diff --git a/2019robot/src/main/java/org/usfirst/frc4388/robot/Robot.java b/2019robot/src/main/java/org/usfirst/frc4388/robot/Robot.java index 1f3669c..c2c6a02 100644 --- a/2019robot/src/main/java/org/usfirst/frc4388/robot/Robot.java +++ b/2019robot/src/main/java/org/usfirst/frc4388/robot/Robot.java @@ -29,6 +29,7 @@ public class Robot extends IterativeRobot public static OI oi; public static final Drive drive = new Drive(); + public static final Arm arm = new Arm(); @@ -56,7 +57,8 @@ public class Robot extends IterativeRobot try { oi = OI.getInstance(); - controlLoop.addLoopable(drive); + controlLoop.addLoopable(drive); + controlLoop.addLoopable(arm); operationModeChooser = new SendableChooser(); diff --git a/2019robot/src/main/java/org/usfirst/frc4388/robot/RobotMap.java b/2019robot/src/main/java/org/usfirst/frc4388/robot/RobotMap.java index 3995e0b..8b8dff4 100644 --- a/2019robot/src/main/java/org/usfirst/frc4388/robot/RobotMap.java +++ b/2019robot/src/main/java/org/usfirst/frc4388/robot/RobotMap.java @@ -21,8 +21,8 @@ public class RobotMap { public static final int INTAKE_BELT_DRIVE_CAN_ID = 8; //Elevator Motors - public static final int ELEVATOR_MOTOR1_ID = 6; - public static final int ELEVATOR_MOTOR2_ID = 7; + public static final int ARM_MOTOR1_ID= 6; + public static final int ARM_MOTOR2_ID = 7; //Climber Motors diff --git a/2019robot/src/main/java/org/usfirst/frc4388/robot/commands/ArmAutoZero.java b/2019robot/src/main/java/org/usfirst/frc4388/robot/commands/ArmAutoZero.java new file mode 100644 index 0000000..7ba43a8 --- /dev/null +++ b/2019robot/src/main/java/org/usfirst/frc4388/robot/commands/ArmAutoZero.java @@ -0,0 +1,64 @@ +package org.usfirst.frc.team3310.robot.commands; + +import org.usfirst.frc.team3310.robot.Robot; +import org.usfirst.frc.team3310.robot.subsystems.Elevator; + +import edu.wpi.first.wpilibj.command.Command; + +public class ElevatorAutoZero extends Command +{ + private double MIN_ELEVATOR_POSITION_CHANGE = 0.05; + private double lastElevatorPosition; + private int encoderCount; + + public ElevatorAutoZero(boolean interrutible) { + requires(Robot.intake); + requires(Robot.elevator); + setInterruptible(interrutible); + } + + @Override + protected void initialize() { + lastElevatorPosition = Elevator.MAX_POSITION_INCHES; + Robot.elevator.setSpeed(Elevator.AUTO_ZERO_SPEED); + encoderCount = 0; +// System.out.println("Auto zero initialize"); + } + + @Override + protected void execute() { + + } + + @Override + protected boolean isFinished() { + Robot.elevator.setSpeed(Elevator.AUTO_ZERO_SPEED); + double currentElevatorPosition = Robot.elevator.getPositionInches(); + double elevatorPositionChange = lastElevatorPosition - currentElevatorPosition; + lastElevatorPosition = currentElevatorPosition; + boolean test = encoderCount > 2 && Math.abs(elevatorPositionChange) < MIN_ELEVATOR_POSITION_CHANGE && Robot.elevator.getAverageMotorCurrent() > Elevator.AUTO_ZERO_MOTOR_CURRENT; + System.out.println("encoderCount = " + encoderCount + ", test = " + test + ", elevator change = " + elevatorPositionChange + ", current = " + Robot.elevator.getAverageMotorCurrent()); + + if (Math.abs(elevatorPositionChange) < MIN_ELEVATOR_POSITION_CHANGE) { + encoderCount++; + } + else { + encoderCount = 0; + } + + return test; + } + + @Override + protected void end() { + Robot.elevator.setSpeed(0); + Robot.elevator.resetZeroPosition(Elevator.ZERO_POSITION_INCHES); + Robot.elevator.setPositionPID(Elevator.MIN_POSITION_INCHES); +// System.out.println("Elevator Zeroed"); + } + + @Override + protected void interrupted() { + + } +} \ No newline at end of file diff --git a/2019robot/src/main/java/org/usfirst/frc4388/robot/commands/ArmSetMode.java b/2019robot/src/main/java/org/usfirst/frc4388/robot/commands/ArmSetMode.java new file mode 100644 index 0000000..33b0c91 --- /dev/null +++ b/2019robot/src/main/java/org/usfirst/frc4388/robot/commands/ArmSetMode.java @@ -0,0 +1,50 @@ +package org.usfirst.frc.team3310.robot.commands; + +import org.usfirst.frc.team3310.robot.Robot; +import org.usfirst.frc.team3310.robot.subsystems.Elevator.ElevatorControlMode; + +import edu.wpi.first.wpilibj.command.Command; + +/** + * + */ +public class ElevatorSetMode extends Command { + + private ElevatorControlMode controlMode; + + public ElevatorSetMode(ElevatorControlMode controlMode) { + this.controlMode = controlMode; + requires(Robot.elevator); + } + + // Called just before this Command runs the first time + protected void initialize() { + if (controlMode == ElevatorControlMode.JOYSTICK_PID) { + Robot.elevator.setPositionPID(Robot.elevator.getPositionInches()); + } + else if (controlMode == ElevatorControlMode.JOYSTICK_MANUAL) { + Robot.elevator.setSpeedJoystick(0); + } + else { + Robot.elevator.setSpeed(0.0); + } + } + + // Called repeatedly when this Command is scheduled to run + protected void execute() { + } + + // Make this return true when this Command no longer needs to run execute() + protected boolean isFinished() { + return true; + } + + // Called once after isFinished returns true + protected void end() { + } + + // Called when another command which requires one or more of the same + // subsystems is scheduled to run + protected void interrupted() { + } +} diff --git a/2019robot/src/main/java/org/usfirst/frc4388/robot/commands/ArmSetPositionMP.java b/2019robot/src/main/java/org/usfirst/frc4388/robot/commands/ArmSetPositionMP.java new file mode 100644 index 0000000..baad693 --- /dev/null +++ b/2019robot/src/main/java/org/usfirst/frc4388/robot/commands/ArmSetPositionMP.java @@ -0,0 +1,55 @@ +package org.usfirst.frc4388.robot.commands; + +import org.usfirst.frc4388.robot.Robot; + +import edu.wpi.first.wpilibj.command.Command; + +/** + * + */ +public class ArmSetPositionMP extends Command { + + private double targetPositionInches; + private boolean isAtTarget; + private static final double MIN_DELTA_TARGET = 0.3; + + public ArmSetPositionMP(double targetPositionInches) { + this.targetPositionInches = targetPositionInches; + requires(Robot.arm); + } + + // Called just before this Command runs the first time + protected void initialize() { + if (Math.abs(targetPositionInches - Robot.arm.getPositionInches()) < MIN_DELTA_TARGET) { + isAtTarget = true; + } + else { + isAtTarget = false; + Robot.arm.setPositionMP(targetPositionInches); + } +// System.out.println("Arm set MP initialized, target = " + targetPositionInches); + } + + // Called repeatedly when this Command is scheduled to run + protected void execute() { + } + + // Make this return true when this Command no longer needs to run execute() + protected boolean isFinished() { + return isAtTarget || Robot.arm.isFinished(); + } + + // Called once after isFinished returns true + protected void end() { + Robot.arm.setPositionPID(Robot.arm.getPositionInches()); +// System.out.println("Arm set MP end"); + } + + // Called when another command which requires one or more of the same + // subsystems is scheduled to run + protected void interrupted() { +// System.out.println("ArmSetPositionMP interrupted"); + Robot.arm.setFinished(true); + Robot.arm.setPositionPID(Robot.arm.getPositionInches()); + } +} diff --git a/2019robot/src/main/java/org/usfirst/frc4388/robot/commands/ArmSetPositionPID.java b/2019robot/src/main/java/org/usfirst/frc4388/robot/commands/ArmSetPositionPID.java new file mode 100644 index 0000000..0156e34 --- /dev/null +++ b/2019robot/src/main/java/org/usfirst/frc4388/robot/commands/ArmSetPositionPID.java @@ -0,0 +1,42 @@ +package org.usfirst.frc4388.robot.commands; + +import org.usfirst.frc4388.robot.Robot; +import org.usfirst.frc4388.robot.subsystems.Arm; + +import edu.wpi.first.wpilibj.command.Command; + +/** + * + */ +public class ArmSetPositionPID extends Command { + + private double targetPositionInches; + + public ArmSetPositionPID(double targetPositionInches) { + this.targetPositionInches = targetPositionInches; + requires(Robot.arm); + } + + // Called just before this Command runs the first time + protected void initialize() { + Robot.arm.setPositionPID(targetPositionInches); + } + + // Called repeatedly when this Command is scheduled to run + protected void execute() { + } + + // Make this return true when this Command no longer needs to run execute() + protected boolean isFinished() { + return Math.abs(Robot.arm.getPositionInches() - this.targetPositionInches) < Arm.PID_ERROR_INCHES; + } + + // Called once after isFinished returns true + protected void end() { + } + + // Called when another command which requires one or more of the same + // subsystems is scheduled to run + protected void interrupted() { + } +} diff --git a/2019robot/src/main/java/org/usfirst/frc4388/robot/commands/ElevatorSetSpeed.java b/2019robot/src/main/java/org/usfirst/frc4388/robot/commands/ArmSetSpeed.java similarity index 100% rename from 2019robot/src/main/java/org/usfirst/frc4388/robot/commands/ElevatorSetSpeed.java rename to 2019robot/src/main/java/org/usfirst/frc4388/robot/commands/ArmSetSpeed.java diff --git a/2019robot/src/main/java/org/usfirst/frc4388/robot/commands/ArmSetZero.java b/2019robot/src/main/java/org/usfirst/frc4388/robot/commands/ArmSetZero.java new file mode 100644 index 0000000..8702c3c --- /dev/null +++ b/2019robot/src/main/java/org/usfirst/frc4388/robot/commands/ArmSetZero.java @@ -0,0 +1,40 @@ +package org.usfirst.frc4388.robot.commands; + +import org.usfirst.frc4388.robot.Robot; + +import edu.wpi.first.wpilibj.command.Command; + +public class ArmSetZero extends Command +{ + private double position; + + public ArmSetZero(double position) { + this.position = position; + requires(Robot.arm); + } + + @Override + protected void initialize() { + Robot.arm.resetZeroPosition(position); + } + + @Override + protected void execute() { + + } + + @Override + protected boolean isFinished() { + return true; + } + + @Override + protected void end() { + + } + + @Override + protected void interrupted() { + + } +} \ No newline at end of file diff --git a/2019robot/src/main/java/org/usfirst/frc4388/robot/subsystems/Arm.java b/2019robot/src/main/java/org/usfirst/frc4388/robot/subsystems/Arm.java new file mode 100644 index 0000000..ea270a7 --- /dev/null +++ b/2019robot/src/main/java/org/usfirst/frc4388/robot/subsystems/Arm.java @@ -0,0 +1,355 @@ +package org.usfirst.frc4388.robot.subsystems; +import java.util.ArrayList; + +import org.usfirst.frc4388.robot.Constants; +import org.usfirst.frc4388.robot.Robot; +import org.usfirst.frc4388.robot.RobotMap; +import org.usfirst.frc4388.utility.ControlLoopable; +import org.usfirst.frc4388.utility.Loop; +import org.usfirst.frc4388.utility.MPTalonPIDController; +import org.usfirst.frc4388.utility.PIDParams; +import org.usfirst.frc4388.utility.TalonSRXEncoder; +import org.usfirst.frc4388.utility.TalonSRXFactory; + +import com.ctre.phoenix.motorcontrol.ControlMode; +import com.ctre.phoenix.motorcontrol.FeedbackDevice; +import com.ctre.phoenix.motorcontrol.can.TalonSRX; +import com.ctre.phoenix.motorcontrol.LimitSwitchSource; +import com.ctre.phoenix.motorcontrol.LimitSwitchNormal; +import com.ctre.phoenix.motorcontrol.RemoteLimitSwitchSource; +import com.ctre.phoenix.motorcontrol.NeutralMode; +import com.ctre.phoenix.motorcontrol.SensorCollection; +import com.ctre.phoenix.motorcontrol.can.WPI_TalonSRX; + +import edu.wpi.first.wpilibj.Solenoid; +import edu.wpi.first.wpilibj.command.Subsystem; +import edu.wpi.first.wpilibj.smartdashboard.SmartDashboard; +import edu.wpi.first.wpilibj.Timer; + +public class Arm extends Subsystem implements ControlLoopable +{ + private static Arm instance; + + public static enum ArmControlMode { MOTION_PROFILE, JOYSTICK_PID, JOYSTICK_MANUAL, MANUAL }; + + // One revolution of the 30T Drive 1.880" PD pulley = Pi * PD inches = 36/24 revs due to pulleys * 34/24 revs due to gears * 36/12 revs due mag encoder gear on ball shifter * 4096 ticks + public static final double ENCODER_TICKS_TO_INCHES = ((360/4096)/(3))-60; + + + private double periodMs; + private double lastControlLoopUpdatePeriod = 0.0; + private double lastControlLoopUpdateTimestamp = 0.0; + // Defined speeds + public static final double CLIMB_SPEED = -1.0; + public static final double TEST_SPEED_UP = 0.3; + public static final double TEST_SPEED_DOWN = -0.3; + public static final double AUTO_ZERO_SPEED = -0.3; + public static final double JOYSTICK_INCHES_PER_MS_HI = 0.75; + public static final double JOYSTICK_INCHES_PER_MS_LO = JOYSTICK_INCHES_PER_MS_HI/3.68 * 0.8; + + // Defined positions + public static final double ZERO_POSITION_AUTON_FORWARD_INCHES = 8.0; + public static final double ZERO_POSITION_INCHES = -0.25; + public static final double NEAR_ZERO_POSITION_INCHES = 0.0; + public static final double MIN_POSITION_INCHES = 0.0; + public static final double MAX_POSITION_INCHES = 83.4; + public static final double AFTER_INTAKE_POSITION_INCHES = 4.0; + + public static final double SWITCH_POSITION_INCHES = 24.0; + public static final double SWITCH_POSITION_HIGH_INCHES = 36.0; //Switch Position for First Cube APR + public static final double SCALE_LOW_POSITION_INCHES = 56.0; + public static final double SCALE_FIRST_CUBE_POSITION_INCHES = 78.0; //72.0 + public static final double SCALE_SECOND_CUBE_POSITION_INCHES = 77.0; + public static final double SCALE_HIGH_POSITION_INCHES = MAX_POSITION_INCHES; + public static final double CLIMB_BAR_POSITION_INCHES = 70.0; + public static final double CLIMB_HIGH_POSITION_INCHES = 10.0; + public static final double CLIMB_ASSIST_POSITION_INCHES = 50.0; + + // Motion profile max velocities and accel times + public static final double MP_MAX_VELOCITY_INCHES_PER_SEC = 60; + public static final double MP_T1 = 400; // Fast = 300 + public static final double MP_T2 = 150; // Fast = 150 + + // Motor controllers + private ArrayList motorControllers = new ArrayList(); + + private TalonSRXEncoder motor1; + private TalonSRX motor2; + + // PID controller and params + private MPTalonPIDController mpController; + + public static int PID_SLOT = 0; + public static int MP_SLOT = 1; + + private PIDParams mpPIDParams = new PIDParams(0.2, 0.0, 0.0, 0.0, 0.005, 0.0); + private PIDParams pidPIDParamsHiGear = new PIDParams(0.075, 0.0, 0.0, 0.0, 0.0, 0.0); + public static final double KF_UP = 0.005; + public static final double KF_DOWN = 0.0; + public static final double PID_ERROR_INCHES = 1.0; + LimitSwitchSource limitSwitchSource; + // Pneumatics + private Solenoid speedShift; + + private ArmControlMode controlMode = ArmControlMode.JOYSTICK_PID; + // Misc + public static final double AUTO_ZERO_MOTOR_CURRENT = 4.0; + private boolean isFinished; + private ArmControlMode armControlMode = ArmControlMode.JOYSTICK_PID; + private double targetPositionInchesPID = 0; + private boolean firstMpPoint; + private double joystickInchesPerMs = JOYSTICK_INCHES_PER_MS_LO; + + public Arm() { + try { + motor1 = TalonSRXFactory.createTalonEncoder(RobotMap.ARM_MOTOR1_ID, (ENCODER_TICKS_TO_INCHES), false, FeedbackDevice.QuadEncoder); + motor2 = TalonSRXFactory.createPermanentSlaveTalon(RobotMap.ARM_MOTOR2_ID, RobotMap.ARM_MOTOR1_ID); + + + motor1.setInverted(true); + motor2.setInverted(true); + +// if (motor1.isSensorPresent(CANTalon.FeedbackDevice.QuadEncoder) != CANTalon.FeedbackDeviceStatus.FeedbackStatusPresent) { +// Driver.reportError("Could not detect elevator motor 1 encoder encoder!", false); +// } + motor1.configForwardLimitSwitchSource(limitSwitchSource, LimitSwitchNormal.NormallyOpen, 0); + motor1.configReverseLimitSwitchSource(limitSwitchSource, LimitSwitchNormal.NormallyOpen, 0); + motor1.setNeutralMode(NeutralMode.Brake); + motor2.setNeutralMode(NeutralMode.Brake); + + motorControllers.add(motor1); + + + } + catch (Exception e) { + System.err.println("An error occurred in the Arm constructor"); + } + } + + @Override + public void initDefaultCommand() { + } + + public void resetZeroPosition(double position) { + mpController.resetZeroPosition(position); + } + + private synchronized void setArmControlMode(ArmControlMode controlMode) { + this.armControlMode = controlMode; + } + + private synchronized ArmControlMode getArmControlMode() { + return this.armControlMode; + } + + public void setSpeed(double speed) { + motor1.set(ControlMode.PercentOutput, speed); + setArmControlMode(ArmControlMode.MANUAL); + } + + public void setSpeedJoystick(double speed) { + motor1.set(ControlMode.PercentOutput, speed); + setArmControlMode(ArmControlMode.JOYSTICK_MANUAL); + } + + public void setPositionPID(double targetPositionInches) { + mpController.setPIDSlot(PID_SLOT); + updatePositionPID(targetPositionInches); + setArmControlMode(ArmControlMode.JOYSTICK_PID); + setFinished(false); + } + + public void updatePositionPID(double targetPositionInches) { + targetPositionInchesPID = limitPosition(targetPositionInches); + double startPositionInches = motor1.getPositionWorld(); + mpController.setTarget(targetPositionInchesPID, targetPositionInchesPID > startPositionInches ? KF_UP : KF_DOWN); + } + + public void setPositionMP(double targetPositionInches) { + double startPositionInches = motor1.getPositionWorld(); + mpController.setMPTarget(startPositionInches, limitPosition(targetPositionInches), MP_MAX_VELOCITY_INCHES_PER_SEC, MP_T1, MP_T2); + setFinished(false); + firstMpPoint = true; + setArmControlMode(ArmControlMode.MOTION_PROFILE); + } + + private double limitPosition(double targetPosition) { + if (targetPosition < MIN_POSITION_INCHES) { + return MIN_POSITION_INCHES; + } + else if (targetPosition > MAX_POSITION_INCHES) { + return MAX_POSITION_INCHES; + } + + return targetPosition; + } + @Override + public void setPeriodMs(long periodMs) { + mpController = new MPTalonPIDController(periodMs, motorControllers); + mpController.setPID(mpPIDParams, MP_SLOT); + mpController.setPID(pidPIDParamsHiGear, PID_SLOT); + mpController.setPIDSlot(PID_SLOT); + mpController.setPID(pidPIDParamsHiGear, PID_SLOT); + mpController.setPIDSlot(PID_SLOT); + this.periodMs = periodMs; + } + /*@Override + public void onStart(double timestamp) { + mpController = new MPTalonPIDController(periodMs, motorControllers); + mpController.setPID(mpPIDParams, MP_SLOT); + mpController.setPID(pidPIDParamsHiGear, PID_SLOT); + mpController.setPIDSlot(PID_SLOT); + mpController.setPID(pidPIDParamsHiGear, PID_SLOT); + mpController.setPIDSlot(PID_SLOT); + } + + @Override + public void onStop(double timestamp) { + // TODO Auto-generated method stub + + } + + @Override + public void onLoop(double timestamp) { + synchronized (Arm.this) { + switch( getElevatorControlMode() ) { + case JOYSTICK_PID: + controlPidWithJoystick(); + break; + case JOYSTICK_MANUAL: + controlManualWithJoystick(); + break; + case MOTION_PROFILE: + if (!isFinished()) { + if (firstMpPoint) { + mpController.setPIDSlot(MP_SLOT); + firstMpPoint = false; + } + setFinished(mpController.controlLoopUpdate()); + if (isFinished()) { + mpController.setPIDSlot(PID_SLOT); + } + } + break; + default: + break; + } + } + } + +*/ + + + + + + public synchronized void controlLoopUpdate() { + // Measure *actual* update period + double currentTimestamp = Timer.getFPGATimestamp(); + if (lastControlLoopUpdateTimestamp > 0.001) { // ie, if this is NOT the first time + lastControlLoopUpdatePeriod = currentTimestamp - lastControlLoopUpdateTimestamp; + } + lastControlLoopUpdateTimestamp = currentTimestamp; + + // Do the update + if (controlMode == ArmControlMode.JOYSTICK_PID) { + controlPidWithJoystick(); + } + else if (!isFinished) { + if (controlMode == ArmControlMode.MOTION_PROFILE) { + isFinished = mpController.controlLoopUpdate(getPositionInches()); + } + + /*else if (controlMode == ArmControlMode.MP_PATH_VELOCITY) { + isFinished = mpPathVelocityController.controlLoopUpdate(getGyroAngleDeg()); + } + else if (controlMode == ArmControlMode.ADAPTIVE_PURSUIT) { + updatePose(); + isFinished = adaptivePursuitController.controlLoopUpdate(currentPose); + }*/ + } + } + + + + + + + + private void controlPidWithJoystick() { + double joystickPosition = -Robot.oi.getOperatorController().getLeftYAxis(); + double deltaPosition = joystickPosition * joystickInchesPerMs; + targetPositionInchesPID = targetPositionInchesPID + deltaPosition; + updatePositionPID(targetPositionInchesPID); + } + + private void controlManualWithJoystick() { + double joyStickSpeed = -Robot.oi.getOperatorController().getLeftYAxis(); + setSpeedJoystick(joyStickSpeed*.3); + } + /* + public void setShiftState(ElevatorSpeedShiftState state) { + + joystickInchesPerMs = JOYSTICK_INCHES_PER_MS_HI; + speedShift.set(true); + mpController.setPID(pidPIDParamsHiGear, PID_SLOT); + } + else if(state == ElevatorSpeedShiftState.LO) { + joystickInchesPerMs = JOYSTICK_INCHES_PER_MS_LO; + speedShift.set(false); + mpController.setPID(pidPIDParamsLoGear, PID_SLOT); + } + } + + public ElevatorSpeedShiftState getShiftState() { + return shiftState; + } +*/ + public double getPositionInches() { + return motor1.getPositionWorld(); + } + +// public double getAverageMotorCurrent() { +// return (Robot.pdp.getCurrent(RobotMap.ELEVATOR_MOTOR_1_CAN_ID) + Robot.pdp.getCurrent(RobotMap.ELEVATOR_MOTOR_2_CAN_ID) + Robot.pdp.getCurrent(RobotMap.ELEVATOR_MOTOR_3_CAN_ID)) / 3; +// } + + public double getAverageMotorCurrent() { + return (motor1.getOutputCurrent() + motor2.getOutputCurrent()) / 2; + } + + public synchronized boolean isFinished() { + return isFinished; + } + + public synchronized void setFinished(boolean isFinished) { + this.isFinished = isFinished; + } + + public double getPeriodMs() { + return periodMs; + } + + public void updateStatus(Robot.OperationMode operationMode) { + if (operationMode == Robot.OperationMode.TEST) { + try { + SmartDashboard.putNumber("Elevator Position Inches", motor1.getPositionWorld()); + SmartDashboard.putNumber("Elevator Motor 1 Amps", motor1.getOutputCurrent()); + SmartDashboard.putNumber("Elevator Motor 2 Amps", motor2.getOutputCurrent()); + SmartDashboard.putNumber("Elevator Average Amps", getAverageMotorCurrent()); +// SmartDashboard.putNumber("Elevator Motor 1 Amps PDP", Robot.pdp.getCurrent(RobotMap.ELEVATOR_MOTOR_1_CAN_ID)); +// SmartDashboard.putNumber("Elevator Motor 2 Amps PDP", Robot.pdp.getCurrent(RobotMap.ELEVATOR_MOTOR_2_CAN_ID)); +// SmartDashboard.putNumber("Elevator Motor 3 Amps PDP", Robot.pdp.getCurrent(RobotMap.ELEVATOR_MOTOR_3_CAN_ID)); + SmartDashboard.putNumber("Elevator Target PID Position", targetPositionInchesPID); + } + catch (Exception e) { + } + } + } + + public static Arm getInstance() { + if(instance == null) { + instance = new Arm(); + } + return instance; + } +} \ No newline at end of file