diff --git a/brewpi/brewpi.py b/brewpi/brewpi.py
index 3b13d53..3a829d6 100755
--- a/brewpi/brewpi.py
+++ b/brewpi/brewpi.py
@@ -31,7 +31,7 @@ if __name__ == '__main__':
 	DT_TASK_TRACER = DT_TASK / DT
 
 	# Sensor
-	sensor = TempSensorFactory.create(config['Controller']['sensor_name'], temp_offset=-0.15)
+	sensor = TempSensorFactory.create(config['Controller']['sensor_name'], temp_offset=-0.15, variance=0.01)
 	sensor_task = TempSensorTask(sensor, DT_TASK, dispatcher.msgio_get("Sensor"))
 	taskmgr.add(sensor_task)
 
diff --git a/components/pid/temp_controller.py b/components/pid/temp_controller.py
index 3f50315..3eda9c5 100644
--- a/components/pid/temp_controller.py
+++ b/components/pid/temp_controller.py
@@ -7,11 +7,14 @@ class TempController(TempControllerBase):
 		self.dt = dt
 		self.last_theta_ist = 20
 		self.heatrate_ist = 0
+
 	def process(self):
 		# Process Kalman
 		self.theta_ist = self.theta_ist_set
 		heatrate = (self.theta_ist - self.last_theta_ist)/self.dt*60
-		self.heatrate_ist = heatrate
+
+		alpha = 0.1
+		self.heatrate_ist = (1-alpha) * self.heatrate_ist + alpha*heatrate
 		self.last_theta_ist = self.theta_ist
 
 		# Compensate for max heat rate to reduce overshoot
diff --git a/components/pid/temp_controller_smith.py b/components/pid/temp_controller_smith.py
index 4576c35..3316c1e 100755
--- a/components/pid/temp_controller_smith.py
+++ b/components/pid/temp_controller_smith.py
@@ -45,7 +45,9 @@ class TempController(TempControllerBase):
 		self.theta_ist = self.theta_ist_model + (self.theta_ist_plant - self.theta_ist_model_delay)
 
 		heatrate = (self.theta_ist - self.last_theta_ist)/self.dt*60
-		self.heatrate_ist = heatrate
+
+		alpha = 0.1
+		self.heatrate_ist = (1-alpha) * self.heatrate_ist + alpha*heatrate
 		self.last_theta_ist = self.theta_ist
 
 		# Compensate for max heat rate to reduce overshoot
diff --git a/components/sensor/tempSensorSim.py b/components/sensor/tempSensorSim.py
index f7f6ff3..961d70c 100644
--- a/components/sensor/tempSensorSim.py
+++ b/components/sensor/tempSensorSim.py
@@ -6,13 +6,14 @@ class TempSensorSim(ATemperatureSensor):
 	def name(self):
 		return "FakeTemp"
 
-	def __init__(self, *args, **kwargs):
+	def __init__(self, temp_offset=0.0, variance=0.0, **kwargs):
 		ATemperatureSensor.__init__(self)
 		self.temp_set = 19.99
-		self.k_noise = 0.01
+		self.offset = temp_offset
+		self.variance = variance
 
 	def set_fake_temp(self, temp):
 		self.temp_set = temp
 
 	def temperature(self):
-		return self.temp_set + self.k_noise * np.random.normal(0, 1) / np.sqrt(12.0)
+		return self.temp_set + self.offset+ self.variance * np.random.normal(0, 1) / np.sqrt(12.0)
diff --git a/components/sensor/tempSensor_max31865.py b/components/sensor/tempSensor_max31865.py
index b3276de..ae64f10 100755
--- a/components/sensor/tempSensor_max31865.py
+++ b/components/sensor/tempSensor_max31865.py
@@ -8,7 +8,7 @@ class TempSensor_max31865(ATemperatureSensor):
 	def name(self):
 		return "Max31865"
 
-	def __init__(self, temp_offset=0):
+	def __init__(self, temp_offset=0, **kwargs):
 		ATemperatureSensor.__init__(self)
 		# Open SPI bus
 		self.spi = spidev.SpiDev()
diff --git a/scripts/demos/plant/demo_pot.py b/scripts/demos/plant/demo_pot.py
index 21ee5a3..181d5be 100644
--- a/scripts/demos/plant/demo_pot.py
+++ b/scripts/demos/plant/demo_pot.py
@@ -15,7 +15,6 @@ if __name__ == '__main__':
 		"M"			: 20,
 		"L"			: 0.4,
 		"Td"		: 30,
-		"kn"		: 0.2,
 		"gain"		: 1.0
 	}