diff --git a/fsmPev.py b/fsmPev.py
index 8f19401..b3285cd 100644
--- a/fsmPev.py
+++ b/fsmPev.py
@@ -118,6 +118,7 @@ class fsmPev():
         # We just use the initial request message from the Ioniq. It contains one entry: DIN.
         self.addToTrace("Sending the initial SupportedApplicationProtocolReq")
         self.Tcp.transmit(addV2GTPHeader(exiHexToByteArray(exiHexDemoSupportedApplicationProtocolRequestIoniq)))
+        self.hardwareInterface.resetSimulation()
         self.enterState(stateWaitForSupportedApplicationProtocolResponse)
         
     def stateFunctionWaitForSupportedApplicationProtocolResponse(self):
@@ -313,6 +314,7 @@ class fsmPev():
             self.enterState(stateSequenceTimeout)
 
     def stateFunctionWaitForPreChargeResponse(self):
+        self.hardwareInterface.simulatePreCharge()
         if (self.DelayCycles>0):
             self.DelayCycles-=1
             return    
@@ -325,6 +327,9 @@ class fsmPev():
             if (strConverterResult.find("PreChargeRes")>0):
                 # todo: check the request content, and fill response parameters
                 self.addToTrace("PreCharge aknowledge received.")
+                s = "U_Inlet " + str(self.hardwareInterface.getInletVoltage()) + "V, "
+                s= s + "U_Accu " + str(self.hardwareInterface.getAccuVoltage()) + "V"
+                self.addToTrace(s)
                 if (abs(self.hardwareInterface.getInletVoltage()-self.hardwareInterface.getAccuVoltage()) < PARAM_U_DELTA_MAX_FOR_END_OF_PRECHARGE):
                     self.addToTrace("Difference between accu voltage and inlet voltage is small. Sending PowerDeliveryReq.")
                     self.hardwareInterface.setPowerRelayOn()
diff --git a/hardwareInterface.py b/hardwareInterface.py
index 0c16a7e..714efe1 100644
--- a/hardwareInterface.py
+++ b/hardwareInterface.py
@@ -52,7 +52,7 @@ class hardwareInterface():
         
     def getInletVoltage(self):
         #todo: get real measured voltage from the inlet
-        self.inletVoltage = 230
+        self.inletVoltage = self.simulatedInletVoltage
         return self.inletVoltage
         
     def getAccuVoltage(self):
@@ -87,6 +87,14 @@ class hardwareInterface():
         self.simulatedSoc = 20.0 # percent
         self.inletVoltage = 0.0 # volts
         self.findSerialPort()
+        
+    def resetSimulation(self):
+        self.simulatedInletVoltage = 0.0 # volts
+        self.simulatedSoc = 20.0 # percent
+        
+    def simulatePreCharge(self):
+        if (self.simulatedInletVoltage<230):
+            self.simulatedInletVoltage = self.simulatedInletVoltage + 1.0 # simulate increasing voltage during PreCharge
 
     def close(self):
         if (self.isInterfaceOk):