first ver of step counter method, may be some unstable work

src/main.cpp

@@ -7,14 +7,13 @@
 #include <WebSocketsServer.h>
 #include <ArduinoJson.h>
 #include "CpuLoad.h"
+#include <Ticker.h>
 
 #include "arduinoFFT.h"
-bool fftMode = true;
 arduinoFFT FFT = arduinoFFT();
 
 
 const char *ssid = "LabWork_1";
-
 ESP8266WebServer server(80);
 Sensor accelerometer = Sensor();
 Graph graphAcc = Graph(256, 50);
@@ -44,14 +43,8 @@ void handleAccelerometer()
     const int arr_size = 7000;
     char *html_code = new char[arr_size];
     memset(html_code, '\0', sizeof(char) * arr_size);
-
     bias += getHtml(HTML_BEGIN, *html_code, arr_size, 0);
-    // bias += getHtml(STYLE, *html_code, arr_size, bias);
-    // bias += getHtml(SCRIPT, *html_code, arr_size, bias);
-    // bias += getHtml(HTML_END, *html_code, arr_size, bias);
-
     server.send(200, "text/html", html_code);
-
     delete[] html_code;
 }
 
@@ -82,54 +75,75 @@ int lowFreqFilter(int inputValue, int lastFilteredValue, int alpha) {
 
 void updateAccelerometer()
 {
-    if ((millis() - accelerometer.lastUpdate) > (1000 / graphAcc.updateRate))
-    {   
-        int filteredSignal = 0;
-        int sourceSignal = analogRead(A0);
-        accelerometer.lastValue = map(sourceSignal, 0, 1023, graphAcc.size-1, 0);
+    int filteredSignal = 0;
+    int sourceSignal = analogRead(A0);
+    accelerometer.lastValue = map(sourceSignal, 0, 1023, graphAcc.size-1, 0);
 
-        if (graphAcc.counter != 0) {
-            //filteredSignal = lowFreqFilter(accelerometer.lastValue, graphAcc.array[acc.graphCounter - 1], 0.5);
-            filteredSignal = graphAcc.array[graphAcc.counter - 1] + 0.5 * (accelerometer.lastValue - graphAcc.array[graphAcc.counter - 1]);
-        }
+    if (graphAcc.counter != 0) {
+        filteredSignal = graphAcc.array[graphAcc.counter - 1] + 0.5 * (accelerometer.lastValue - graphAcc.array[graphAcc.counter - 1]);
+    }
 
-        if (graphAcc.counter < graphAcc.size - 1)
+    if (graphAcc.counter < graphAcc.size - 1)
+    {   
+        graphAcc.array[graphAcc.counter] = filteredSignal;
+        graphAcc.source[graphAcc.counter] = sourceSignal;
+        graphAcc.counter++;
+    }
+    else
+    {
+        for (int i = 0; i != graphAcc.counter; i++)
         {
-            graphAcc.array[graphAcc.counter] = filteredSignal;
-            graphAcc.source[graphAcc.counter] = sourceSignal;
-            graphAcc.counter++;
+            graphAcc.array[i] = graphAcc.array[i + 1];
+            graphAcc.source[i] = graphAcc.source[i + 1];
+        }
+        graphAcc.array[graphAcc.counter] = filteredSignal;
+        graphAcc.source[graphAcc.counter] = sourceSignal;
+        graphAcc.peakFreqArray[graphAcc.counter] = peakFreq;
+        
+        //start fft
+        for (int i = 0; i < graphAcc.size; i++) {
+            vReal[i] = (double) graphAcc.source[i];
+            vImag[i] = 0;
+        }
+        FFT.Windowing(vReal, graphAcc.size, FFT_WIN_TYP_RECTANGLE, FFT_FORWARD);
+        FFT.Compute(vReal, vImag, graphAcc.size, FFT_FORWARD);
+        FFT.ComplexToMagnitude(vReal, vImag, graphAcc.size);
+        for (int i = 0; i < graphAcc.size/2; i++) {
+            graphAcc.fft[i] = map((int) vReal[i], 0, 15000, 200, 0);
         }
-        else
-        {
-            for (int i = 0; i != graphAcc.counter; i++)
-            {
-                graphAcc.array[i] = graphAcc.array[i + 1];
-                graphAcc.source[i] = graphAcc.source[i + 1];
-            }
-            graphAcc.array[graphAcc.counter] = filteredSignal;
-            graphAcc.source[graphAcc.counter] = sourceSignal;
-            
-            //start fft
-            for (int i = 0; i < graphAcc.size; i++) {
-                vReal[i] = (double) graphAcc.source[i];
-                vImag[i] = 0;
-            }
-            FFT.Windowing(vReal, graphAcc.size, FFT_WIN_TYP_RECTANGLE, FFT_FORWARD);
-            FFT.Compute(vReal, vImag, graphAcc.size, FFT_FORWARD);
-            FFT.ComplexToMagnitude(vReal, vImag, graphAcc.size);
-            for (int i = 0; i < graphAcc.size/2; i++) {
-                graphAcc.fft[i] = map((int) vReal[i], 0, 15000, 200, 0);
-            }
 
         
         peakFreq = FFT.MajorPeak(vReal, graphAcc.size, 30);    
+        for (int i = 0; i != 127; i++) {
+            graphAcc.peakFreqArray[i] = graphAcc.peakFreqArray[i + 1];
         }
-
-        accelerometer.lastUpdate = millis();
+        graphAcc.peakFreqArray[127] = peakFreq;
     }
 }
 
+void stepUpdater () {
+    int sensorsUpdateRate = 15; // samples/sec
+    double slidingWindow = 1.2; //secs
+    double fftWindow = 8.5; //secs
+    for (int i = 0; i < sensorsUpdateRate * fftWindow; i = i + sensorsUpdateRate * slidingWindow) {
         
+        int amplCounter = 0;
+        int cycleCounter = 0;
+        double stepCounter = 0;
+        for (int j = i; (j < (sensorsUpdateRate * slidingWindow + i)) && (j < sensorsUpdateRate * fftWindow); j++) {
+            
+            if ((0.7 < graphAcc.peakFreqArray[j]) && (graphAcc.peakFreqArray[j] < 2.2)) {
+                amplCounter++;
+                stepCounter = stepCounter + (graphAcc.peakFreqArray[j] / (sensorsUpdateRate * slidingWindow));
+            }
+            cycleCounter++;
+        }
+        if ((amplCounter / cycleCounter) > 0.7) {
+            steps = steps + (int)(stepCounter);
+        }
+        ESP.wdtFeed();
+    }
+}
 
 void handleNotFound()
 {