pid.h

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/***************************************************************************
 *   Copyright (C) 2005 by Robot Group Leipzig                             *
 *    martius@informatik.uni-leipzig.de                                    *
 *    fhesse@informatik.uni-leipzig.de                                     *
 *    der@informatik.uni-leipzig.de                                        *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the                         *
 *   Free Software Foundation, Inc.,                                       *
 *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
 *                                                                         *
 *   $Log: pid.h,v $
 *   Revision 1.12  2009/08/12 10:26:47  der
 *   tau instead of alpha
 *
 *   Revision 1.11  2009/05/11 15:43:22  martius
 *   new velocity controlling servo motors
 *
 *   Revision 1.10  2007/07/03 13:01:41  martius
 *   new pid formulas, with stepsize
 *   we use clipped sum for integral term
 *   and clipped derivative value
 *
 *   Revision 1.9  2007/04/03 16:27:50  der
 *   no stepD anymore
 *
 *   Revision 1.8  2007/01/26 12:04:15  martius
 *   servos combinied into OneAxisServo
 *
 *   Revision 1.7  2006/07/14 12:23:32  martius
 *   selforg becomes HEAD
 *
 *   Revision 1.6.4.3  2006/02/07 15:51:56  martius
 *   axis, setpower
 *
 *   Revision 1.6.4.2  2006/01/10 14:48:59  martius
 *   indentation
 *   #ifdef clausel
 *
 *   Revision 1.6.4.1  2005/12/20 17:53:42  martius
 *   changed to Joints from joint.h
 *   new servos for universal and hinge2
 *
 *   Revision 1.6  2005/11/09 14:08:48  martius
 *   *** empty log message ***
 *
 *   Revision 1.5  2005/11/09 13:28:24  fhesse
 *   GPL added
 *                                                                * 
 ***************************************************************************/
#ifndef __PID_H
#define __PID_H

namespace lpzrobots {
    
  class PID
  {
    //*********************attributes***************
    //private:
  public:
                
    double position;
    double lastposition;
    double last2position;
                
    double error;
    double lasterror;
    double derivative;
    double targetposition;
                
    double KP;
    double KI;
    double KD;
    double tau;
                
    double P;
    double D;
    double I;
        
    double force;
    double lasttime;  // last update time (to calc stepsize)

    //*********************methods******************
  public :
    /// KP is used as a general koefficient. KI and KD can be tuned without dependence of KP
    PID ( double KP = 100 , double KI = 2.0 , double KD = 0.3 );
 
    void setKP(double KP);
 
    void setTargetPosition ( double newpos );
                
    double getTargetPosition ();
                
    double step ( double newsensorval, double time);
    double stepNoCutoff ( double newsensorval, double time);
  };

}

#endif

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