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4 directional EMG control of the XY table. Made during my bachelor end assignment.
Dependencies: C12832_lcd HIDScope mbed-dsp mbed
main.cpp@45:f5d74c7f8fbf, 2015-06-05 (annotated)
- Committer:
- jessekaiser
- Date:
- Fri Jun 05 09:22:43 2015 +0000
- Revision:
- 45:f5d74c7f8fbf
- Parent:
- 44:d5aa53e4778c
- Child:
- 46:7a7cb589579a
2 directie aansturingen werkt nu! Ook geen pull out torque kwesties meer.
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
jessekaiser | 0:3acdd563582f | 1 | #include "mbed.h" |
jessekaiser | 10:7f94cd65c910 | 2 | #include "C12832_lcd.h" |
jessekaiser | 45:f5d74c7f8fbf | 3 | #include "arm_math.h" |
jessekaiser | 45:f5d74c7f8fbf | 4 | #include "HIDScope.h" |
jessekaiser | 0:3acdd563582f | 5 | |
jessekaiser | 45:f5d74c7f8fbf | 6 | #define K_Gain 14 //Gain of the filtered EMG signal |
jessekaiser | 45:f5d74c7f8fbf | 7 | #define Damp 5 //Deceleration of the motor |
jessekaiser | 45:f5d74c7f8fbf | 8 | #define Mass 1 // Mass value |
jessekaiser | 45:f5d74c7f8fbf | 9 | #define dt 0.002 //Sample frequency |
jessekaiser | 45:f5d74c7f8fbf | 10 | #define MAX_bi 0.09 //Can be used for normalisation of the EMG signal of the biceps |
jessekaiser | 45:f5d74c7f8fbf | 11 | #define MAX_tri 0.09 |
jessekaiser | 45:f5d74c7f8fbf | 12 | #define MIN_freq 500 //The motor turns off below this frequency |
jessekaiser | 45:f5d74c7f8fbf | 13 | #define EMG_tresh 0.02 |
jessekaiser | 31:372ff8d49430 | 14 | |
jessekaiser | 45:f5d74c7f8fbf | 15 | //Motor control |
jessekaiser | 0:3acdd563582f | 16 | DigitalOut Dir(p21); |
jessekaiser | 0:3acdd563582f | 17 | PwmOut Step(p22); |
jessekaiser | 45:f5d74c7f8fbf | 18 | |
jessekaiser | 45:f5d74c7f8fbf | 19 | //Signal to and from computer |
jessekaiser | 45:f5d74c7f8fbf | 20 | Serial pc(USBTX, USBRX); |
jessekaiser | 45:f5d74c7f8fbf | 21 | |
jessekaiser | 45:f5d74c7f8fbf | 22 | DigitalOut Enable(p25); |
jessekaiser | 45:f5d74c7f8fbf | 23 | |
jessekaiser | 45:f5d74c7f8fbf | 24 | //Microstepping |
jessekaiser | 0:3acdd563582f | 25 | DigitalOut MS1(p27); |
jessekaiser | 0:3acdd563582f | 26 | DigitalOut MS2(p28); |
jessekaiser | 0:3acdd563582f | 27 | DigitalOut MS3(p29); |
jessekaiser | 45:f5d74c7f8fbf | 28 | |
jessekaiser | 45:f5d74c7f8fbf | 29 | //Potmeter and EMG |
jessekaiser | 10:7f94cd65c910 | 30 | AnalogIn Pot1(p19); |
jessekaiser | 31:372ff8d49430 | 31 | AnalogIn Pot2(p20); |
jessekaiser | 45:f5d74c7f8fbf | 32 | |
jessekaiser | 45:f5d74c7f8fbf | 33 | AnalogIn emg1(p17); //EMG bordje bovenop, biceps |
jessekaiser | 45:f5d74c7f8fbf | 34 | AnalogIn emg2(p15); //triceps |
jessekaiser | 45:f5d74c7f8fbf | 35 | HIDScope scope(2); |
jessekaiser | 45:f5d74c7f8fbf | 36 | Ticker scopeTimer; |
jessekaiser | 45:f5d74c7f8fbf | 37 | |
jessekaiser | 45:f5d74c7f8fbf | 38 | //lcd |
jessekaiser | 30:0a8f849e0292 | 39 | C12832_LCD lcd; |
jessekaiser | 0:3acdd563582f | 40 | |
jessekaiser | 45:f5d74c7f8fbf | 41 | //Variables for motor control |
jessekaiser | 45:f5d74c7f8fbf | 42 | float setpoint = 4400; //Frequentie setpint |
jessekaiser | 45:f5d74c7f8fbf | 43 | float step_freq1 = 1; |
jessekaiser | 45:f5d74c7f8fbf | 44 | float step_freq2 = 1; |
jessekaiser | 45:f5d74c7f8fbf | 45 | |
jessekaiser | 45:f5d74c7f8fbf | 46 | //EMG filter |
jessekaiser | 45:f5d74c7f8fbf | 47 | arm_biquad_casd_df1_inst_f32 lowpass_biceps; |
jessekaiser | 45:f5d74c7f8fbf | 48 | arm_biquad_casd_df1_inst_f32 lowpass_triceps; |
jessekaiser | 45:f5d74c7f8fbf | 49 | //lowpass filter settings: Fc = 2 Hz, Fs = 500 Hz, Gain = -3 dB |
jessekaiser | 45:f5d74c7f8fbf | 50 | float lowpass_const[] = {0.00015514839749793376, 0.00031029679499586753, 0.00015514839749793376, 1.9644602512795832, -0.9650808448695751}; |
jessekaiser | 45:f5d74c7f8fbf | 51 | arm_biquad_casd_df1_inst_f32 highnotch_biceps; |
jessekaiser | 45:f5d74c7f8fbf | 52 | arm_biquad_casd_df1_inst_f32 highnotch_triceps; |
jessekaiser | 45:f5d74c7f8fbf | 53 | //highpass filter settings: Fc = 20 Hz, Fs = 500 Hz, notch Fc = 50, Fs = 500 Hz |
jessekaiser | 45:f5d74c7f8fbf | 54 | float highnotch_const[] = {0.8370879899975344, -1.6741759799950688, 0.8370879899975344, 1.6474576182593796, -0.7008943417307579, 0.7063988100714527, -1.1429772843080923, 0.7063988100714527, 1.1429772843080923, -0.41279762014290533}; |
jessekaiser | 45:f5d74c7f8fbf | 55 | |
jessekaiser | 45:f5d74c7f8fbf | 56 | //state values |
jessekaiser | 45:f5d74c7f8fbf | 57 | float lowpass_biceps_states[4]; |
jessekaiser | 45:f5d74c7f8fbf | 58 | float highnotch_biceps_states[8]; |
jessekaiser | 45:f5d74c7f8fbf | 59 | float lowpass_triceps_states[4]; |
jessekaiser | 45:f5d74c7f8fbf | 60 | float highnotch_triceps_states[8]; |
jessekaiser | 45:f5d74c7f8fbf | 61 | |
jessekaiser | 45:f5d74c7f8fbf | 62 | //global variabels |
jessekaiser | 45:f5d74c7f8fbf | 63 | float filtered_biceps; |
jessekaiser | 45:f5d74c7f8fbf | 64 | float filtered_triceps; |
jessekaiser | 45:f5d74c7f8fbf | 65 | float speed_old1; |
jessekaiser | 45:f5d74c7f8fbf | 66 | float speed_old2; |
jessekaiser | 45:f5d74c7f8fbf | 67 | float acc1; |
jessekaiser | 45:f5d74c7f8fbf | 68 | float acc2; |
jessekaiser | 45:f5d74c7f8fbf | 69 | float force1; |
jessekaiser | 45:f5d74c7f8fbf | 70 | float force2; |
jessekaiser | 45:f5d74c7f8fbf | 71 | float speed1; |
jessekaiser | 45:f5d74c7f8fbf | 72 | float speed2; |
jessekaiser | 45:f5d74c7f8fbf | 73 | float damping1; |
jessekaiser | 45:f5d74c7f8fbf | 74 | float damping2; |
jessekaiser | 45:f5d74c7f8fbf | 75 | |
jessekaiser | 45:f5d74c7f8fbf | 76 | void looper_emg() |
jessekaiser | 45:f5d74c7f8fbf | 77 | { |
jessekaiser | 45:f5d74c7f8fbf | 78 | |
jessekaiser | 45:f5d74c7f8fbf | 79 | |
jessekaiser | 45:f5d74c7f8fbf | 80 | float emg_value1_f32; |
jessekaiser | 45:f5d74c7f8fbf | 81 | emg_value1_f32 = emg1.read(); |
jessekaiser | 45:f5d74c7f8fbf | 82 | |
jessekaiser | 45:f5d74c7f8fbf | 83 | float emg_value2_f32; |
jessekaiser | 45:f5d74c7f8fbf | 84 | emg_value2_f32 = emg2.read(); |
jessekaiser | 45:f5d74c7f8fbf | 85 | |
jessekaiser | 45:f5d74c7f8fbf | 86 | //process emg biceps |
jessekaiser | 45:f5d74c7f8fbf | 87 | arm_biquad_cascade_df1_f32(&highnotch_biceps, &emg_value1_f32, &filtered_biceps, 1 ); |
jessekaiser | 45:f5d74c7f8fbf | 88 | filtered_biceps = fabs(filtered_biceps); |
jessekaiser | 45:f5d74c7f8fbf | 89 | arm_biquad_cascade_df1_f32(&lowpass_biceps, &filtered_biceps, &filtered_biceps, 1 ); |
jessekaiser | 45:f5d74c7f8fbf | 90 | |
jessekaiser | 45:f5d74c7f8fbf | 91 | //process emg triceps |
jessekaiser | 45:f5d74c7f8fbf | 92 | arm_biquad_cascade_df1_f32(&highnotch_triceps, &emg_value2_f32, &filtered_triceps, 1 ); |
jessekaiser | 45:f5d74c7f8fbf | 93 | filtered_triceps = fabs(filtered_triceps); |
jessekaiser | 45:f5d74c7f8fbf | 94 | arm_biquad_cascade_df1_f32(&lowpass_triceps, &filtered_triceps, &filtered_triceps, 1 ); |
jessekaiser | 45:f5d74c7f8fbf | 95 | |
jessekaiser | 45:f5d74c7f8fbf | 96 | /*send value to PC. */ |
jessekaiser | 45:f5d74c7f8fbf | 97 | scope.set(0,filtered_biceps); //Filtered EMG signal |
jessekaiser | 45:f5d74c7f8fbf | 98 | scope.set(1,filtered_triceps); |
jessekaiser | 45:f5d74c7f8fbf | 99 | } |
jessekaiser | 45:f5d74c7f8fbf | 100 | |
jessekaiser | 45:f5d74c7f8fbf | 101 | void looper_motor() |
jessekaiser | 45:f5d74c7f8fbf | 102 | { |
jessekaiser | 45:f5d74c7f8fbf | 103 | //Vooruit |
jessekaiser | 45:f5d74c7f8fbf | 104 | force1 = K_Gain*(filtered_biceps/MAX_bi); |
jessekaiser | 45:f5d74c7f8fbf | 105 | force1 = force1 - damping1; |
jessekaiser | 45:f5d74c7f8fbf | 106 | acc1 = force1/Mass; |
jessekaiser | 45:f5d74c7f8fbf | 107 | speed1 = speed_old1 + (acc1 * dt); |
jessekaiser | 45:f5d74c7f8fbf | 108 | damping1 = speed1 * Damp; |
jessekaiser | 45:f5d74c7f8fbf | 109 | step_freq1 = (setpoint*speed1); |
jessekaiser | 45:f5d74c7f8fbf | 110 | speed_old1 = speed1; |
jessekaiser | 45:f5d74c7f8fbf | 111 | |
jessekaiser | 45:f5d74c7f8fbf | 112 | //Achteruit triceps |
jessekaiser | 45:f5d74c7f8fbf | 113 | force2 = K_Gain*(filtered_triceps/MAX_tri); |
jessekaiser | 45:f5d74c7f8fbf | 114 | force2 = force2 - damping2; |
jessekaiser | 45:f5d74c7f8fbf | 115 | acc2 = force2/Mass; |
jessekaiser | 45:f5d74c7f8fbf | 116 | speed2 = speed_old2 + (acc2 * dt); |
jessekaiser | 45:f5d74c7f8fbf | 117 | damping2 = speed2 * Damp; |
jessekaiser | 45:f5d74c7f8fbf | 118 | step_freq2 = (setpoint*speed2); |
jessekaiser | 45:f5d74c7f8fbf | 119 | speed_old2 = speed2; |
jessekaiser | 45:f5d74c7f8fbf | 120 | if (filtered_biceps > filtered_triceps) { |
jessekaiser | 45:f5d74c7f8fbf | 121 | Dir = 0; |
jessekaiser | 45:f5d74c7f8fbf | 122 | speed2 = 0.01; |
jessekaiser | 45:f5d74c7f8fbf | 123 | speed_old2 = 0.01; |
jessekaiser | 45:f5d74c7f8fbf | 124 | Step.period(1.0/step_freq1); |
jessekaiser | 45:f5d74c7f8fbf | 125 | } if (filtered_triceps > filtered_biceps) { |
jessekaiser | 45:f5d74c7f8fbf | 126 | Dir = 1; |
jessekaiser | 45:f5d74c7f8fbf | 127 | speed1 = 0.01; |
jessekaiser | 45:f5d74c7f8fbf | 128 | speed_old1 = 0.01; |
jessekaiser | 45:f5d74c7f8fbf | 129 | Step.period(1.0/step_freq2); |
jessekaiser | 45:f5d74c7f8fbf | 130 | } |
jessekaiser | 45:f5d74c7f8fbf | 131 | //Speed limit |
jessekaiser | 45:f5d74c7f8fbf | 132 | if (speed1 > 1) { |
jessekaiser | 45:f5d74c7f8fbf | 133 | speed1 = 1; |
jessekaiser | 45:f5d74c7f8fbf | 134 | step_freq1 = setpoint; |
jessekaiser | 45:f5d74c7f8fbf | 135 | } |
jessekaiser | 45:f5d74c7f8fbf | 136 | if (speed2 > 1) { |
jessekaiser | 45:f5d74c7f8fbf | 137 | speed2 = 1; |
jessekaiser | 45:f5d74c7f8fbf | 138 | step_freq2 = setpoint; |
jessekaiser | 45:f5d74c7f8fbf | 139 | } |
jessekaiser | 45:f5d74c7f8fbf | 140 | //EMG treshold |
jessekaiser | 45:f5d74c7f8fbf | 141 | if (filtered_biceps < EMG_tresh && filtered_triceps < EMG_tresh) { |
jessekaiser | 45:f5d74c7f8fbf | 142 | Enable = 1; //Enable = 1 turns the motor off. |
jessekaiser | 45:f5d74c7f8fbf | 143 | speed1 = 0.01; |
jessekaiser | 45:f5d74c7f8fbf | 144 | speed_old1 = 0.01; |
jessekaiser | 45:f5d74c7f8fbf | 145 | speed2 = 0.01; |
jessekaiser | 45:f5d74c7f8fbf | 146 | speed_old2 = 0.01; |
jessekaiser | 45:f5d74c7f8fbf | 147 | } else { |
jessekaiser | 45:f5d74c7f8fbf | 148 | Enable = 0; |
jessekaiser | 45:f5d74c7f8fbf | 149 | } |
jessekaiser | 45:f5d74c7f8fbf | 150 | |
jessekaiser | 45:f5d74c7f8fbf | 151 | } |
jessekaiser | 45:f5d74c7f8fbf | 152 | |
jessekaiser | 41:a666a531d52e | 153 | int main() |
jessekaiser | 41:a666a531d52e | 154 | { |
jessekaiser | 45:f5d74c7f8fbf | 155 | // Attach the HIDScope::send method from the scope object to the timer at 500Hz. Hier wordt de sample freq aangegeven. |
jessekaiser | 45:f5d74c7f8fbf | 156 | scopeTimer.attach_us(&scope, &HIDScope::send, 2e3); |
jessekaiser | 45:f5d74c7f8fbf | 157 | |
jessekaiser | 45:f5d74c7f8fbf | 158 | Ticker emgtimer; |
jessekaiser | 45:f5d74c7f8fbf | 159 | arm_biquad_cascade_df1_init_f32(&lowpass_biceps, 1 , lowpass_const, lowpass_biceps_states); |
jessekaiser | 45:f5d74c7f8fbf | 160 | arm_biquad_cascade_df1_init_f32(&highnotch_biceps, 2 , highnotch_const, highnotch_biceps_states); |
jessekaiser | 45:f5d74c7f8fbf | 161 | arm_biquad_cascade_df1_init_f32(&lowpass_triceps, 1 , lowpass_const, lowpass_triceps_states); |
jessekaiser | 45:f5d74c7f8fbf | 162 | arm_biquad_cascade_df1_init_f32(&highnotch_triceps, 2 , highnotch_const, highnotch_triceps_states); |
jessekaiser | 45:f5d74c7f8fbf | 163 | emgtimer.attach(looper_emg, 0.002); |
jessekaiser | 45:f5d74c7f8fbf | 164 | |
jessekaiser | 45:f5d74c7f8fbf | 165 | Ticker looptimer; |
jessekaiser | 45:f5d74c7f8fbf | 166 | looptimer.attach(looper_motor, 0.01); //Uitzoeken waarom deze frequentie! |
jessekaiser | 45:f5d74c7f8fbf | 167 | |
jessekaiser | 45:f5d74c7f8fbf | 168 | //Microstepping control |
jessekaiser | 44:d5aa53e4778c | 169 | MS1 = 1; |
jessekaiser | 45:f5d74c7f8fbf | 170 | MS2 = 0; |
jessekaiser | 44:d5aa53e4778c | 171 | MS3 = 0; |
jessekaiser | 44:d5aa53e4778c | 172 | Step.write(0.5); // Duty cycle van 50% |
jessekaiser | 45:f5d74c7f8fbf | 173 | |
jessekaiser | 44:d5aa53e4778c | 174 | while (1) { |
jessekaiser | 23:4d050e85e863 | 175 | |
jessekaiser | 45:f5d74c7f8fbf | 176 | //lcd.printf("Bi %.2f ,Tri %.2f \n", filtered_biceps, filtered_triceps); //snelheid meting op lcd |
jessekaiser | 45:f5d74c7f8fbf | 177 | lcd.printf("1 %.0f, 2 %.0f \n", step_freq1, step_freq2); |
jessekaiser | 45:f5d74c7f8fbf | 178 | wait(0.01); |
jessekaiser | 0:3acdd563582f | 179 | } |
jessekaiser | 45:f5d74c7f8fbf | 180 | } |