ArActionDesired *Acquire::fire(ArActionDesired currentDesired)
{
  myDesired.reset();
  switch (myState) {
  case STATE_START_LOOKING:
    myFirstTurn.clear();
    mySecondTurn.clear();
    myState = STATE_LOOKING;
  case STATE_LOOKING:
    if (myActs->getNumBlobs(myChannel) > 0)
    {
      myDesired.setDeltaHeading(0);
      myState = STATE_SUCCEEDED;
      printf("Acquire: Succeeded!\n");
    }
    else if (myFirstTurn.didAll() && mySecondTurn.didAll())
    {
      myDesired.setDeltaHeading(0);
      myState = STATE_FAILED;
      printf("Acquire: Did two revolutions, didn't see the blob, Failed!\n");
    } 
    else
    {
      myFirstTurn.update(myRobot->getTh());
      if (myFirstTurn.didAll())
	mySecondTurn.update(myRobot->getTh());
      myDesired.setDeltaHeading(8);
    }
    return &myDesired;
  default:
    return NULL;
  }
}
Example #2
0
ArActionDesired *Acquire::fire(ArActionDesired currentDesired)
{
  myDesired.reset();
  myDesired.setVel(0);
  switch (myState) {
  case STATE_START_LOOKING:
    myFirstTurn.clear();
    mySecondTurn.clear();
    myState = STATE_LOOKING;
    myGripper->liftUp();
    myGripper->gripClose();
    printf("Acquire: Raising lift\n");
    myStartUp.setToNow();
    myTryingGripper = true;
  case STATE_LOOKING:
    if (myTryingGripper && (myStartUp.mSecSince() < 600 ||
			    ((!myGripper->isLiftMaxed() ||
			      myGripper->getGripState() != 2) && 
			     myStartUp.mSecSince() < 5000)))
    {
      myGripper->liftUp();
      myGripper->gripClose();
      myDesired.setVel(0);
      myDesired.setDeltaHeading(0);
      return &myDesired;
    } 
    else if (myTryingGripper)
    {
      printf("Acquire: Done raising lift %ld after started.\n", 
	     myStartUp.mSecSince());
      myTryingGripper = false;
    }
    if (myActs->getNumBlobs(myChannel) > 0)
    {
      myDesired.setDeltaHeading(0);
      myState = STATE_SUCCEEDED;
      printf("Acquire: Succeeded!\n");
    }
    else if (myFirstTurn.didAll() && mySecondTurn.didAll())
    {
      myDesired.setDeltaHeading(0);
      myState = STATE_FAILED;
      printf("Acquire: Did two revolutions, didn't see the blob, Failed!\n");
    } 
    else
    {
      myFirstTurn.update(myRobot->getTh());
      if (myFirstTurn.didAll())
	mySecondTurn.update(myRobot->getTh());
      myDesired.setDeltaHeading(8);
    }
    return &myDesired;
  default:
    myDesired.setVel(0);
    myDesired.setDeltaHeading(0);
    return &myDesired;
  }
}
int main(void)
{
  ArACTSBlob blob;
  double xRel, yRel;
  int i;

  acts.openPort(NULL);
  acts.requestPacket();
  while(1)
  {
    if (acts.receiveBlobInfo())
      {
	//acts.receiveBlobInfo();
	for (i = 0; i < 8; i++)
	  if (acts.getNumBlobs(i) >= 1 && acts.getBlob(i, 1, &blob))
	    {
	      xRel = (double)(blob.getXCG() - WIDTH/2.0) / (double)WIDTH;
	      yRel = (double)(blob.getYCG() - HEIGHT/2.0) / (double)HEIGHT;
	      printf("Chan %d xRel %.4f yRel %.4f    ", i, xRel, yRel);
	      blob.log();
	    }
	acts.requestPacket();
	ArUtil::sleep(80);
      }
    ArUtil::sleep(5);
  }

}
ArActionDesired *DropOff::fire(ArActionDesired currentDesired)
{
  ArPose pose;
  ArACTSBlob blob;
  bool blobSeen = false;
  double xRel, yRel;
  double dist;


  myDesired.reset();
  if (myState == STATE_SUCCEEDED)
  {
    printf("DropOff: Succeeded\n");
    myDesired.setVel(0);
    myDesired.setDeltaHeading(0);
    return &myDesired;
  }
  else if (myState == STATE_FAILED)
  {
    printf("DropOff: Failed\n");
    myDesired.setVel(0);
    myDesired.setDeltaHeading(0);
    return &myDesired;
  }

  if (myActs->getNumBlobs(myChannel) > 0 &&
      (blobSeen = myActs->getBlob(myChannel, 1, &blob)))
  {
    myLastSeen.setToNow();
  }

  // this if the stuff we want to do if we're not going to just drive forward
  // and home in on the color, ie the pickup-specific stuff
  if (myState == STATE_START_LOOKING)
  {
    mySentGripper.setToNow();
    myPointedDown = false;
    myState = STATE_LOOKING;
    myLastSeen.setToNow();
    myTried = false;
    myLastMoved.setToNow();
    myLastPose = myRobot->getPose();
    //myWaitingOnGripper = true;
    myWaitingOnLower = false;
    myLowered = false;
    myWaitingOnRaised = false;
    myStartRaised = false;
    printf("@@@@@ DropOff: Starting\n");
  }

  // we want to sit still until the lift is down or for a second and a half
  /*
  if (myWaitingOnGripper) 
  {
    if (mySentGripper.mSecSince() < 500 || 
	(myGripper->getGripState() != 1
	 && mySentGripper.mSecSince() < 4000))
    {
      myDesired.setVel(0);
      myDesired.setDeltaHeading(0);
      myLastMoved.setToNow();
      myLastPose = myRobot->getPose();
      return &myDesired;
    }
    else
    {
      myWaitingOnGripper = false;
    }
    myLastMoved.setToNow();
    myLastPose = myRobot->getPose();
  } 
  */
  //printf("sensors %d %d stall %d %d\n",!(myRobot->getDigIn() & ArUtil::BIT2),
  //!(myRobot->getDigIn() & ArUtil::BIT3),
  //myRobot->isLeftMotorStalled(), myRobot->isRightMotorStalled());
  if ((myRobot->isLeftBreakBeamTriggered() &&
       myRobot->isRightBreakBeamTriggered()) ||
       myRobot->isLeftMotorStalled() || myRobot->isRightMotorStalled())
  {
    if (!myWaitingOnLower && !myLowered && !myWaitingOnRaised)
    {
      myWaitingOnLower = true;
      printf("DropOff: Lowering gripper\n");
      mySentGripper.setToNow();
    }
  }
  if (myWaitingOnLower)
  {
    /// TODO
    if (mySentGripper.mSecSince() < 600 || 
	(!myGripper->isLiftMaxed() && mySentGripper.mSecSince() < 20000))
    {
      myGripper->liftDown();
      myDesired.setVel(0);
      myDesired.setDeltaHeading(0);
      myLastMoved.setToNow();
      myLastPose = myRobot->getPose();
      return &myDesired;
    }
    else
    {
      printf("DropOff: Lowered!\n");
      myWaitingOnLower = false;
      myWaitingOnRaised = true;
      myStartRaised = true;
    }
    myLastMoved.setToNow();
    myLastPose = myRobot->getPose();
  }

  if (myWaitingOnRaised)
  {
    if (myStartRaised)
    {
      printf("DropOff: Raising gripper a little bit\n");
      myGripper->liftCarry(15);
      mySentGripper.setToNow();
      myStartRaised = false;
    }
    if (mySentGripper.mSecSince() > 1000)
    {
      printf("DropOff: Raised the gripper a little bit\n");
      myWaitingOnRaised = false;
      myLowered = true;
    }
    myDesired.setVel(0);
    myDesired.setDeltaHeading(0);
    myLastMoved.setToNow();
    myLastPose = myRobot->getPose();
    return &myDesired;
  }

  if (myLowered)
  {
    if (!myTried)
    {
      printf("DropOff: Trying to let go of the block.\n");
      myTriedStart.setToNow();
      myTried = true;
    }
    myGripper->gripOpen();
    if (myGripper->getGripState() == 1 || myTriedStart.mSecSince() > 3000)
    {
      printf("DropOff: Succeeded, dropped off the block.\n");
      myGripper->liftUp();
      myState = STATE_SUCCEEDED;
    }
    myDesired.setVel(0);
    myDesired.setDeltaHeading(0);
    return &myDesired;
  }

  pose = myRobot->getPose();
  dist = myLastPose.findDistanceTo(pose);
  if (dist < 5 && myLastMoved.mSecSince() > 2500)
  {
    printf("DropOff: Failed, no movement in the last 2500 msec.\n");
    myState = STATE_FAILED;
    myGripper->gripOpen();
    myGripper->liftUp();
    myDesired.setVel(0);
    myDesired.setDeltaHeading(0);
    return &myDesired;
  }
  else if (dist > 5)
  {
    myLastMoved.setToNow();
    myLastPose = myRobot->getPose();
  }

  if (!blobSeen)
  {
    if (((!myPointedDown && myLastSeen.mSecSince() > 1500) ||
	 (myPointedDown && myLastSeen.mSecSince() > 4000)) &&
	myGripper->getBreakBeamState() == 0)
    {
      printf("DropOff:  Lost the blob, failed, last saw it %ld msec ago.\n",
	     myLastSeen.mSecSince());
      myState = STATE_FAILED;
      myGripper->gripOpen();
      ArUtil::sleep(3);
      myGripper->liftUp();
      myDesired.setVel(0);
      myDesired.setDeltaHeading(0);
      return &myDesired;
    }
  } 
  else
    myLastSeen.setToNow();

  if (blobSeen)
  {
    xRel = (double)(blob.getXCG() - WIDTH/2.0) / (double)WIDTH + CAMERA_X_CORRECTION;
    yRel = -(double)(blob.getYCG() - HEIGHT/2.0) / (double)HEIGHT;
    //printf("xRel %.3f yRel %.3f:  ", xRel, yRel);
  } 
  else
  {
    //printf("No blob: ");
  }

  if (blobSeen && yRel < -.2  && !myPointedDown)
  {
    printf("DropOff: Pointing the camera down!!!\n");
    myAMPTU->panTilt(0, -75);
    myPointedDown = true;
  }
  
  
  if (!blobSeen || ArMath::fabs(xRel) < .001)
  {
    //printf("Going straight ahead\n");
    myDesired.setDeltaHeading(0);
  }
  else
  {
    //printf("Turning %.2f\n", -xRel * 30);
    if (-xRel > 1.0)
      myDesired.setDeltaHeading(30);
    else if (-xRel < -1.0)
      myDesired.setDeltaHeading(-30);
    else
      myDesired.setDeltaHeading(-xRel * 30);
  }
  if (myRobot->isLeftTableSensingIRTriggered() ||
      myRobot->isRightTableSensingIRTriggered())
    myDesired.setVel(50);
  else
    myDesired.setVel(100);
  return &myDesired;
}
int main(void)
{
  ArSerialConnection con;
  ArRobot robot;
  int ret;
  std::string str;
  ArActionLimiterForwards limiter("speed limiter near", 225, 600, 250);
  ArActionLimiterForwards limiterFar("speed limiter far", 225, 1100, 400);
  ArActionTableSensorLimiter tableLimiter;
  ArActionLimiterBackwards backwardsLimiter;
  ArActionConstantVelocity stop("stop", 0);
  ArSonarDevice sonar;
  ArACTS_1_2 acts;
  ArPTZ *ptz;
  ptz = new ArVCC4(&robot, true);
  ArGripper gripper(&robot);
  
  Acquire acq(&acts, &gripper);
  DriveTo driveTo(&acts, &gripper, ptz);
  DropOff dropOff(&acts, &gripper, ptz);
  PickUp pickUp(&acts, &gripper, ptz);
  

  TakeBlockToWall takeBlock(&robot, &gripper, ptz, &acq, &driveTo, &pickUp,
			    &dropOff, &tableLimiter);

  if (!acts.openPort(&robot))
  {
    printf("Could not connect to acts, exiting\n");
    exit(0);    
  }
  Aria::init();
  
  robot.addRangeDevice(&sonar);
  //con.setBaud(38400);
  if ((ret = con.open()) != 0)
  {
    str = con.getOpenMessage(ret);
    printf("Open failed: %s\n", str.c_str());
    Aria::shutdown();
    return 1;
  }

  robot.setDeviceConnection(&con);
  if (!robot.blockingConnect())
  {
    printf("Could not connect to robot... exiting\n");
    Aria::shutdown();
    return 1;
  }

  ptz->init();
  ArUtil::sleep(8000);
  printf("### 2222\n");
  ptz->panTilt(0, -40);
  printf("### whee\n");
  ArUtil::sleep(8000);
  robot.setAbsoluteMaxTransVel(400);

  robot.setStateReflectionRefreshTime(250);
  robot.comInt(ArCommands::ENABLE, 1);
  robot.comInt(ArCommands::SOUNDTOG, 0);

  ArUtil::sleep(200);
  robot.addAction(&tableLimiter, 100);
  robot.addAction(&limiter, 99);
  robot.addAction(&limiterFar, 98);
  robot.addAction(&backwardsLimiter, 97);
  robot.addAction(&acq, 77);
  robot.addAction(&driveTo, 76);
  robot.addAction(&pickUp, 75);
  robot.addAction(&dropOff, 74);
  robot.addAction(&stop, 30);

  robot.run(true);
  
  Aria::shutdown();
  return 0;
}
ArActionDesired *DriveTo::fire(ArActionDesired currentDesired)
{
  ArACTSBlob blob;
  double xRel, yRel;
  ArPose pose;
  double dist;

  if (myState == STATE_SUCCEEDED || myState == STATE_FAILED)
  {
    myDesired.setVel(0);
    myDesired.setDeltaHeading(0);
    return &myDesired;
  }

  if (myState == STATE_START_LOOKING)
  {
    myState = STATE_LOOKING;
    myLastSeen.setToNow();
    myLastPose = myRobot->getPose();
    myLastMoved.setToNow();
  }

  pose = myRobot->getPose();
  dist = myLastPose.findDistanceTo(pose);
  if (dist < 5 && myLastMoved.mSecSince() > 1500)
  {
    printf("DriveTo: Failed, no movement in the last 1500 msec.\n");
    myState = STATE_FAILED;
    myDesired.setVel(0);
    myDesired.setDeltaHeading(0);
    return &myDesired;
  }
  else if (dist > 5)
  {
    myLastMoved.setToNow();
    myLastPose = myRobot->getPose();
  }

  if (myActs->getNumBlobs(myChannel) == 0 || 
      !myActs->getBlob(myChannel, 1, &blob))
  {
    if (myLastSeen.mSecSince() > 1000)
    {
      printf("DriveTo:  Lost the blob, failed.\n");
      myState = STATE_FAILED;
      myDesired.setVel(0);
      myDesired.setDeltaHeading(0);
      return &myDesired;
    }
  }
  else
  {
    myLastSeen.setToNow();
  }

  xRel = (double)(blob.getXCG() - WIDTH/2.0) / (double)WIDTH + CAMERA_X_CORRECTION;
  yRel = (double)(blob.getYCG() - HEIGHT/2.0) / (double)HEIGHT;
  
  //printf("xRel %.3f yRel %.3f\n", xRel, yRel);

  myDesired.reset();
  // this if the stuff we want to do if we're not going to just drive forward
  // and home in on the color, ie the pickup-specific stuff
  if (currentDesired.getMaxVelStrength() > 0 &&
      currentDesired.getMaxVel() < 125)
  {
    printf("DriveTo:  Close to a wall of some sort, succeeded.\n");
    myState = STATE_SUCCEEDED;
    myDesired.setVel(0);
    myDesired.setDeltaHeading(0);
    return &myDesired;
  }
  
  if (ArMath::fabs(xRel) < .10)
  {
    //printf("Going straight ahead\n");
    myDesired.setDeltaHeading(0);
  }
  else
  {
    //printf("Turning %.2f\n", -xRel * 20);
    if (-xRel > 1.0)
      myDesired.setDeltaHeading(20);
    else if (-xRel < -1.0)
      myDesired.setDeltaHeading(-20);
    else
      myDesired.setDeltaHeading(-xRel * 20);
  }
  myDesired.setVel(150);
  return &myDesired;
}
Example #7
0
int main(void)
{
  ArSerialConnection con;
  ArRobot robot;
  int ret;
  std::string str;
  ArActionLimiterForwards limiter("speed limiter near", 300, 600, 250);
  ArActionLimiterForwards limiterFar("speed limiter far", 300, 1100, 400);
  ArActionLimiterBackwards backwardsLimiter;
  ArActionConstantVelocity stop("stop", 0);
  ArActionConstantVelocity backup("backup", -200);
  ArSonarDevice sonar;
  ArACTS_1_2 acts;
  ArSonyPTZ sony(&robot);
  ArGripper gripper(&robot, ArGripper::GENIO);
  
  Acquire acq(&acts, &gripper);
  DriveTo driveTo(&acts, &gripper, &sony);
  PickUp pickUp(&acts, &gripper, &sony);

  TakeBlockToWall takeBlock(&robot, &gripper, &sony, &acq, &driveTo, &pickUp,
			    &backup);

  Aria::init();

   if (!acts.openPort(&robot))
   {
     printf("Could not connect to acts\n");
     exit(1);
   }
  
  robot.addRangeDevice(&sonar);
  //con.setBaud(38400);
  if ((ret = con.open()) != 0)
  {
    str = con.getOpenMessage(ret);
    printf("Open failed: %s\n", str.c_str());
    Aria::shutdown();
    return 1;
  }

  robot.setDeviceConnection(&con);
  if (!robot.blockingConnect())
  {
    printf("Could not connect to robot... exiting\n");
    Aria::shutdown();
    return 1;
  }

  sony.init();
  ArUtil::sleep(1000);
  //robot.setAbsoluteMaxTransVel(400);

  robot.setStateReflectionRefreshTime(250);
  robot.comInt(ArCommands::ENABLE, 1);
  robot.comInt(ArCommands::SOUNDTOG, 0);

  ArUtil::sleep(200);
  robot.addAction(&limiter, 100);
  robot.addAction(&limiterFar, 99);
  robot.addAction(&backwardsLimiter, 98);
  robot.addAction(&acq, 77);
  robot.addAction(&driveTo, 76);
  robot.addAction(&pickUp, 75);
  robot.addAction(&backup, 50);
  robot.addAction(&stop, 30);

  robot.run(true);
  
  Aria::shutdown();
  return 0;
}
Example #8
0
ArActionDesired *DriveTo::fire(ArActionDesired currentDesired)
{
  ArACTSBlob blob;
  double xRel, yRel;

  if (myState == STATE_SUCCEEDED || myState == STATE_FAILED)
  {
    myDesired.setVel(0);
    myDesired.setDeltaHeading(0);
    return &myDesired;
  }

  if (myState == STATE_START_LOOKING)
  {
    myState = STATE_LOOKING;
    myLastSeen.setToNow();
  }

  if (myActs->getNumBlobs(myChannel) == 0 || 
      !myActs->getBlob(myChannel, 1, &blob))
  {
    if (myLastSeen.mSecSince() > 1000)
    {
      printf("DriveTo:  Lost the blob, failed.\n");
      myState = STATE_FAILED;
      myDesired.setVel(0);
      myDesired.setDeltaHeading(0);
      return &myDesired;
    }
  }
  else
  {
    myLastSeen.setToNow();
  }

  xRel = (double)(blob.getXCG() - WIDTH/2.0) / (double)WIDTH;
  yRel = (double)(blob.getYCG() - HEIGHT/2.0) / (double)HEIGHT;
  
  //printf("xRel %.3f yRel %.3f\n", xRel, yRel);

  myDesired.reset();
  // this if the stuff we want to do if we're not going to just drive forward
  // and home in on the color, ie the pickup-specific stuff
  if (currentDesired.getMaxVelStrength() > 0 &&
      currentDesired.getMaxVel() < 125)
  {
    printf("DriveTo:  Close to a wall of some sort, succeeded.\n");
    myState = STATE_SUCCEEDED;
    myDesired.setVel(0);
    myDesired.setDeltaHeading(0);
    return &myDesired;
  }
  
  if (ArMath::fabs(xRel) < .10)
  {
    //printf("Going straight ahead\n");
    myDesired.setDeltaHeading(0);
  }
  else
  {
    //printf("Turning %.2f\n", -xRel * 10);
    myDesired.setDeltaHeading(-xRel * 10);
  }
  myDesired.setVel(300);
  return &myDesired;
}
Example #9
0
ArActionDesired *PickUp::fire(ArActionDesired currentDesired)
{
  ArPose pose;
  ArACTSBlob blob;
  bool blobSeen = false;
  double xRel, yRel;
  double dist;

  myDesired.reset();
  if (myState == STATE_SUCCEEDED)
  {
    //printf("PickUp: Succeeded\n");
    myDesired.setVel(0);
    myDesired.setDeltaHeading(0);
    return &myDesired;
  }
  else if (myState == STATE_FAILED)
  {
    //printf("PickUp: Failed\n");
    myDesired.setVel(0);
    myDesired.setDeltaHeading(0);
    return &myDesired;
  }

  // this if the stuff we want to do if we're not going to just drive forward
  // and home in on the color, ie the pickup-specific stuff
  if (myState == STATE_START_LOOKING)
  {
    myGripper->gripOpen();
    ArUtil::sleep(3);
    myGripper->liftDown();
    mySentLiftDown.setToNow();
    myPointedDown = false;
    myState = STATE_LOOKING;
    myLastSeen.setToNow();
    myTried = false;
    myLastMoved.setToNow();
    myLastPose = myRobot->getPose();
    myWaitingOnGripper = true;
    printf("@@@@@ Pickup: Lowering lift\n");
  }

  // we want to sit still until the lift is down or for a second and a half
  if (myWaitingOnGripper) 
  {
    if (mySentLiftDown.mSecSince() < 500 || 
	((!myGripper->isLiftMaxed() || myGripper->getGripState() != 2)
	 && mySentLiftDown.mSecSince() < 5000))
    {
      myGripper->liftDown();
      myGripper->gripOpen();
      myDesired.setVel(0);
      myDesired.setDeltaHeading(0);
      myLastMoved.setToNow();
      myLastPose = myRobot->getPose();
      return &myDesired;
    }
    else
    {
      myWaitingOnGripper = false;
    }
    myLastMoved.setToNow();
    myLastPose = myRobot->getPose();
  } 

  if (myGripper->getBreakBeamState() != 0)
  {
    if (myGripper->getGripState() == 2)
    {
      printf("PickUp: Succeeded, have block.\n");
      myGripper->liftUp();
      myState = STATE_SUCCEEDED;
    }
    else if (!myTried)
    {
      myGripper->gripClose();
      printf("PickUp: Trying to pick up.\n");
      myTried = true;
      myTriedStart.setToNow();
    }
    myDesired.setVel(0);
    myDesired.setDeltaHeading(0);
    return &myDesired;
  }
  // this means that the grippers are closed, but we don't have anything in 
  // them, ie that we failed to get the block
  else if (myTried && (myGripper->getGripState() == 2 || 
		       myTriedStart.mSecSince() > 5000))
  {
    myState = STATE_FAILED;
    myGripper->gripOpen();
    ArUtil::sleep(3);
    myGripper->liftUp();
    printf("PickUp: Grippers closed, didn't get a block, failed.\n");
    myDesired.setVel(0);
    myDesired.setDeltaHeading(0);
    return &myDesired;
  }
     
  pose = myRobot->getPose();
  dist = myLastPose.findDistanceTo(pose);
  if (dist < 5 && myLastMoved.mSecSince() > 1500)
  {
    printf("PickUp: Failed, no movement in the last 1500 msec.\n");
    myState = STATE_FAILED;
    myGripper->gripOpen();
    myGripper->liftUp();
    myDesired.setVel(0);
    myDesired.setDeltaHeading(0);
    return &myDesired;
  }
  else if (dist > 5)
  {
    myLastMoved.setToNow();
    myLastPose = myRobot->getPose();
  }

  if (myActs->getNumBlobs(myChannel) == 0 || 
      !(blobSeen = myActs->getBlob(myChannel, 1, &blob)))
  {
    if (((!myPointedDown && myLastSeen.mSecSince() > 1500) ||
	 (myPointedDown && myLastSeen.mSecSince() > 4000)) &&
	myGripper->getBreakBeamState() == 0)
    {
      printf("PickUp:  Lost the blob, failed, last saw it %ld msec ago.\n",
	     myLastSeen.mSecSince());
      myState = STATE_FAILED;
      myGripper->gripOpen();
      ArUtil::sleep(3);
      myGripper->liftUp();
      myDesired.setVel(0);
      myDesired.setDeltaHeading(0);
      return &myDesired;
    }
  } 
  else
    myLastSeen.setToNow();
  

  if (blobSeen)
  {
    xRel = (double)(blob.getXCG() - WIDTH/2.0) / (double)WIDTH;
    yRel = (double)(blob.getYCG() - HEIGHT/2.0) / (double)HEIGHT;
    //printf("xRel %.3f yRel %.3f:\n", xRel, yRel);
  } 
  else
  {
    //printf("No blob: ");
  }

  if (blobSeen && yRel < 0.2 && !myPointedDown)
  {
    printf("PickUp: Pointing the camera down!!!\n");
    mySony->panTilt(0, -ArSonyPTZ::MAX_TILT);
    myPointedDown = true;
  }
  
  
  if (!blobSeen || ArMath::fabs(xRel) < .10)
  {
    //printf("Going straight ahead\n");
    myDesired.setDeltaHeading(0);
  }
  else
  {
    //printf("Turning %.2f\n", -xRel * 10);
    if (ArMath::fabs(-xRel * 10) <= 10)
      myDesired.setDeltaHeading(-xRel * 10);
    else if (-xRel > 0)
      myDesired.setDeltaHeading(10);
    else
      myDesired.setDeltaHeading(-10);
  }
  myDesired.setVel(150);
  return &myDesired;
}