![](/media/cache/group/default_image.jpg.50x50_q85.jpg)
control for robotic arm that can play chess using a granular gripper
Dependencies: Encoder mbed HIDScope Servo MODSERIAL
Fork of chessRobot by
Diff: actuators.cpp
- Revision:
- 116:8b812e268b85
- Parent:
- 115:d8d2968981f3
- Child:
- 117:b1667291748d
diff -r d8d2968981f3 -r 8b812e268b85 actuators.cpp --- a/actuators.cpp Tue Oct 27 16:21:20 2015 +0100 +++ b/actuators.cpp Wed Oct 28 11:48:07 2015 +0100 @@ -54,12 +54,13 @@ const int servoStartPos = 1300; // Servo ranges from 600ms(-90) to 2000ms(90), 1300 is 0 deg // Set calibration values -double motorCalSpeed = 5; // deg/sec -double returnSpeed = -5; +double motor1CalSpeed = -5; // deg/sec +double motor2CalSpeed = 5; bool springHit = false; float lastCall = 0; bool calibrating1 = true; bool calibrating2 = false; +double looseTime = 0; // Create object instances // Safety Pin @@ -116,10 +117,10 @@ void motorControl(){ // EMG signals to motor speeds -// const double scaleVel = 20; -// motor1SetSpeed = x_velocity*scaleVel; -// motor2SetSpeed = y_velocity*scaleVel; -// servoSpeed = z_velocity*scaleVel; + // const double scaleVel = 20; + // motor1SetSpeed = x_velocity*scaleVel; + // motor2SetSpeed = y_velocity*scaleVel; + // servoSpeed = z_velocity*scaleVel; // get encoder positions in degrees // 131.25:1 gear ratio // getPosition uses X2 configuration, so 32 counts per revolution @@ -129,22 +130,26 @@ encoder2Counts = encoder2.getPosition(); - motor1Pos = -((encoder1Counts/32)/131.25)*360; - motor2Pos = -((encoder2Counts/32)/131.25)*360; + motor1Pos = ((encoder1Counts/32)/131.25)*360; + motor2Pos = ((encoder2Counts/32)/131.25)*360; // check if motor's are within rotational boundarys // get encoder speeds in deg/sec now = t.read(); timechange = (now - prevTime); - motor1Speed = -((((encoder1Counts - motor1PrevCounts)/32)/131.25)*360)/timechange; - motor2Speed = -((((encoder2Counts - motor2PrevCounts)/32)/131.25)*360)/timechange; + motor1Speed = ((((encoder1Counts - motor1PrevCounts)/32)/131.25)*360)/timechange; + motor2Speed = ((((encoder2Counts - motor2PrevCounts)/32)/131.25)*360)/timechange; prevTime = now; motor1PrevCounts = encoder1Counts; motor2PrevCounts = encoder2Counts; // calculate motor setpoint speed in deg/sec from setpoint x/y speed - + // exclude kinematics when still calibrating + if (calReady){ + kinematics(); + } + if(motorsEnable){ // only run motors if switch is enabled // compute new PID parameters using setpoint angle speeds and encoder speed writeMotors(); @@ -161,17 +166,17 @@ motor2PID.Compute(); // write new values to motor's if (motor1SetSpeed > 0 ){ // CCW rotation - direction1 = false; + direction1 = true; motor1PID.SetOutputLimits(0,1); // change pid output direction }else{ - direction1 = true; // CW rotation + direction1 = false; // CW rotation motor1PID.SetOutputLimits(-1,0); } if (motor2SetSpeed > 0 ){ // CCW rotation - direction2 = false; + direction2 = true; motor2PID.SetOutputLimits(0,1); }else{ - direction2 = true; // CW rotation + direction2 = false; // CW rotation motor2PID.SetOutputLimits(-1,0); } motor1Dir.write(direction1); @@ -185,21 +190,25 @@ servo.SetPosition(1300 + 700*servoSpeed); } +const double motor1StartPos = (-10*32*131.25)/360; // angle to encoder counts +const double motor2StartPos = (114*32*131.25)/360; + bool calibrateMotors(){ safetyOn = false; // safety springs off motorsEnable = true; // motors on - redLed.write(0); greenLed.write(1); blueLed.write(1); - if (calibrating1 || calibrating2){ + while (calibrating1 || calibrating2){ if (calibrating1){ - motor1SetSpeed = motorCalSpeed; + motor1SetSpeed = motor1CalSpeed; redLed.write(1); greenLed.write(0); blueLed.write(1); - if(safetyIn.read() !=1){ // check if arm reached safety position - encoder1.setPosition(0); // set motor 1 cal angle - motor1PrevCounts = 0; // set previous count to prevent speed spike - motor1SetSpeed = returnSpeed; // move away + if(safetyIn.read() !=1 && !springHit){ // check if arm reached safety position + encoder1.setPosition(motor1StartPos); // set motor 1 cal angle + motor1PrevCounts = motor1StartPos; // set previous count to prevent speed spike + motor1CalSpeed = -motor1CalSpeed; // move away springHit = true; + looseTime = t.read(); // timer to compensate spring movement }else{ - if(springHit){ // if hit and after is no longer touching spring + // if hit and after is no longer touching spring and 0.5seconds passed + if(springHit && ((t.read() - looseTime) > 2)){ motor1SetSpeed = 0; springHit = false; calibrating2 = true; // start calibrating 2 @@ -208,29 +217,31 @@ } } if (calibrating2){ - motor2SetSpeed = motorCalSpeed; + motor2SetSpeed = motor2CalSpeed; redLed.write(1); greenLed.write(1); blueLed.write(0); - if(safetyIn.read() !=1){ // check if arm reached safety position - encoder2.setPosition(0); // set motor 2 cal angle - motor2PrevCounts = 0; // set previous cunt to prevent speed spike - motor2SetSpeed = returnSpeed; // move away + if(safetyIn.read() !=1 && !springHit){ // check if arm reached safety position + encoder2.setPosition(motor2StartPos); // set motor 2 cal angle + motor2PrevCounts = motor2StartPos; // set previous cunt to prevent speed spike + motor2CalSpeed = -motor2CalSpeed; // move away springHit = true; + looseTime = t.read(); }else{ - if(springHit){ // if hit and after is no longer touching spring + if(springHit && ((t.read() - looseTime) > 2)){ motor2SetSpeed = 0; springHit = false; calibrating2 = false; // stop calibrating 2 } } } - now = t.read(); // call motor using timer instead of wait + // now = t.read(); // call motor using timer instead of wait // if(now - lastCall > motorCall){ motorControl(); - wait(motorCall); + wait(motorCall); // keep calling PID's with motorCall frequency // lastCall = now; // } } + redLed.write(0); greenLed.write(1); blueLed.write(1); motorsEnable = false; // turn motor's off again safetyOn = true; // turn safety on after callibration return true; // return true when finished @@ -245,31 +256,40 @@ } } +const double L1 = 0.436; // first arm in m +const double L2 = 0.120; // first arm in m +const double L3 = 0.255; // servo arm in m +const double Xmax = 0.3; +const double Xmin; = -0.3; +const double Ymax = 0.645; +const double Ymin = 0.33; -//bool kinematics(){ -// // calculate current x and Y -// X = L2*cos((motor1Pos + motor2Pos)*PI/180) + L1*cos(motor1Pos*PI/180); -// Y = L2*sin((motor1Pos + motor2Pos)*PI/180) + L1*sin(motor1Pos*PI/180); -// // check if x and y are within limits -// // else Store the constraint line -// // check if movement is in direction of constraint -// // else return false no movement (anglespeed = 0) -// // calculate required angle speeds -// if( (X>Xmax && setXSpeed > 0 )|| \ -// (X<Xmin && setXSpeed < 0 )|| \ -// (Y>Ymax && setYSpeed > 0 )|| \ -// (Y<Ymin && setYSpeed < 0 ) \ -// ){ -// motor1SetSpeed = 0; -// motor2SetSpeed = 0; -// return false; -// break; -// } -// motor1SetSpeed = (setXSpeed*cos((motor1Pos + motor2Pos)*PI/180) + \ -// setYSpeed*sin((motor1Pos + motor2Pos)*PI/180))/(L1*sin(motor2Pos*PI/180)); -// motor2SetSpeed = -(setXSpeed*L2*cos((motor1Pos + motor2Pos)*PI/180) + \ -// setYSpeed*L2*sin((motor1Pos + motor2Pos)*PI/180) + \ -// setXSpeed*L1*cos(motor1Pos*PI/180) + \ -// setYSpeed*L1*sin(motor1Pos*PI/180))/(L1*L2*sin(motor2Pos*PI/180)); + -//} \ No newline at end of file +bool kinematics(){ + // calculate current x and Y + double X = (L2+L3)*cos((motor1Pos + motor2Pos)*PI/180) + L1*cos(motor1Pos*PI/180); + double Y = (L2+L3)*sin((motor1Pos + motor2Pos)*PI/180) + L1*sin(motor1Pos*PI/180); + // check if x and y are within limits + // else Store the constraint line + // check if movement is in direction of constraint + // else return false no movement (anglespeed = 0) + // calculate required angle speeds + if( (X>Xmax && setXSpeed > 0 )|| \ + (X<Xmin && setXSpeed < 0 )|| \ + (Y>Ymax && setYSpeed > 0 )|| \ + (Y<Ymin && setYSpeed < 0 ) \ + ){ + motor1SetSpeed = 0; + motor2SetSpeed = 0; + return false; + break; + } +motor1SetSpeed = (setXSpeed*cos((motor1Pos + motor2Pos)*PI/180) + \ + setYSpeed*sin((motor1Pos + motor2Pos)*PI/180))/(L1*sin(motor2Pos*PI/180)); +motor2SetSpeed = -(setXSpeed*(L2+L3)*cos((motor1Pos + motor2Pos)*PI/180) + \ + setYSpeed*(L2+L3)*sin((motor1Pos + motor2Pos)*PI/180) + \ + setXSpeed*L1*cos(motor1Pos*PI/180) + \ + setYSpeed*L1*sin(motor1Pos*PI/180))/(L1*(L2+L3)*sin(motor2Pos*PI/180)); + +} \ No newline at end of file