4 directional EMG control of the XY table. Made during my bachelor end assignment.
Dependencies: C12832_lcd HIDScope mbed-dsp mbed
Revision 45:f5d74c7f8fbf, committed 2015-06-05
- Comitter:
- jessekaiser
- Date:
- Fri Jun 05 09:22:43 2015 +0000
- Parent:
- 44:d5aa53e4778c
- Child:
- 46:7a7cb589579a
- Commit message:
- 2 directie aansturingen werkt nu! Ook geen pull out torque kwesties meer.
Changed in this revision
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/HIDScope.lib Fri Jun 05 09:22:43 2015 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/users/tomlankhorst/code/HIDScope/#e44574634162
--- a/main.cpp Thu Jun 04 14:36:52 2015 +0000 +++ b/main.cpp Fri Jun 05 09:22:43 2015 +0000 @@ -1,43 +1,180 @@ #include "mbed.h" #include "C12832_lcd.h" +#include "arm_math.h" +#include "HIDScope.h" -#define P_GAIN 0.998 +#define K_Gain 14 //Gain of the filtered EMG signal +#define Damp 5 //Deceleration of the motor +#define Mass 1 // Mass value +#define dt 0.002 //Sample frequency +#define MAX_bi 0.09 //Can be used for normalisation of the EMG signal of the biceps +#define MAX_tri 0.09 +#define MIN_freq 500 //The motor turns off below this frequency +#define EMG_tresh 0.02 +//Motor control DigitalOut Dir(p21); PwmOut Step(p22); -DigitalOut Enable(p14); + +//Signal to and from computer +Serial pc(USBTX, USBRX); + +DigitalOut Enable(p25); + +//Microstepping DigitalOut MS1(p27); DigitalOut MS2(p28); DigitalOut MS3(p29); + +//Potmeter and EMG AnalogIn Pot1(p19); AnalogIn Pot2(p20); + +AnalogIn emg1(p17); //EMG bordje bovenop, biceps +AnalogIn emg2(p15); //triceps +HIDScope scope(2); +Ticker scopeTimer; + +//lcd C12832_LCD lcd; -BusIn Joystick(p12,p13,p14,p15,p16); -DigitalIn Up(p15); -DigitalIn Down(p12); +//Variables for motor control +float setpoint = 4400; //Frequentie setpint +float step_freq1 = 1; +float step_freq2 = 1; + +//EMG filter +arm_biquad_casd_df1_inst_f32 lowpass_biceps; +arm_biquad_casd_df1_inst_f32 lowpass_triceps; +//lowpass filter settings: Fc = 2 Hz, Fs = 500 Hz, Gain = -3 dB +float lowpass_const[] = {0.00015514839749793376, 0.00031029679499586753, 0.00015514839749793376, 1.9644602512795832, -0.9650808448695751}; +arm_biquad_casd_df1_inst_f32 highnotch_biceps; +arm_biquad_casd_df1_inst_f32 highnotch_triceps; +//highpass filter settings: Fc = 20 Hz, Fs = 500 Hz, notch Fc = 50, Fs = 500 Hz +float highnotch_const[] = {0.8370879899975344, -1.6741759799950688, 0.8370879899975344, 1.6474576182593796, -0.7008943417307579, 0.7063988100714527, -1.1429772843080923, 0.7063988100714527, 1.1429772843080923, -0.41279762014290533}; + +//state values +float lowpass_biceps_states[4]; +float highnotch_biceps_states[8]; +float lowpass_triceps_states[4]; +float highnotch_triceps_states[8]; + +//global variabels +float filtered_biceps; +float filtered_triceps; +float speed_old1; +float speed_old2; +float acc1; +float acc2; +float force1; +float force2; +float speed1; +float speed2; +float damping1; +float damping2; + +void looper_emg() +{ + + + float emg_value1_f32; + emg_value1_f32 = emg1.read(); + + float emg_value2_f32; + emg_value2_f32 = emg2.read(); + + //process emg biceps + arm_biquad_cascade_df1_f32(&highnotch_biceps, &emg_value1_f32, &filtered_biceps, 1 ); + filtered_biceps = fabs(filtered_biceps); + arm_biquad_cascade_df1_f32(&lowpass_biceps, &filtered_biceps, &filtered_biceps, 1 ); + + //process emg triceps + arm_biquad_cascade_df1_f32(&highnotch_triceps, &emg_value2_f32, &filtered_triceps, 1 ); + filtered_triceps = fabs(filtered_triceps); + arm_biquad_cascade_df1_f32(&lowpass_triceps, &filtered_triceps, &filtered_triceps, 1 ); + + /*send value to PC. */ + scope.set(0,filtered_biceps); //Filtered EMG signal + scope.set(1,filtered_triceps); +} + +void looper_motor() +{ + //Vooruit + force1 = K_Gain*(filtered_biceps/MAX_bi); + force1 = force1 - damping1; + acc1 = force1/Mass; + speed1 = speed_old1 + (acc1 * dt); + damping1 = speed1 * Damp; + step_freq1 = (setpoint*speed1); + speed_old1 = speed1; + + //Achteruit triceps + force2 = K_Gain*(filtered_triceps/MAX_tri); + force2 = force2 - damping2; + acc2 = force2/Mass; + speed2 = speed_old2 + (acc2 * dt); + damping2 = speed2 * Damp; + step_freq2 = (setpoint*speed2); + speed_old2 = speed2; + if (filtered_biceps > filtered_triceps) { + Dir = 0; + speed2 = 0.01; + speed_old2 = 0.01; + Step.period(1.0/step_freq1); + } if (filtered_triceps > filtered_biceps) { + Dir = 1; + speed1 = 0.01; + speed_old1 = 0.01; + Step.period(1.0/step_freq2); + } + //Speed limit + if (speed1 > 1) { + speed1 = 1; + step_freq1 = setpoint; + } + if (speed2 > 1) { + speed2 = 1; + step_freq2 = setpoint; + } + //EMG treshold + if (filtered_biceps < EMG_tresh && filtered_triceps < EMG_tresh) { + Enable = 1; //Enable = 1 turns the motor off. + speed1 = 0.01; + speed_old1 = 0.01; + speed2 = 0.01; + speed_old2 = 0.01; + } else { + Enable = 0; + } + +} + int main() { - Enable = 0; - float setpoint = 2500; //Frequentie - float step_freq = 1; + // Attach the HIDScope::send method from the scope object to the timer at 500Hz. Hier wordt de sample freq aangegeven. + scopeTimer.attach_us(&scope, &HIDScope::send, 2e3); + + Ticker emgtimer; + arm_biquad_cascade_df1_init_f32(&lowpass_biceps, 1 , lowpass_const, lowpass_biceps_states); + arm_biquad_cascade_df1_init_f32(&highnotch_biceps, 2 , highnotch_const, highnotch_biceps_states); + arm_biquad_cascade_df1_init_f32(&lowpass_triceps, 1 , lowpass_const, lowpass_triceps_states); + arm_biquad_cascade_df1_init_f32(&highnotch_triceps, 2 , highnotch_const, highnotch_triceps_states); + emgtimer.attach(looper_emg, 0.002); + + Ticker looptimer; + looptimer.attach(looper_motor, 0.01); //Uitzoeken waarom deze frequentie! + + //Microstepping control MS1 = 1; - MS2 = 1; + MS2 = 0; MS3 = 0; - float p1; - Step.period(1./step_freq); // 1 kHz, vanaf 2,5 kHz doet de motor het niet meer. Step.write(0.5); // Duty cycle van 50% - // Dir = Pot1; // Dir 1 is naar boven, Dir 0 naar onder. - Enable = 1; + while (1) { - p1 = Pot1.read(); - Dir = 0; - float new_step_freq; - new_step_freq = ((1-P_GAIN)*setpoint) + (P_GAIN*step_freq); - step_freq = new_step_freq; - Step.period(1.0/step_freq); - lcd.printf("freq : %.0f \n", step_freq); - wait(0.01); //Hier nog ticker inbouwen + //lcd.printf("Bi %.2f ,Tri %.2f \n", filtered_biceps, filtered_triceps); //snelheid meting op lcd + lcd.printf("1 %.0f, 2 %.0f \n", step_freq1, step_freq2); + wait(0.01); } -} \ No newline at end of file +}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed-dsp.lib Fri Jun 05 09:22:43 2015 +0000 @@ -0,0 +1,1 @@ +http://mbed.org/teams/mbed-official/code/mbed-dsp/#7a284390b0ce