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@7:43f2f7039841, 2015-09-23 (annotated)
- Committer:
- teunman
- Date:
- Wed Sep 23 13:05:49 2015 +0000
- Revision:
- 7:43f2f7039841
- Parent:
- 6:4cbf5c66e2fb
- Child:
- 8:54f0a76d35f4
two filters with two rectifiers. Works pretty good;
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
teunman | 0:674026fdd982 | 1 | #include "mbed.h" |
teunman | 0:674026fdd982 | 2 | #include "HIDScope.h" |
teunman | 0:674026fdd982 | 3 | #include "math.h" |
teunman | 0:674026fdd982 | 4 | // Define the HIDScope and Ticker object |
teunman | 4:1baefd1397d6 | 5 | HIDScope scope(3); |
teunman | 0:674026fdd982 | 6 | Ticker scopeTimer; |
teunman | 1:75f61e111ed0 | 7 | Ticker biquadTicker; |
teunman | 6:4cbf5c66e2fb | 8 | DigitalOut light(LED1); |
teunman | 1:75f61e111ed0 | 9 | |
teunman | 4:1baefd1397d6 | 10 | double v1=0, v2=0, u=0, y=0, fy=0, fv1=0, fv2=0, fu=0; |
teunman | 1:75f61e111ed0 | 11 | |
teunman | 5:56725d9362ee | 12 | //const double b0 = 0.9999999999999999,b1 = 1.9999999999999998,b2 = 0.9999999999999999, a1 = 1.9999999999999998 ,a2 = 0.9999999999999998; //low-pass Fc = 50hz fs = 100hz |
teunman | 5:56725d9362ee | 13 | //const double fb0 = 0.02008333102602092 ,fb1 = 0.04016666205204184 ,fb2 = 0.02008333102602092, fa1 = -1.5610153912536877 ,fa2 = 0.6413487153577715; //low-pass Fc = 5hz fs = 100hz |
teunman | 5:56725d9362ee | 14 | //const double b0 = 0.8005910266528649,b1 = -1.6011820533057297,b2 = 0.8005910266528649,a1 = -1.5610153912536877,a2 = 0.6413487153577715; //high-pass Fc = 5hz fs = 100hz |
teunman | 5:56725d9362ee | 15 | //const double b0 = 0.007820199259120319,b1 = 0.015640398518240638,b2 = 0.007820199259120319,a1 = -1.7347238224240125,a2 = 0.7660046194604936; //low-pass Fc = 3hz fs = 100hz |
teunman | 5:56725d9362ee | 16 | //const double b0 = 0.0009446914586925257,b1 = 0.0018893829173850514,b2 = 0.0009446914586925257,a1 = -1.911196288237583,a2 = 0.914975054072353; //low-pass Fc = 1hz fs = 100hz |
teunman | 5:56725d9362ee | 17 | //const double b0 = 0.956542835577484, b1 = -1.913085671154968, b2 = 0.956542835577484, a1 = -1.911196288237583, a2 = 0.914975054072353; //high-pass Fc = 1hz fs = 100hz |
teunman | 3:499c71ca30a0 | 18 | |
teunman | 7:43f2f7039841 | 19 | const double b0 = 0.00008765553769759188,b1 = 0.00017531107539518376,b2 = 0.00008765553769759188,a1 = -1.9733440008737442,a2 = 0.9736946230245347;//low-pass Fc = 3Hz fs = 1000hz |
teunman | 7:43f2f7039841 | 20 | //const double b0 = 0.00034604125149151127,b1 = 0.0006920825029830225, b2 = 0.00034604125149151127 ,a1 = -1.9466970561224466 ,a2 = 0.9480812211284125; //low-pass Fc = 6Hz fs = 1000hz |
teunman | 7:43f2f7039841 | 21 | //const double fb0 = 0.9149684297741606, fb1 = -1.8299368595483212, fb2 = 0.9149684297741606 ,fa1 = -1.8226935021735358, fa2 = 0.8371802169231065; // High-pass Fc = 20Hz fs = 1000hz |
teunman | 5:56725d9362ee | 22 | //const double fb0 = 0.8948577513857248 ,fb1 = -1.7897155027714495, fb2 = 0.8948577513857248,fa1 = -1.7786300789392977,fa2 = 0.8008009266036016; // High-pass Fc = 25Hz fs = 1000Hz |
teunman | 6:4cbf5c66e2fb | 23 | //const double b0 = 0.005542711916075981,b1 = 0.011085423832151962,b2 = 0.005542711916075981,a1 = -1.7786300789392977,a2 = 0.8008009266036016; //Low-pass Fc = 25Hz fs=1000Hz |
teunman | 6:4cbf5c66e2fb | 24 | //const double fb0 = 0.9780302754084559,fb1 = -1.9560605508169118,fb2 = 0.9780302754084559,fa1 = -1.9555778328194147,fa2 = 0.9565432688144089; //high-pass Fc = 6hz fs = 1000hz |
teunman | 7:43f2f7039841 | 25 | const double fb0 = 0.9911535113858849,fb1 = -1.9823070227717698,fb2 = 0.9911535113858849,fa1 = -1.9822287623675816,fa2 = 0.982385283175958; //High-pass Fc = 2Hz fs = 1000Hz |
teunman | 6:4cbf5c66e2fb | 26 | //const double fb0 = 0.0036216786873927774,fb1 = 0.007243357374785555,fb2 = 0.0036216786873927774,fa1 = -1.8226935021735358,fa2 = 0.8371802169231065; ///Low-pass Fc = 20 Hz Fs = 1000Hz |
teunman | 6:4cbf5c66e2fb | 27 | |
teunman | 3:499c71ca30a0 | 28 | |
teunman | 3:499c71ca30a0 | 29 | |
teunman | 3:499c71ca30a0 | 30 | // Read the analog input |
teunman | 3:499c71ca30a0 | 31 | AnalogIn an_in(A0); |
teunman | 3:499c71ca30a0 | 32 | |
teunman | 3:499c71ca30a0 | 33 | AnalogOut an_out(DAC0_OUT); |
teunman | 3:499c71ca30a0 | 34 | // The data read and send function |
teunman | 3:499c71ca30a0 | 35 | void scopeSend() |
teunman | 3:499c71ca30a0 | 36 | { |
teunman | 3:499c71ca30a0 | 37 | scope.set(0,y); |
teunman | 4:1baefd1397d6 | 38 | scope.set(1,fy); |
teunman | 4:1baefd1397d6 | 39 | scope.set(2,an_in); |
teunman | 3:499c71ca30a0 | 40 | |
teunman | 3:499c71ca30a0 | 41 | scope.send(); |
teunman | 3:499c71ca30a0 | 42 | } |
teunman | 3:499c71ca30a0 | 43 | |
teunman | 3:499c71ca30a0 | 44 | void computeBiquad(){ |
teunman | 7:43f2f7039841 | 45 | |
teunman | 7:43f2f7039841 | 46 | |
teunman | 7:43f2f7039841 | 47 | |
teunman | 3:499c71ca30a0 | 48 | double v = an_in - a1*v1 - a2*v2; |
teunman | 1:75f61e111ed0 | 49 | y= b0*v + b1*v1 +b2*v2; |
teunman | 1:75f61e111ed0 | 50 | v2=v1; |
teunman | 1:75f61e111ed0 | 51 | v1=v; |
teunman | 4:1baefd1397d6 | 52 | |
teunman | 7:43f2f7039841 | 53 | y = abs(y); |
teunman | 7:43f2f7039841 | 54 | |
teunman | 6:4cbf5c66e2fb | 55 | |
teunman | 4:1baefd1397d6 | 56 | double fv = y - fa1*fv1 - fa2*fv2; |
teunman | 4:1baefd1397d6 | 57 | fy= fb0*fv + fb1*fv1 + fb2*fv2; |
teunman | 4:1baefd1397d6 | 58 | fv2=fv1; |
teunman | 4:1baefd1397d6 | 59 | fv1=fv; |
teunman | 7:43f2f7039841 | 60 | |
teunman | 7:43f2f7039841 | 61 | fy = abs(fy); |
teunman | 1:75f61e111ed0 | 62 | } |
teunman | 3:499c71ca30a0 | 63 | |
teunman | 0:674026fdd982 | 64 | |
teunman | 0:674026fdd982 | 65 | int main() |
teunman | 0:674026fdd982 | 66 | { |
teunman | 6:4cbf5c66e2fb | 67 | light = 1; |
teunman | 5:56725d9362ee | 68 | // Attach the data read and send function at 1000 Hz |
teunman | 5:56725d9362ee | 69 | scopeTimer.attach_us(&scopeSend, 1e5); |
teunman | 5:56725d9362ee | 70 | biquadTicker.attach(&computeBiquad,0.0001f); |
teunman | 3:499c71ca30a0 | 71 | //float i = 1; |
teunman | 0:674026fdd982 | 72 | while(1) { |
teunman | 6:4cbf5c66e2fb | 73 | if (fy >= 0.12){ |
teunman | 6:4cbf5c66e2fb | 74 | light = 0; |
teunman | 6:4cbf5c66e2fb | 75 | } |
teunman | 6:4cbf5c66e2fb | 76 | else{ |
teunman | 6:4cbf5c66e2fb | 77 | light =1; |
teunman | 6:4cbf5c66e2fb | 78 | } |
teunman | 6:4cbf5c66e2fb | 79 | |
teunman | 4:1baefd1397d6 | 80 | |
teunman | 0:674026fdd982 | 81 | } |
teunman | 0:674026fdd982 | 82 | } |