of the N temps readings every duty cycle, 2s by default, strip the top 25 percent and bottom 25 percent from those readings, use the rest to get the average temp over the cycle.

lib/oven.py

@@ -158,9 +158,21 @@ class TempSensorReal(TempSensor):
                 self.bad_count += 1
 
             if len(temps):
-                self.temperature = sum(temps) / len(temps)
+                self.temperature = self.get_avg_temp(temps)
             time.sleep(self.sleeptime)
 
+    def get_avg_temp(self, temps, chop=25):
+        '''
+        strip off chop percent from the beginning and end of the sorted temps
+        then return the average of what is left
+        '''
+        chop = chop / 100
+        temps = sorted(temps)
+        total = len(temps)
+        items = int(total*chop)
+        temps = temps[items:total-items]
+        return sum(temps) / len(temps)
+
 class Oven(threading.Thread):
     '''parent oven class. this has all the common code
        for either a real or simulated oven'''