Diff: main.cpp

Revision:

0:557b1ff83a8a

Child:

1:98be4152a539

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Oct 06 12:02:22 2015 +0000
@@ -0,0 +1,73 @@
+#include "mbed.h"
+#include "HIDScope.h"
+#include "encoder.h"
+#include "Filter.h"
+
+AnalogIn    emg(A0); //Analog input van emg kabels
+Ticker      EMGticker;
+HIDScope    scope(2); //2 scopes
+
+// constante variabelen:
+
+//Sample frequentie
+Fs = 500; //Hz
+t = 1/ Fs; // voor EMGticker
+
+// Filter1a: 50Hz Notch
+double v1_50a = 0, v2_50a = 0;
+const double a1_50a = -1.61803398875, a2_50a = 1.00000000000;
+const double b0_50a = 1.00000000000, b1_50a = -1.61803398875, b2_50a = 1.00000000000;
+
+// Filter1b: 50Hz Notch
+double v1_50b = 0, v2_50b = 0;
+const double a1_50b = -1.61803398875, a2_50b = 1.00000000000;
+const double b0_50b = 1.00000000000, b1_50b = -1.61803398875, b2_50b = 1.00000000000;
+
+// Filter1: 20Hz HighPass
+double v1_HP = 0, v2_HP = 0;
+const double a1_HP = -0.76475499450, a2_HP = 0.27692273367;
+const double b0_HP = 1.00000000000, b1_HP = -2.00000000000, b2_HP = 1.00000000000;
+
+// Filter1: 5Hz LowPass
+double v1_LP = 0, v2_LP = 0;
+const double a1_LP = -1.16338171052, a2_LP = 0.42191097989;
+const double b0_LP = 1.00000000000, b1_LP = 2.00000000000, b2_LP = 1.00000000000;
+
+
+void EMGfilter()
+{
+    //u = input waarde
+    //y = output waarde
+
+    double u = emg.read(); // lees waarde van emg signaal uit
+    
+    // Op deze manier worden de waardes ingelezen in Filter. Zorg dus voor dezelfde volgorde, zodat de waardes goed uitgelezen worden!:
+    // Filter(double u, double &v1, double &v2, const double a1, const double a2, const double b0, const double b1, const double b2)
+    
+    // 50Hz Notch filter
+    double y50a = double Filter(u, v1_50a, v2_50a, a1_50a, a2_50a, b0_50a, b1_50a, b2_50a);
+    double y50b = double Filter(y50a, v1_50b, v2_50b, a1_50b, a2_50b, b0_50b, b1_50b, b2_50b);
+    
+    // High Pass filter. Tot 20Hz wordt weggefliterd
+    double yHP = double Filter(y50b, v1_HP, v2_HP, a1_HP, a2_HP, b0_HP, b1_HP, b2_HP);
+    
+    // Absolute waarde wordt genomen.
+    double y1 = fabs(yHP);
+    
+    // Low Pass filter. Alles vanaf 5Hz wordt weggefilterd 
+    double yLP = double Filter(y1, v1_LP, v2_LP, a1_LP, a2_LP, b0_LP, b1_LP, b2_LP);
+    
+    double y = yLP;
+    
+    // Plotten in HIDscope
+    scope.set(0,u); //ongefilterde waarde naar scope 1
+    scope.set(1,y); //gefilterde waarde naar scope 2
+    scope.send(); //stuur de waardes naar HIDscope
+}
+
+
+int main(){
+    EMGticker.attach(&EMGfilter, t) //500Hz
+    while(1){}
+    }
+    
\ No newline at end of file