Measures EMG signal, filters them and puts on a led
Dependencies: HIDScope MODSERIAL Math MovingAverage biquadFilter mbed
Fork of EMG by
main.cpp
- Committer:
- Roooos
- Date:
- 2018-10-26
- Revision:
- 21:30a33a4aa868
- Parent:
- 20:97059009a491
File content as of revision 21:30a33a4aa868:
#include "mbed.h" #include "HIDScope.h" #include "BiQuad.h" #include "MovingAverage.h" #include "MODSERIAL.h" #include "math.h" #define NSAMPLE 200 //Define objects AnalogIn emg0( A0 ); //Biceps Left AnalogIn emg1( A1 ); //Biceps Right InterruptIn button(PTC6); InterruptIn button2(PTA4); Ticker sample_timer; //Ticker driving_timer; HIDScope scope( 4 ); //Number of Channels DigitalOut led1(LED_GREEN); DigitalOut led2(LED_BLUE); DigitalOut led3(LED_RED); MovingAverage <double>Movag_LB(NSAMPLE,0.0); //Make Moving Average, Define NSAMPLE above MovingAverage <double>Movag_RB(NSAMPLE,0.0); MODSERIAL pc(USBTX, USBRX); volatile bool BicepLeft = false; volatile bool BicepRight = false; //Make Biquad filters Left(a0, a1, a2, b1, b2) BiQuadChain bqc1; //chain voor High Pass en Notch BiQuad bq1(0.39131200825291007, -0.7826240165058201, 0.39131200825291007, -0.36950493743858204, 0.1957430955730582); //High Pass Filter BiQuad bq2(9.91104e-01, -1.60364e+00, 9.91104e-01, -1.60364e+00, 9.82207e-01); //Notch Filter BiQuad bq3(0.00044924972004654657, 0.0008984994400930931, 0.00044924972004654657, -1.6169385656964415, 0.6187355645766276); //Low Pass Filter //Make Biquad filters Right BiQuadChain bqc2; //chain voor High Pass en Notch BiQuad bq4(0.39131200825291007, -0.7826240165058201, 0.39131200825291007, -0.36950493743858204, 0.1957430955730582); //High Pass Filter BiQuad bq5(9.91104e-01, -1.60364e+00, 9.91104e-01, -1.60364e+00, 9.82207e-01); //Notch Filter //Function to read samples and filter and send to HIDScope void sample() { //Filter Left Bicep double LB_Filter_1 = bqc1.step(emg0.read()); //High Pass + Notch double LB_Rectify = fabs(LB_Filter_1); //Rectify Signal //double Filtered_emg_1 = bq3.step(LB_Rectify); //Low Pass Movag_LB.Insert(LB_Rectify); double LB_Out = Movag_LB.GetAverage(); //Filter Right Bicep double RB_Filter_1 = bqc2.step(emg1.read()); //High Pass + Notch double RB_Rectify = fabs(RB_Filter_1); //Rectify Signal //double Filtered_emg_1 = bq3.step(RB_Rectify); //Low Pass Movag_RB.Insert(RB_Rectify); double RB_Out = Movag_RB.GetAverage(); scope.set(0, emg0.read() ); //Raw EMG signal left bicep scope.set(1, LB_Out); // Filtered EMG signal left bicep scope.set(2, emg1.read()); //Raw EMG signal right bicep scope.set(3, RB_Out); //Filtered EMG signal right bicep scope.send(); if (LB_Out > ThresholdLeft) { led1 = 0; BicepLeft = true; } else { led1 = 1; BicepLeft = false; } if (RB_Out > ThresholdRight) { led2 = 0; BicepRight = true; } else { led2 = 1; BicepRight = false; } } int main() { bqc1.add( &bq1 ).add( &bq2 ); //make BiQuadChain bqc2.add( &bq4 ).add( &bq5 ); //make BiQuadChain sample_timer.attach(&sample, 0.002); //read samples at 500 Hz while(1) {} }