PID20_DeadZone.patch

Index: fhem/FHEM/98_PID20.pm
===================================================================
--- fhem/FHEM/98_PID20.pm	(revision 11268)
+++ fhem/FHEM/98_PID20.pm	(working copy)
@@ -102,6 +102,7 @@
     . 'pidActorKeepAlive '
     . 'pidActorLimitLower '
     . 'pidActorLimitUpper '
+    . 'pidActorDeadZoneLower '
     . 'pidActorCallBeforeSetting '
     . 'pidIPortionCallBeforeSetting '
     . 'pidCalcInterval '
@@ -316,7 +317,8 @@
       $ret .= 'Factor I         : ' . $hash->{helper}{factor_I} . "\n";
       $ret .= 'Factor D         : ' . $hash->{helper}{factor_D} . "\n\n";
       $ret .= 'Actor lower limit: ' . $hash->{helper}{actorLimitLower} . "\n";
-      $ret .= 'Actor upper limit: ' . $hash->{helper}{actorLimitUpper} . "\n";
+      $ret .= 'Actor upper limit: ' . $hash->{helper}{actorLimitUpper} . "\n\n";
+      $ret .= 'Actor lower dead zone: ' . $hash->{helper}{actorDeadZoneLower} . "\n";
       return $ret;
     }
     default { return $usage; }
@@ -468,6 +470,8 @@
     my $actorLimitLower = $hash->{helper}{actorLimitLower};
     $hash->{helper}{actorLimitUpper} = ( AttrVal( $name, 'pidActorLimitUpper', 100 ) =~ m/$reFloat/ ) ? $1 : 100;
     my $actorLimitUpper = $hash->{helper}{actorLimitUpper};
+    $hash->{helper}{actorDeadZoneLower} = ( AttrVal( $name, 'pidActorDeadZoneLower', 0 ) =~ m/$reFloat/ ) ? $1 : 0;
+    my $actorDeadZoneLower = $hash->{helper}{actorDeadZoneLower};
     $hash->{helper}{factor_P} = ( AttrVal( $name, 'pidFactor_P', 25 ) =~ m/$reFloatpos/ )   ? $1 : 25;
     $hash->{helper}{factor_I} = ( AttrVal( $name, 'pidFactor_I', 0.25 ) =~ m/$reFloatpos/ ) ? $1 : 0.25;
     $hash->{helper}{factor_D} = ( AttrVal( $name, 'pidFactor_D', 0 ) =~ m/$reFloatpos/ )    ? $1 : 0;
@@ -574,6 +578,12 @@
 
       # calc actuation
       $actuationCalc = $pPortion + $iPortion + $dPortion;
+      
+      # add dead zone offset
+      if ($actuationCalc > 0.1)
+      {
+	$actuationCalc = $actuationCalc + $actorDeadZoneLower;
+      }
 
       PID20_Log $hash, 2, 'P1 delta:' . sprintf( "%.2f", $delta ) . " isWindup:$isWindup" if ($DEBUG_Calc);