EMG converter with movement code for 1 motor
Dependencies: HIDScope MODSERIAL QEI biquadFilter mbed
Fork of EMG_converter_code by
main.cpp
- Committer:
- s1483080
- Date:
- 2015-10-27
- Revision:
- 8:5f13198a8e49
- Parent:
- 7:87d9904c1c19
File content as of revision 8:5f13198a8e49:
#include "mbed.h" #include "HIDScope.h" #include "biquadFilter.h" // Require the HIDScope library #include "MODSERIAL.h" #include "QEI.h" //Define objects AnalogIn emg(A0); //Analog of EMG input Ticker sample_timer; Ticker motor_timer; Ticker cal_timer; HIDScope scope(2); // Instantize a 2-channel HIDScope object DigitalIn button1(PTA4);//test button for starting motor 1 DigitalOut led1(LED_RED); DigitalOut led2(LED_BLUE); DigitalOut led3(LED_GREEN); MODSERIAL pc(USBTX,USBRX); // motor objects QEI motor1(D13,D12,NC, 624);//encoder for motor 1 QEI motor2(D11,D10,NC, 624);//encoder for motor 2 DigitalOut direction1(D7);//direction input for motor 1 DigitalOut direction2(D4);//direction input for motor 2 PwmOut speed1(D6);//speed input for motor 1 PwmOut speed2(D5);//speed input for motor 2 /*The biquad filters required to transform the EMG signal into an usable signal*/ biquadFilter filterhigh1(-1.1430, 0.4128, 0.6389, -1.2779, 0.6389); biquadFilter filterlow1(1.9556, 0.9565, 0.9780, 1.9561, 0.9780); biquadFilter notch(-1.1978e-16, 0.9561, 0.9780, -1.1978e-16, 0.9780); biquadFilter filterlow2(-1.9645, 0.9651, 1.5515e-4, 3.1030e-4, 1.5515e-4); double emg_value; double signalpart1; double signalpart2; double signalpart3; double signalpart4; double signalfinal; double onoffsignal; double maxcal=0; bool calyes=0; bool motor1_dir=0;//set the direction of motor 1 bool motor2_dir = 0;//set the direction of motor 1 float cycle = 0.3;//define the speed of the motor bool motor1_on = 1;//set the on variable of motor 1 bool motor2_on =1;//set the on variable of motor 2 int n1=1;//numeric conditions to determine if the speed needs to be increased int n2=1; void changedirmotor1(){ motor1_dir = !motor1_dir;//code for changing direction of motor 1 } void changedirmotor2(){ motor2_dir = !motor2_dir;//code for changing direction of motor 2 } /* */ void filter(){ if(calyes==1){ emg_value = emg.read();//read the emg value from the elektrodes signalpart1 = notch.step(emg_value);//Highpass filter for removing offset and artifacts signalpart2 = filterhigh1.step(signalpart1);//rectify the filtered signal signalpart3 = abs(signalpart2);//low pass filter to envelope the emg signalpart4 = filterlow1.step(signalpart3);//notch filter to remove 50Hz signal signalfinal = filterlow2.step(signalpart4);//2nd low pass filter to envelope the emg onoffsignal=signalfinal/maxcal;//divide the emg signal by the max EMG to calibrate the signal per person scope.set(0,emg_value);//set emg signal to scope in channel 1 scope.set(1,onoffsignal);//set filtered signal to scope in channel 2 scope.send();//send the signals to the scope //pc.printf("emg signal %f, filtered signal %f \n",emg_value,onoffsignal); } } void checkmotor(){//check the normalized signal and set actions if a threshold is passed if(calyes==1){ if(onoffsignal >= 0.5){ led1.write(0); led2.write(1); while(n1 == 1){ changedirmotor1(); speed1.write(cycle);//write speed only on first run through the loop direction1.write(motor1_dir);//turn motor CCW or CW n1=0; } } else if(onoffsignal<=0.25){ led1.write(1); led2.write(0); while(n1==0){//check if the first run was done speed1.write(0);//if so set speed to 0 and reset the run counter n1=1; } } } } void calibri(){//calibration function if(button1.read()==false){ for(int n =0; n<5000;n++){//read for 5000 samples as calibration emg_value = emg.read();//read the emg value from the electrodes signalpart1 = notch.step(emg_value);//Highpass filter for removing offset and artifacts signalpart2 = filterhigh1.step(signalpart1);//rectify the filtered signal signalpart3 = abs(signalpart2);//low pass filter to envelope the emg signalpart4 = filterlow1.step(signalpart3);//notch filter to remove 50Hz signal signalfinal = filterlow2.step(signalpart4);//2nd low pass filter to envelope the emg double signalmeasure = signalfinal; if (signalmeasure > maxcal){//determine what the highest reachable emg signal is maxcal = signalmeasure; } } calyes=1; } } int main() { pc.baud(115200); led1.write(1); led2.write(1); sample_timer.attach(&filter, 0.002);//continously execute the EMG reader and filter motor_timer.attach(&checkmotor, 0.002);//continously execute the motor controller cal_timer.attach(&calibri, 0.002);//ticker to check if motor is being calibrated while(1){ //random while loop to keep system going } }