![](/media/cache/group/default_image.jpg.50x50_q85.jpg)
Emg filter function script for a uni project. Made by Teun van der Molen
Dependencies: HIDScope MODSERIAL mbed
Fork of frdm_EMG by
main.cpp
- Committer:
- teunman
- Date:
- 2015-09-21
- Revision:
- 3:499c71ca30a0
- Parent:
- 2:ce5ead27b7cc
- Child:
- 4:1baefd1397d6
File content as of revision 3:499c71ca30a0:
#include "mbed.h" #include "HIDScope.h" #include "math.h" // Define the HIDScope and Ticker object HIDScope scope(2); Ticker scopeTimer; Ticker biquadTicker; double v1=0, v2=0, u=0, y=0; const double //b0 = 0.9999999999999999,b1 = 1.9999999999999998,b2 = 0.9999999999999999, a1 = 1.9999999999999998 ,a2 = 0.9999999999999998; //low-pass Fc = 50hz //b0 = 0.02008333102602092 ,b1 = 0.04016666205204184 ,b2 = 0.02008333102602092, a1 = -1.5610153912536877 ,a2 = 0.6413487153577715; //low-pass Fc = 5hz //b0 = 0.8005910266528649,b1 = -1.6011820533057297,b2 = 0.8005910266528649,a1 = -1.5610153912536877,a2 = 0.6413487153577715; //high-pass Fc = 5hz b0 = 0.007820199259120319,b1 = 0.015640398518240638,b2 = 0.007820199259120319,a1 = -1.7347238224240125,a2 = 0.7660046194604936; //low-pass Fc = 3hz //b0 = 0.0009446914586925257,b1 = 0.0018893829173850514,b2 = 0.0009446914586925257,a1 = -1.911196288237583,a2 = 0.914975054072353; //low-pass Fc = 1hz // Read the analog input AnalogIn an_in(A0); AnalogOut an_out(DAC0_OUT); // The data read and send function void scopeSend() { scope.set(0,y); scope.set(1,an_in); scope.send(); } void computeBiquad(){ double v = an_in - a1*v1 - a2*v2; y= b0*v + b1*v1 +b2*v2; v2=v1; v1=v; } int main() { // Attach the data read and send function at 100 Hz scopeTimer.attach_us(&scopeSend, 1e4); biquadTicker.attach(&computeBiquad,0.01f); //float i = 1; while(1) { // sinewave output // float u = (0.25 + 0.1*sin(i) + (0.25 + 0.1*sin(100*i))); // i = i+0.01; // an_out = y; // wait(0.01); // double an_in = y; } }