removed dns server; first implementation of fast fourier transform for step counting

src/Graph.cpp

@@ -1,8 +1,10 @@
 #include "Graph.h"
 
 Graph::Graph (int graphSize, int graphUpdateRate) {
-            this->graphSize = graphSize;
-            this->graphUpdateRate = graphUpdateRate; // Раз в секунду
-            graphArray = new int[graphSize];
-            graphCounter = 0;
+            this->size = graphSize;
+            this->updateRate = graphUpdateRate; // Раз в секунду
+            array = new int[size];
+            fft = new int[size/2];
+            source = new int[size];
+            counter = 0;
 }

src/Graph.h

@@ -1,9 +1,11 @@
 class Graph {
     public:
-        int graphSize;
-        int graphUpdateRate;
-        int * graphArray;
-        int graphCounter;
+        int size;
+        int updateRate;
+        int * array;
+        int * fft;
+        int * source;
+        int counter;
 
         Graph (int graphSize, int graphUpdateRate);
 }; 

src/main.cpp

@@ -9,14 +9,20 @@
 #include <WebSocketsServer.h>
 #include <ArduinoJson.h>
 #include "CpuLoad.h"
-#include <DNSServer.h>
+
+#include "arduinoFFT.h"
+bool fftMode = true;
+arduinoFFT FFT = arduinoFFT();
+
 
 const char *ssid = "LabWork_1";
 
 ESP8266WebServer server(80);
-DNSServer dnsServer;
 Sensor accelerometer = Sensor();
-Graph graphAcc = Graph(200, 50);
+Graph graphAcc = Graph(256, 50);
+
+double vReal[256];
+double vImag[256];
 
 long int lastDataSend = 0;
 
@@ -61,39 +67,54 @@ int lowFreqFilter(int inputValue, int lastFilteredValue, int alpha) {
     return (lastFilteredValue +  alpha * (inputValue - lastFilteredValue)+100);
 }
 
-// TODO: необходимо перекомпоновать функцию updateAccelerometer()
 void updateAccelerometer()
 {
-    if ((millis() - accelerometer.lastUpdate) > (1000 / graphAcc.graphUpdateRate))
+    if ((millis() - accelerometer.lastUpdate) > (1000 / graphAcc.updateRate))
     {   
-        int filteredAcc = 0;
-        accelerometer.lastValue = map(analogRead(A0), 0, 1023, 200, 0);
+        int filteredSignal = 0;
+        int sourceSignal = analogRead(A0);
+        accelerometer.lastValue = map(sourceSignal, 0, 1023, graphAcc.size-1, 0);
 
-        if (graphAcc.graphCounter != 0) {
-            //filteredAcc = lowFreqFilter(accelerometer.lastValue, graphAcc.graphArray[graphAcc.graphCounter - 1], 0.5);
-            filteredAcc = graphAcc.graphArray[graphAcc.graphCounter - 1] + 0.5 * (accelerometer.lastValue - graphAcc.graphArray[graphAcc.graphCounter - 1]);
+        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.graphCounter < graphAcc.graphSize - 1)
+        if (graphAcc.counter < graphAcc.size - 1)
         {   
-            graphAcc.graphArray[graphAcc.graphCounter] = filteredAcc;
-            graphAcc.graphCounter++;
+            graphAcc.array[graphAcc.counter] = filteredSignal;
+            graphAcc.source[graphAcc.counter] = sourceSignal;
+            graphAcc.counter++;
         }
         else
         {
-            for (int i = 0; i != graphAcc.graphCounter; i++)
+            for (int i = 0; i != graphAcc.counter; i++)
             {
-                graphAcc.graphArray[i] = graphAcc.graphArray[i + 1];
-            }
-            graphAcc.graphArray[graphAcc.graphCounter] = filteredAcc;
+                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);
+            }
+        }
 
         accelerometer.lastUpdate = millis();
     }
 }
 
 
+
 void handleNotFound()
 {
     String message = "File Not Found\n\n";
@@ -105,21 +126,26 @@ void handleNotFound()
     message += server.args();
     message += "\n";
     for (uint8_t i = 0; i < server.args(); i++)
-    {
         message += " " + server.argName(i) + ": " + server.arg(i) + "\n";
-    }
     server.send(404, "text/plain", message);
 }
 
 void sendAccelerometerData() {
-    if (millis() - lastDataSend > 50) {
+
+    int updateRate = 0;
+    if (fftMode) updateRate = 200;
+    else updateRate = graphAcc.updateRate;
+
+    if (millis() - lastDataSend > updateRate) {
         String word;
-        cookAccelerometer(word, graphAcc.graphArray, graphAcc.graphSize);
+        cookAccelerometer(word, graphAcc.fft, graphAcc.size/2);
         webSocket.broadcastTXT(word);
+        Serial.println(word);
         lastDataSend = millis();
     }
 }
 
+
 void webSocketEvent(uint8_t num, WStype_t type, uint8_t * payload, size_t length) {
     switch(type) {
         case WStype_TEXT:
@@ -129,6 +155,7 @@ void webSocketEvent(uint8_t num, WStype_t type, uint8_t * payload, size_t length
 }
 
 
+
 void setup(void)
 {
     IPAddress apIP(192, 168, 1, 1);