
henriwts 6:7198985d3442 56 //}
henriwts 6:7198985d3442 57 wait(0.1);
henriwts 6:7198985d3442 58 }
jaehughes 5:7c53f5f2af8d 59 }
jaehughes 5:7c53f5f2af8d 60
jaehughes 5:7c53f5f2af8d 61
henriwts 6:7198985d3442 62 void noise_analysis() {
henriwts 6:7198985d3442 63 float residuals[ARRAY_LENGTH];
henriwts 6:7198985d3442 64 noise_maximum = 0;
henriwts 6:7198985d3442 65 noise_average = 0;
henriwts 6:7198985d3442 66 noise_variance = 0;
henriwts 6:7198985d3442 67 noise_total = 0;
jaehughes 5:7c53f5f2af8d 68
henriwts 6:7198985d3442 69 for (int i = 0; i < ARRAY_LENGTH; i++) {
henriwts 6:7198985d3442 70 if (noise_array[i] > noise_maximum) noise_maximum = noise_array[i];
henriwts 6:7198985d3442 71 noise_total += noise_array[i];
henriwts 6:7198985d3442 72 }
henriwts 6:7198985d3442 73 noise_average = noise_total / (ARRAY_LENGTH * 1.0);
jaehughes 5:7c53f5f2af8d 74
henriwts 6:7198985d3442 75 for (int i = 0; i < ARRAY_LENGTH; i++) {
henriwts 6:7198985d3442 76 residuals[i] = noise_array[i] - noise_average;
henriwts 6:7198985d3442 77 noise_variance += residuals[i] * residuals[i];
Owen 0:a51a6e7da590 78 }
henriwts 6:7198985d3442 79 noise_variance = noise_variance / (ARRAY_LENGTH * 1.0);
jaehughes 5:7c53f5f2af8d 80 }
jaehughes 5:7c53f5f2af8d 81
jaehughes 5:7c53f5f2af8d 82
henriwts 6:7198985d3442 83 void pir_analysis() {
henriwts 6:7198985d3442 84 int counts_over_1s = 0;
henriwts 6:7198985d3442 85 int longest_consecutive_run = 0;
henriwts 6:7198985d3442 86 int curr_num_consecutive = 0;
henriwts 6:7198985d3442 87
henriwts 6:7198985d3442 88 counts_over_1s = pir_array[0] == 1 ? 1 : 0;
henriwts 6:7198985d3442 89 for (int i = 1; i < ARRAY_LENGTH; i++) {
henriwts 6:7198985d3442 90 if (pir_array[i] == 1) {
henriwts 6:7198985d3442 91 ++counts_over_1s;
henriwts 6:7198985d3442 92 }
henriwts 6:7198985d3442 93 if (pir_array[i] == 1 && pir_array[i-1] == 1) {
henriwts 6:7198985d3442 94 ++curr_num_consecutive;
henriwts 6:7198985d3442 95 } else {
henriwts 6:7198985d3442 96 if (curr_num_consecutive > longest_consecutive_run) {
henriwts 6:7198985d3442 97 longest_consecutive_run = curr_num_consecutive;
henriwts 6:7198985d3442 98 curr_num_consecutive = 0;
henriwts 6:7198985d3442 99 }
henriwts 6:7198985d3442 100 }
henriwts 6:7198985d3442 101 }
henriwts 6:7198985d3442 102
henriwts 6:7198985d3442 103 presence_percentage = 100 * counts_over_1s * 1.0 / ARRAY_LENGTH;
henriwts 6:7198985d3442 104 num_consecutive_runs = longest_consecutive_run;
henriwts 6:7198985d3442 105 }
henriwts 6:7198985d3442 106
henriwts 6:7198985d3442 107
henriwts 6:7198985d3442 108 int main() {
jaehughes 8:412307ba78b0 109 while (1) {
jaehughes 8:412307ba78b0 110 measure_pir_and_noise();
jaehughes 8:412307ba78b0 111 noise_analysis();
jaehughes 8:412307ba78b0 112 pir_analysis();
jaehughes 8:412307ba78b0 113 publish_measurements();
jaehughes 8:412307ba78b0 114
henriwts 6:7198985d3442 115 }
henriwts 6:7198985d3442 116 }