Index: firmware/App/Controllers/PresOccl.c
===================================================================
diff -u -r8cebc7f282f403c99f712d422454c15414b6fc73 -r84e94699ac1a6236a6aba130e45149a9cf3ac5f8
--- firmware/App/Controllers/PresOccl.c	(.../PresOccl.c)	(revision 8cebc7f282f403c99f712d422454c15414b6fc73)
+++ firmware/App/Controllers/PresOccl.c	(.../PresOccl.c)	(revision 84e94699ac1a6236a6aba130e45149a9cf3ac5f8)
@@ -363,7 +363,15 @@
         // Check for stale arterial pressure reading
         if ( FALSE == isPersistentAlarmTriggered( ALARM_ID_HD_VENOUS_PRESSURE_READ_TIMEOUT_ERROR, ( lastArterialPressureReadCtr == artReadCtr || artErrorCtr > 0 ) ) )
         {
+#ifndef PBA_ESTIMATION
             arterialPressure.data = ARTERIAL_PRESSURE_V_PER_BIT * ( (F32)(artPres) / ( ARTERIAL_PRESSURE_SENSITIVITY * ARTERIAL_PRESSURE_V_BIAS ) ) + getF32OverrideValue( &arterialPressureOffset );
+#else
+            // TODO - temporary test code - remove later
+            F32 artPres = -0.1146 * getMeasuredBloodPumpMCSpeed();
+            artPres = MAX(-200.0,artPres);
+            artPres = MIN(0,artPres);
+            arterialPressure.data = artPres;
+#endif
         }
         else
         {
Index: firmware/App/HDCommon.h
===================================================================
diff -u -r8a0735916a4006faaf0651d685131916517c4f33 -r84e94699ac1a6236a6aba130e45149a9cf3ac5f8
--- firmware/App/HDCommon.h	(.../HDCommon.h)	(revision 8a0735916a4006faaf0651d685131916517c4f33)
+++ firmware/App/HDCommon.h	(.../HDCommon.h)	(revision 84e94699ac1a6236a6aba130e45149a9cf3ac5f8)
@@ -50,6 +50,7 @@
 //    #define RUN_BP_OPEN_LOOP                1           // Run blood pump in open loop mode
 //    #define RUN_DPI_OPEN_LOOP               1           // Run dialysate inlet pump in open loop mode
     #define WORN_OUT_CARTRIDGE              1           // Running with an old worn out cartridge (max wear)
+    #define PBA_ESTIMATION                  1           // Estimate arterial pressure rather than look at PBA sensor
     #define DISABLE_MOTOR_CURRENT_CHECKS    1           // Do not error on HD pump current checks
     #define DISABLE_PUMP_FLOW_CHECKS        1           // Do not error on HD pump flow checks
     #define DISABLE_PUMP_SPEED_CHECKS       1           // Do not error on HD pump speed checks