Index: firmware/App/Controllers/MixingControl.c
===================================================================
diff -u -rf364406cd1f672078ca38ae8aad5bc508e9b64dd -rcf3c037762699407089411de04bc9d1f4b597784
--- firmware/App/Controllers/MixingControl.c	(.../MixingControl.c)	(revision f364406cd1f672078ca38ae8aad5bc508e9b64dd)
+++ firmware/App/Controllers/MixingControl.c	(.../MixingControl.c)	(revision cf3c037762699407089411de04bc9d1f4b597784)
@@ -159,6 +159,8 @@
 // publish
 static OVERRIDE_U32_T  mixingControlDataPublishInterval;                                                        ///< Mixing Control data publish interval.
 static U32  mixingControlDataPublicationTimerCounter;                                                           ///< Used to schedule  mixingControl data publication to CAN bus.
+static F32 lastBicarbMixVolume;                                                                                 ///< Deadband bicarb mix volume
+static F32 lastAcidMixVolume;                                                                                   ///< Deadband acid mix volume
 
 //  mixing
 static OVERRIDE_F32_T  mixingControlAcidVolume;                                                                 ///< Acid concentrate volume in ml ( overrideable).
@@ -338,44 +340,6 @@
 
 /*********************************************************************//**
  * @brief
- * The execDialysateCompositionMixingController function adjusts the volume of acid and bicarb based on the target
- * conductivity of bicarb and dialysate solution
- * @details \b Inputs: dialysateMix[ mixId ].dialysateMixingState
- * @details \b Outputs:dialysateMix[ mixId ].dialysateMixingState
- * @details \b Alarms: ALARM_ID_DD_SOFTWARE_FAULT if invalid dialysate mixing
- * state machine found.
- * @return none
- *************************************************************************/
-static void handleDialysateCompositionMixing( void )
-{
-    DIALYSATE_MIXING_ID_T mixId;
-
-    for ( mixId = DIALYSATE_MIX_ID_FIRST; mixId < NUM_OF_DIALYSATE_MIXING_ID; mixId++ )
-    {
-        switch ( dialysateMix[ mixId ].dialysateMixingState )
-        {
-            case DIALYSATE_MIXING_OPEN_LOOP_STATE:
-                dialysateMix[ mixId ].dialysateMixingState = handleDialysateMixOpenLoopState( mixId );
-                break;
-
-            case DIALYSATE_MIXING_RAMP_UP_STATE:
-                dialysateMix[ mixId ].dialysateMixingState = handleDialysateMixRampToTargetState( mixId );
-                break;
-
-            case DIALYSATE_MIXING_CONTROL_TO_TARGET_STATE:
-                dialysateMix[ mixId ].dialysateMixingState = handleDialysateMixControlToTargetState( mixId );
-                break;
-
-            default:
-                SET_ALARM_WITH_2_U32_DATA( ALARM_ID_DD_SOFTWARE_FAULT, SW_FAULT_ID_DIALYSATE_MIX_EXEC_INVALID_STATE, mixId )
-                dialysateMix[ mixId ].dialysateMixingState = DIALYSATE_MIXING_OPEN_LOOP_STATE;
-                break;
-        }
-    }
-}
-
-/*********************************************************************//**
- * @brief
  * The execMixingControl function executes the dialysate and bicarb open loop /closed loop
  * related state machines
  * @details \b Inputs: Balancing chamber state
@@ -769,6 +733,7 @@
             }
             else
             {
+                lastBicarbMixVolume = getBicarbMixVol();
                 //use the previous value
             }
 
@@ -801,6 +766,7 @@
             else
             {
                 // use the previous value
+                lastAcidMixVolume = getAcidMixVol();
             }
 
             debugAcidControl = getDebugPIControllerSignals( PI_CONTROLLER_ID_ACID_VOL );
@@ -812,10 +778,44 @@
     return state;
 }
 
+/*********************************************************************//**
+ * @brief
+ * The execDialysateCompositionMixingController function adjusts the volume of acid and bicarb based on the target
+ * conductivity of bicarb and dialysate solution
+ * @details \b Inputs: dialysateMix[ mixId ].dialysateMixingState
+ * @details \b Outputs:dialysateMix[ mixId ].dialysateMixingState
+ * @details \b Alarms: ALARM_ID_DD_SOFTWARE_FAULT if invalid dialysate mixing
+ * state machine found.
+ * @return none
+ *************************************************************************/
+static void handleDialysateCompositionMixing( void )
+{
+    DIALYSATE_MIXING_ID_T mixId;
 
+    for ( mixId = DIALYSATE_MIX_ID_FIRST; mixId < NUM_OF_DIALYSATE_MIXING_ID; mixId++ )
+    {
+        switch ( dialysateMix[ mixId ].dialysateMixingState )
+        {
+            case DIALYSATE_MIXING_OPEN_LOOP_STATE:
+                dialysateMix[ mixId ].dialysateMixingState = handleDialysateMixOpenLoopState( mixId );
+                break;
 
+            case DIALYSATE_MIXING_RAMP_UP_STATE:
+                dialysateMix[ mixId ].dialysateMixingState = handleDialysateMixRampToTargetState( mixId );
+                break;
 
+            case DIALYSATE_MIXING_CONTROL_TO_TARGET_STATE:
+                dialysateMix[ mixId ].dialysateMixingState = handleDialysateMixControlToTargetState( mixId );
+                break;
 
+            default:
+                SET_ALARM_WITH_2_U32_DATA( ALARM_ID_DD_SOFTWARE_FAULT, SW_FAULT_ID_DIALYSATE_MIX_EXEC_INVALID_STATE, mixId )
+                dialysateMix[ mixId ].dialysateMixingState = DIALYSATE_MIXING_OPEN_LOOP_STATE;
+                break;
+        }
+    }
+}
+
 /*********************************************************************//**
  * @brief
  * The publishMixingControlData function broadcasts the Mixing Controller
@@ -837,10 +837,12 @@
         data.acidMixingState                            = (U32)dialysateMix[ ACID_MIX_ID ].dialysateMixingState;
         data.acidControlInterval                        = (U32)dialysateMix[ ACID_MIX_ID ].controlTimerCounter;
 
-        data.bicarbVolume                               = getBicarbMixVol();
-        data.acidVolume                                 = getAcidMixVol();
+        data.currentBicarbMixVolume                     = getBicarbMixVol();
+        data.lastBicarbMixVolume                        = lastBicarbMixVolume;
+        data.currentAcidMixVolume                       = getAcidMixVol();
+        data.currentAcidMixVolume                       = lastAcidMixVolume;
 
-        // broadcast theretical pre and post conductivity
+        //TODO :broadcast theretical pre and post conductivity
 
         // TODO: remove after feature testing
         memcpy( &data.bicarbData, &bicarbControlSignals, sizeof( PI_CONTROLLER_SIGNALS_DATA ) );
Index: firmware/App/Controllers/MixingControl.h
===================================================================
diff -u -rf364406cd1f672078ca38ae8aad5bc508e9b64dd -rcf3c037762699407089411de04bc9d1f4b597784
--- firmware/App/Controllers/MixingControl.h	(.../MixingControl.h)	(revision f364406cd1f672078ca38ae8aad5bc508e9b64dd)
+++ firmware/App/Controllers/MixingControl.h	(.../MixingControl.h)	(revision cf3c037762699407089411de04bc9d1f4b597784)
@@ -41,8 +41,10 @@
     U32 bicarbControlInterval;                          ///< Bicarb Control interval
     U32 acidMixingState;                                ///< Acid mixing state
     U32 acidControlInterval;                            ///< Acid control interval
-    F32 bicarbVolume;                                   ///< Mixing control bicarb mix volume
-    F32 acidVolume;                                     ///< Mixing control acid mix volume
+    F32 currentBicarbMixVolume;                         ///< Mixing control current bicarb mix volume
+    F32 lastBicarbMixVolume;                            ///< Mixing control last bicarb mix volume
+    F32 currentAcidMixVolume;                           ///< Mixing control current acid mix volume
+    F32 lastAcidMixVolume;                              ///< Mixing control last acid mix volume
     // TODO: remove after closed loops stabilized
     PI_CONTROLLER_SIGNALS_DATA bicarbData;              ///< Mixing control bicarb mixing closed loop control signals data
     PI_CONTROLLER_SIGNALS_DATA acidData;                ///< Mixing control acid mixing closed loop control signals data