Control up to two motors using filtered EMG signals and a PID controller
Dependencies: FastPWM HIDScope MODSERIAL QEI Matrix biquadFilter controller errorFetch mbed motorConfig refGen MatrixMath inverseKinematics
Fork of Minor_test_serial by
Diff: main.cpp
- Revision:
- 26:4f84448b4d46
- Parent:
- 25:df780572cfc8
- Child:
- 27:a4228ea8fb8f
--- a/main.cpp Fri Oct 06 12:37:54 2017 +0000 +++ b/main.cpp Fri Oct 06 13:11:24 2017 +0000 @@ -75,16 +75,20 @@ pc.printf("%0.2f revolutions \r\n", motor1Position); e_pos = getReferencePosition() - motor1Position; e_int = e_int + Ts*e_pos; - e_der = e_der - e_prev; - e = e_pos + e_int; + e_der = (e_pos - e_prev)/Ts; + e = e_pos + e_int + e_der; // not sure if this is really even all that useful + e_prev = e_pos; // Store current error as we'll need it to compute the next derivative error pc.printf("Error is %0.2f \r \n", e); } +const float k_p = 0.1; // use potmeter 2 to adjust k_p within range 0 to 1 +const float k_i = 0.05; // Still needs a reasonable value +const float k_d = 0.01; // Again, still need to pick a reasonable value + // motorController sets a motorValue based on the position error. Sign indicates direction and magnitude indicates speed. Right now this is a simple feedforward -float motorController(float e_pos, float e_int){ - float k_p = 5*pot2.read(); // use potmeter 2 to adjust k_p within range 0 to 1 - float k_i = 0.001; // How do I pick a reasonable value for k_i? - double motorValue = (e_pos*k_p)/maxAngle + 0.35 + k_i*e_int; // motorValue is the normalized voltage applied to motor magnitude pin between -1 and 1 added 0.35 as motorvalue of 0.35 does nothing +float motorController(float e_pos, float e_int, float e_der){ + // NOTE: do I still need the maxangle bit here? + double motorValue = (e_pos*k_p) + 0.35 + k_i*e_int + k_d*e_der; // motorValue is the normalized voltage applied to motor magnitude pin between -1 and 1 added 0.35 as motorvalue of 0.35 does nothing return motorValue; } @@ -120,13 +124,14 @@ } void measureAndControl(){ - getError(e_pos, e_int); - float motorValue = motorController(e_pos, e_int); - pc.printf("Position error is %.2f \r \n", e_pos); - pc.printf("Total error is %.2f \r \n", e); - pc.printf("Integral error is %2f", e_int); - //pc.printf("Motorvalue is %.2f \r \n", motorValue); - //pc.printf("Motor direction is %d \r \n", motor1_direction); + getError(e_pos, e_int, e_der); + float motorValue = motorController(e_pos, e_int, e_der); + pc.printf("Position action is %.2f \r \n", k_p*e_pos); + pc.printf("Derivative action is %.2f \r \n", k_d*e_der); + pc.printf("Integral action is %.2f", k_i*e_int); + pc.printf("Total action is %.2f", k_p*e_pos + k_d*e_der + k_i*e_int); + pc.printf("Motorvalue is %.2f \r \n", motorValue); + pc.printf("Actual error is %.2f \r \n", e_pos); setMotor1(motorValue); }