control for robotic arm that can play chess using a granular gripper
Dependencies: Encoder mbed HIDScope Servo MODSERIAL
Fork of chessRobot by
actuators.cpp
- Committer:
- annesteenbeek
- Date:
- 2015-10-05
- Revision:
- 20:3cba803cd771
- Parent:
- 19:e89eae07dece
- Child:
- 21:3e6ebec86438
File content as of revision 20:3cba803cd771:
#include "actuators.h" #include "PID.h" #include "mbed.h" #include "config.h" #include "encoder.h" // functions for controlling the motors bool motorEnable = false; bool direction1 = false; // CCW is false(positive rotation), CW is true (neg rotation) bool direction2 = false; float motor1Pos = 0; float motor2Pos = 0; float motorSpeed1 = 0; float motorSpeed2 = 0; float motorSetSpeed1 = 0; float motorSetSpeed2 = 0; float motorPWM1 = 0; float motorPWM2 = 0; // Set PID values float Kp1 = 1; float Ki1 = 1; float Kd1 = 1; float Kp2 = 1; float Ki2 = 1; float Kd2 = 1; float PIDinterval = 0.2; void motorInit(){ // Initialze motors PwmOut motor1(motor1PWMPin); PwmOut motor2(motor2PWMPin); // Set motor direction pins. DigitalOut motor1Dir(motor1DirPin); DigitalOut motor2Dir(motor2DirPin); // Set initial direction motor1Dir.write(direction1); motor2Dir.write(direction2); // Set motor PWM period motor1.period(1/pwm_frequency); motor2.period(1/pwm_frequency); // Initialize encoders (with speed calculation) Encoder encoder1(enc1A, enc1B, true); Encoder encoder2(enc2A, enc2B, true); initPID(); } void initPID(){ // create PID instances for motors // PID pidname(input, output, setpoint, kp, ki, kd, direction) PID PIDmotor1(Kp1, Ki1, Kd1, PIDinterval); PID PIDmotor2(Kp2, Ki2, Kd2, PIDinterval); PIDmotor1.setSetPoint(motorSetSpeed1); PIDmotor2.setSetPoint(motorSetSpeed2); PIDmotor1.setProcessValue(motorSpeed1); PIDmotor2.setProcessValue(motorSpeed2); // set PID mode PIDmotor1.setMode(AUTOMATIC); PIDmotor2.setMode(AUTOMATIC); // set limits for PID output to avoid integrator build up. PIDmotor1.SetOutputLimits(-1.0, 1.0); PIDmotor2.SetOutputLimits(-1.0, 1.0); } void motorControl(){ if(motorEnable){ // only run motors if switch is enabled // get encoder positions motor1Pos = encoder1.getPosition(); motor2Pos = encoder2.getPosition(); // check if motor's are within rotational boundarys // get encoder speeds motorSpeed1 = encoder1.getSpeed(); motorSpeed2 = encoder2.getSpeed(); // translate to x/y speed // compute new PID parameters using setpoint speeds and x/y speeds motorPWM1 = PIDmotor1.compute(); motorPWM2 = PIDmotor2.compute(); // translate to motor rotation speed // write new values to motor's if (motorPWM1 > 0 ){ // CCW rotation (unitcircle convetion) direction1 = false; }else{ direction1 = true; // CW rotation } if (motorPWM2 > 0 ){ // CCW rotation (unitcircle convetion) direction2 = false; }else{ direction2 = true; // CW rotation } motor1.write(abs(motorPWM1)); motor2.write(abs(motorPWM2)); }else{ // write 0 to motors motor1.write(0); motor2.write(0); } } void servoControl(){ // use potMeter Value to set servo angle // (optionaly calculate xy position to keep balloon in position) // calculate z position using angle // calculate x y translation of endpoint // find new x and y speed. }