![](/media/cache/img/default_profile.jpg.50x50_q85.jpg)
4 directional EMG control of the XY table. Made during my bachelor end assignment.
Dependencies: C12832_lcd HIDScope mbed-dsp mbed
main.cpp@40:0cfd96cb25fa, 2015-06-03 (annotated)
- Committer:
- jessekaiser
- Date:
- Wed Jun 03 13:10:34 2015 +0000
- Revision:
- 40:0cfd96cb25fa
- Parent:
- 39:191ae0d12bd6
- Child:
- 41:a666a531d52e
Motor besturen 2 emg signalen met 1 snelheid;
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 | 23:4d050e85e863 | 3 | #include "arm_math.h" |
jessekaiser | 23:4d050e85e863 | 4 | #include "HIDScope.h" |
jessekaiser | 0:3acdd563582f | 5 | |
jessekaiser | 40:0cfd96cb25fa | 6 | #define K_Gain 14 //Gain of the filtered EMG signal |
jessekaiser | 40:0cfd96cb25fa | 7 | #define Damp 5 //Deceleration of the motor |
jessekaiser | 34:025b324d15d6 | 8 | #define Mass 1 // Mass value |
jessekaiser | 34:025b324d15d6 | 9 | #define dt 0.002 //Sample frequency |
jessekaiser | 40:0cfd96cb25fa | 10 | #define MAX_bi 0.09 //Can be used for normalisation of the EMG signal of the biceps |
jessekaiser | 40:0cfd96cb25fa | 11 | #define MAX_tri 0.09 |
jessekaiser | 40:0cfd96cb25fa | 12 | #define MIN_freq 500 //The motor turns off below this frequency |
jessekaiser | 31:372ff8d49430 | 13 | |
jessekaiser | 23:4d050e85e863 | 14 | //Motor control |
jessekaiser | 0:3acdd563582f | 15 | DigitalOut Dir(p21); |
jessekaiser | 0:3acdd563582f | 16 | PwmOut Step(p22); |
jessekaiser | 23:4d050e85e863 | 17 | |
jessekaiser | 23:4d050e85e863 | 18 | //Signal to and from computer |
jessekaiser | 23:4d050e85e863 | 19 | Serial pc(USBTX, USBRX); |
jessekaiser | 23:4d050e85e863 | 20 | |
jessekaiser | 24:c4c5d30a3938 | 21 | DigitalOut Enable(p25); |
jessekaiser | 23:4d050e85e863 | 22 | |
jessekaiser | 23:4d050e85e863 | 23 | //Microstepping |
jessekaiser | 0:3acdd563582f | 24 | DigitalOut MS1(p27); |
jessekaiser | 0:3acdd563582f | 25 | DigitalOut MS2(p28); |
jessekaiser | 0:3acdd563582f | 26 | DigitalOut MS3(p29); |
jessekaiser | 23:4d050e85e863 | 27 | |
jessekaiser | 23:4d050e85e863 | 28 | //Potmeter and EMG |
jessekaiser | 10:7f94cd65c910 | 29 | AnalogIn Pot1(p19); |
jessekaiser | 31:372ff8d49430 | 30 | AnalogIn Pot2(p20); |
jessekaiser | 38:c592354f5080 | 31 | |
jessekaiser | 38:c592354f5080 | 32 | AnalogIn emg1(p17); //EMG bordje bovenop, biceps |
jessekaiser | 38:c592354f5080 | 33 | AnalogIn emg2(p15); //triceps |
jessekaiser | 38:c592354f5080 | 34 | HIDScope scope(2); |
jessekaiser | 29:83f005c637be | 35 | Ticker scopeTimer; |
jessekaiser | 25:144eb5822aa7 | 36 | |
jessekaiser | 23:4d050e85e863 | 37 | //lcd |
jessekaiser | 30:0a8f849e0292 | 38 | C12832_LCD lcd; |
jessekaiser | 0:3acdd563582f | 39 | |
jessekaiser | 23:4d050e85e863 | 40 | //Variables for motor control |
jessekaiser | 40:0cfd96cb25fa | 41 | float setpoint = 4400; //Frequentie setpint |
jessekaiser | 23:4d050e85e863 | 42 | float step_freq = 1; |
jessekaiser | 23:4d050e85e863 | 43 | |
jessekaiser | 23:4d050e85e863 | 44 | //EMG filter |
jessekaiser | 23:4d050e85e863 | 45 | arm_biquad_casd_df1_inst_f32 lowpass_biceps; |
jessekaiser | 38:c592354f5080 | 46 | arm_biquad_casd_df1_inst_f32 lowpass_triceps; |
jessekaiser | 38:c592354f5080 | 47 | //lowpass filter settings: Fc = 2 Hz, Fs = 500 Hz, Gain = -3 dB |
jessekaiser | 34:025b324d15d6 | 48 | float lowpass_const[] = {0.00015514839749793376, 0.00031029679499586753, 0.00015514839749793376, 1.9644602512795832, -0.9650808448695751}; |
jessekaiser | 23:4d050e85e863 | 49 | arm_biquad_casd_df1_inst_f32 highnotch_biceps; |
jessekaiser | 38:c592354f5080 | 50 | arm_biquad_casd_df1_inst_f32 highnotch_triceps; |
jessekaiser | 35:b0737ee24b43 | 51 | //highpass filter settings: Fc = 20 Hz, Fs = 500 Hz, notch Fc = 50, Fs = 500 Hz |
jessekaiser | 31:372ff8d49430 | 52 | float highnotch_const[] = {0.8370879899975344, -1.6741759799950688, 0.8370879899975344, 1.6474576182593796, -0.7008943417307579, 0.7063988100714527, -1.1429772843080923, 0.7063988100714527, 1.1429772843080923, -0.41279762014290533}; |
jessekaiser | 23:4d050e85e863 | 53 | |
jessekaiser | 23:4d050e85e863 | 54 | //state values |
jessekaiser | 23:4d050e85e863 | 55 | float lowpass_biceps_states[4]; |
jessekaiser | 23:4d050e85e863 | 56 | float highnotch_biceps_states[8]; |
jessekaiser | 38:c592354f5080 | 57 | float lowpass_triceps_states[4]; |
jessekaiser | 38:c592354f5080 | 58 | float highnotch_triceps_states[8]; |
jessekaiser | 23:4d050e85e863 | 59 | |
jessekaiser | 23:4d050e85e863 | 60 | //global variabels |
jessekaiser | 23:4d050e85e863 | 61 | float filtered_biceps; |
jessekaiser | 38:c592354f5080 | 62 | float filtered_triceps; |
jessekaiser | 40:0cfd96cb25fa | 63 | float speed_old; |
jessekaiser | 31:372ff8d49430 | 64 | float acc; |
jessekaiser | 38:c592354f5080 | 65 | float force1; |
jessekaiser | 38:c592354f5080 | 66 | float force2; |
jessekaiser | 40:0cfd96cb25fa | 67 | float speed; |
jessekaiser | 32:46b18f465600 | 68 | float D; |
jessekaiser | 32:46b18f465600 | 69 | |
jessekaiser | 23:4d050e85e863 | 70 | void looper_emg() |
jessekaiser | 23:4d050e85e863 | 71 | { |
jessekaiser | 36:d6e0a835bb2d | 72 | |
jessekaiser | 23:4d050e85e863 | 73 | |
jessekaiser | 23:4d050e85e863 | 74 | float emg_value1_f32; |
jessekaiser | 38:c592354f5080 | 75 | emg_value1_f32 = emg1.read(); |
jessekaiser | 38:c592354f5080 | 76 | |
jessekaiser | 38:c592354f5080 | 77 | float emg_value2_f32; |
jessekaiser | 38:c592354f5080 | 78 | emg_value2_f32 = emg2.read(); |
jessekaiser | 23:4d050e85e863 | 79 | |
jessekaiser | 23:4d050e85e863 | 80 | //process emg biceps |
jessekaiser | 23:4d050e85e863 | 81 | arm_biquad_cascade_df1_f32(&highnotch_biceps, &emg_value1_f32, &filtered_biceps, 1 ); |
jessekaiser | 31:372ff8d49430 | 82 | filtered_biceps = fabs(filtered_biceps); |
jessekaiser | 23:4d050e85e863 | 83 | arm_biquad_cascade_df1_f32(&lowpass_biceps, &filtered_biceps, &filtered_biceps, 1 ); |
jessekaiser | 36:d6e0a835bb2d | 84 | |
jessekaiser | 38:c592354f5080 | 85 | //process emg triceps |
jessekaiser | 38:c592354f5080 | 86 | arm_biquad_cascade_df1_f32(&highnotch_triceps, &emg_value2_f32, &filtered_triceps, 1 ); |
jessekaiser | 38:c592354f5080 | 87 | filtered_triceps = fabs(filtered_triceps); |
jessekaiser | 38:c592354f5080 | 88 | arm_biquad_cascade_df1_f32(&lowpass_triceps, &filtered_triceps, &filtered_triceps, 1 ); |
jessekaiser | 23:4d050e85e863 | 89 | |
jessekaiser | 23:4d050e85e863 | 90 | /*send value to PC. */ |
jessekaiser | 36:d6e0a835bb2d | 91 | scope.set(0,filtered_biceps); //Filtered EMG signal |
jessekaiser | 38:c592354f5080 | 92 | scope.set(1,filtered_triceps); |
jessekaiser | 23:4d050e85e863 | 93 | } |
jessekaiser | 26:b88ff19ff5dc | 94 | |
jessekaiser | 31:372ff8d49430 | 95 | void looper_motor() |
jessekaiser | 31:372ff8d49430 | 96 | { |
jessekaiser | 38:c592354f5080 | 97 | |
jessekaiser | 38:c592354f5080 | 98 | if (filtered_biceps > filtered_triceps) { |
jessekaiser | 38:c592354f5080 | 99 | Dir = 0; |
jessekaiser | 40:0cfd96cb25fa | 100 | force2 = 0; |
jessekaiser | 38:c592354f5080 | 101 | force1 = K_Gain*(filtered_biceps/MAX_bi); |
jessekaiser | 38:c592354f5080 | 102 | force1 = force1 - D; |
jessekaiser | 38:c592354f5080 | 103 | acc = force1/Mass; |
jessekaiser | 40:0cfd96cb25fa | 104 | speed = speed_old + (acc * dt); |
jessekaiser | 40:0cfd96cb25fa | 105 | D = speed * Damp; |
jessekaiser | 40:0cfd96cb25fa | 106 | |
jessekaiser | 38:c592354f5080 | 107 | } else { |
jessekaiser | 38:c592354f5080 | 108 | Dir = 1; |
jessekaiser | 40:0cfd96cb25fa | 109 | force1 = 0; |
jessekaiser | 38:c592354f5080 | 110 | force2 = K_Gain*(filtered_triceps/MAX_tri); |
jessekaiser | 38:c592354f5080 | 111 | force2 = force2 - D; |
jessekaiser | 38:c592354f5080 | 112 | acc = force2/Mass; |
jessekaiser | 40:0cfd96cb25fa | 113 | speed = speed_old + (acc * dt); |
jessekaiser | 40:0cfd96cb25fa | 114 | D = speed * Damp; |
jessekaiser | 37:3b9b18450612 | 115 | } |
jessekaiser | 38:c592354f5080 | 116 | //Speed limit |
jessekaiser | 40:0cfd96cb25fa | 117 | if (speed > 1) { |
jessekaiser | 38:c592354f5080 | 118 | speed = 1; |
jessekaiser | 38:c592354f5080 | 119 | step_freq = setpoint; |
jessekaiser | 38:c592354f5080 | 120 | } else { |
jessekaiser | 38:c592354f5080 | 121 | step_freq = (setpoint*speed); |
jessekaiser | 38:c592354f5080 | 122 | } |
jessekaiser | 40:0cfd96cb25fa | 123 | |
jessekaiser | 31:372ff8d49430 | 124 | |
jessekaiser | 40:0cfd96cb25fa | 125 | if (filtered_biceps < 0.02 && filtered_triceps < 0.02) { |
jessekaiser | 38:c592354f5080 | 126 | Enable = 1; |
jessekaiser | 38:c592354f5080 | 127 | } else { |
jessekaiser | 38:c592354f5080 | 128 | Enable = 0; |
jessekaiser | 38:c592354f5080 | 129 | } |
jessekaiser | 40:0cfd96cb25fa | 130 | Step.period(1.0/step_freq); |
jessekaiser | 40:0cfd96cb25fa | 131 | speed_old = speed; |
jessekaiser | 38:c592354f5080 | 132 | } |
jessekaiser | 31:372ff8d49430 | 133 | |
jessekaiser | 38:c592354f5080 | 134 | int main() { |
jessekaiser | 38:c592354f5080 | 135 | // Attach the HIDScope::send method from the scope object to the timer at 500Hz. Hier wordt de sample freq aangegeven. |
jessekaiser | 38:c592354f5080 | 136 | scopeTimer.attach_us(&scope, &HIDScope::send, 2e3); |
jessekaiser | 36:d6e0a835bb2d | 137 | |
jessekaiser | 38:c592354f5080 | 138 | Ticker emgtimer; |
jessekaiser | 38:c592354f5080 | 139 | arm_biquad_cascade_df1_init_f32(&lowpass_biceps, 1 , lowpass_const, lowpass_biceps_states); |
jessekaiser | 38:c592354f5080 | 140 | arm_biquad_cascade_df1_init_f32(&highnotch_biceps, 2 , highnotch_const, highnotch_biceps_states); |
jessekaiser | 38:c592354f5080 | 141 | arm_biquad_cascade_df1_init_f32(&lowpass_triceps, 1 , lowpass_const, lowpass_triceps_states); |
jessekaiser | 38:c592354f5080 | 142 | arm_biquad_cascade_df1_init_f32(&highnotch_triceps, 2 , highnotch_const, highnotch_triceps_states); |
jessekaiser | 38:c592354f5080 | 143 | emgtimer.attach(looper_emg, 0.002); |
jessekaiser | 38:c592354f5080 | 144 | |
jessekaiser | 38:c592354f5080 | 145 | Ticker looptimer; |
jessekaiser | 38:c592354f5080 | 146 | looptimer.attach(looper_motor, 0.01); //Uitzoeken waarom deze frequentie! |
jessekaiser | 23:4d050e85e863 | 147 | |
jessekaiser | 38:c592354f5080 | 148 | //Microstepping control |
jessekaiser | 38:c592354f5080 | 149 | MS1 = 1; |
jessekaiser | 38:c592354f5080 | 150 | MS2 = 0; |
jessekaiser | 38:c592354f5080 | 151 | MS3 = 0; |
jessekaiser | 38:c592354f5080 | 152 | Step.write(0.5); // Duty cycle van 50% |
jessekaiser | 23:4d050e85e863 | 153 | |
jessekaiser | 38:c592354f5080 | 154 | while (1) { |
jessekaiser | 38:c592354f5080 | 155 | |
jessekaiser | 40:0cfd96cb25fa | 156 | lcd.printf("Freq %.0f Hz, %.2f \n", step_freq, speed); //snelheid meting op lcd |
jessekaiser | 38:c592354f5080 | 157 | //pc.printf("%.3f \n", emg0.read()); |
jessekaiser | 38:c592354f5080 | 158 | wait(0.01); |
jessekaiser | 38:c592354f5080 | 159 | } |
jessekaiser | 0:3acdd563582f | 160 | } |