diff --git a/SonarDisplay.py b/SonarDisplay.py
index b7ab21f..8650c2a 100644
--- a/SonarDisplay.py
+++ b/SonarDisplay.py
@@ -2,36 +2,44 @@
 
 import ultrasonic
 import pyb
-from ST7735 import NAVY, CYAN, Point, TFTColor
+from ST7735 import NAVY, CYAN, TFTColor
 import terminalfont
 
-ZeroPoint = Point(0, 0)
+ZeroPoint = (0, 0)
 SONAR_DELAY = 100
+MAX_RANGE = 25.0
 FONT_HEIGHT = terminalfont.terminalfont["Height"]
+NUM_DISTANCES = 4 #The number of distances to use for throwing away anomalies
+THRESHOLD = 1.0
 
 #100-15 = blue
 #15-10  = green
 #10-5   = yellow
 #5-0    = red
 
-COLORS = [(0, 255, 0, 0)
+COLORS = [(0, 255, 0, 0),
           (5, 255, 255, 0),
           (10, 0, 255, 0),
-          (15, 0, 0, 255),
+          (15, 0, 255, 255),
+          (20, 0, 0, 255)
          ]
 
+def round( aValue ) :
+  '''Round float value to 2 decimal places'''
+  return (aValue - (aValue % 0.01))
+
 def getrgb( aDistance ) :
   '''Get an interpolated TFTColor based on distance.
      Uses the COLORS list.'''
   clr = NAVY
 
   def interp(l, v0, v1):
-    return (v0 * (1.0 - l) + (v1 * l))
+    return int(v0 * (1.0 - l) + (v1 * l))
 
   for i in range(1, len(COLORS)) :
-    c = colors[i]
+    c = COLORS[i]
     if c[0] >= aDistance:
-      rng0, r0, g0, b0 = colors[i - 1]
+      rng0, r0, g0, b0 = COLORS[i - 1]
       rng1, r1, g1, b1 = c
       #interpolate between rng0 and rng1
       l = (aDistance - rng0) / float(rng1 - rng0)
@@ -39,6 +47,7 @@ def getrgb( aDistance ) :
       g = interp(l, g0, g1)
       b = interp(l, b0, b1)
       clr = TFTColor(r,g,b)
+      break
 
   return clr
 
@@ -46,24 +55,26 @@ class RangePoint(object):
   """Display a point on the screen"""
 
   def __init__(self, aSize):
-    self.size = aSize
-    self.pos = Point(-1, 0)
+    self.size = (50, aSize)
+    self.pos = (-1, 0)
     self.prevdistance = -1
 
   def update( self, aDisplay, aDistance, aTime ) :
     if (self.prevdistance != aDistance):
       self._draw(aDisplay, 0)
       clr = getrgb(aDistance)
-      self.pos.x = int((aDisplay.size.x / 2) - (self.size / 2))
-      y = min(1.0, aDistance / MAXRANGE)
-      self.pos.y = int(y * aDisplay.size.y)
+      y = min(1.0, aDistance / MAX_RANGE)
+      self.pos = (int((aDisplay.size[0] / 2) - (self.size[0] / 2)), int(y * aDisplay.size[1] - self.size[1]))
       self._draw(aDisplay, clr)
       self.prevdistance = aDistance
 
   def _draw( self, aDisplay, aColor ) :
-    if self.pos.x >= 0:
+    if self.pos[0] >= 0:
       aDisplay.fillrect(self.pos, self.size, aColor)
 
+def wrap( aVal, aMax ) :
+  return aVal if aVal < aMax else 0
+
 class SonarDisplay(object):
   """Display HC-SR04 distance on ST7735 LCD with text and a box"""
   def __init__( self, aDisplay, aTrigger, aEcho ):
@@ -71,12 +82,32 @@ class SonarDisplay(object):
     self.triggerpin = aTrigger
     self.echopin = aEcho
     self.rangepoint = RangePoint(4)
+    self.curdistance = 0.0
+    self.distances = [0.0] * NUM_DISTANCES
+    self.distindex = 0
     self.hc = ultrasonic.Ultrasonic(self.triggerpin, self.echopin)
 
   def printdistance( self, aDistance ) :
-    s = "I: " + str(aDistance)
-    aDisplay.fillrect(ZeroPoint, Point(aDisplay.size.x, FONT_HEIGHT), 0)
-    aDisplay.drawstring(ZeroPoint, s, CYAN, terminalfont.terminalfont)
+    s = "I:" + str(round(aDistance))
+    self.display.fillrect(ZeroPoint, (self.display.size[0], FONT_HEIGHT), 0)
+    self.display.text(ZeroPoint, s, CYAN, terminalfont.terminalfont)
+
+  def _getdistance( self ) :
+    '''Throw away changes that are not averaged. This introduces
+       a slight delay in update but gets rid of most bad distances'''
+
+    d = self.hc.distance_in_inches()
+    good = 0
+    for c in self.distances :
+      if abs(c - d) < THRESHOLD:
+        good += 1
+        if good > 2:
+          self.curdistance = d
+          break
+
+    self.distances[self.distindex] = d
+    self.distindex = wrap(self.distindex + 1, NUM_DISTANCES)
+    return self.curdistance
 
   def run( self ):
     self.display.fill(0)
@@ -84,7 +115,8 @@ class SonarDisplay(object):
     lasttime = pyb.millis()
     while sw() == False :
       pyb.delay(SONAR_DELAY)
-      distance = self.hc.distance_in_inches()
+      distance = self._getdistance()
+
       thistime = pyb.millis()
       t = thistime - lasttime
       self.printdistance(distance)
diff --git a/bombs.py b/bombs.py
index d9b3186..0c59be8 100644
--- a/bombs.py
+++ b/bombs.py
@@ -1,7 +1,7 @@
 
 import pyb
 import time
-from ST7735 import Point, CYAN, RED, GREEN, YELLOW, TFTColor
+from ST7735 import CYAN, RED, GREEN, YELLOW, TFTColor
 
 #todo: Pick a ransom spot, random radius, random color
 #todo: Animate the spot
@@ -45,15 +45,15 @@ class bomber(object):
     self.sw = pyb.Switch()
 
   def addbomb( self ) :
-    x = int(randval(self.display.size.x))
-    y = int(randval(self.display.size.y))
+    x = int(randval(self.display.size[0]))
+    y = int(randval(self.display.size[1]))
     rad = randval(20) + 5
     r = pyb.rng() & 0xFF
     g = pyb.rng() & 0xFF
     b = pyb.rng() & 0xFF
     spd = randval(30.0) + 1.0
     clr = TFTColor(r,g,b) #colorA[pyb.rng() & 0x03]
-    self.bombs.insert(0, bomb(Point(x, y), rad, clr, spd))
+    self.bombs.insert(0, bomb((x, y), rad, clr, spd))
 
   def run( self ) :
     while self.sw() == False :
diff --git a/level.py b/level.py
index 62c3bdf..c582160 100644
--- a/level.py
+++ b/level.py
@@ -1,18 +1,18 @@
 #Show level bubble run by the accelerometer
 
 import pyb
-from ST7735 import RED, CYAN, Point
+from ST7735 import RED, CYAN
 import terminalfont
 
-ZeroPoint = Point(0, 0)
+ZeroPoint = (0, 0)
 
 class Bubble(object):
   """Circle simulating the level bubble."""
 
   def __init__(self, aCenter, aSpeed, aRadius, aColor):
-    self.center = aCenter.clone()
-    self.pos = aCenter.clone()
-    self.oldpos = pos.clone()
+    self.center = aCenter
+    self.pos = aCenter
+    self.oldpos = self.pos
     self.speed = aSpeed
     self.radius = aRadius
     self.color = aColor
@@ -23,16 +23,14 @@ class Bubble(object):
 #     xtilt = self.accel.x()
 #     ytilt = self.accel.y()
 
-    xs = (aDisplay.size.x / 2) / 70.0
-    ys = (aDisplay.size.y / 2) / 60.0
+    xs = (aDisplay.size[0] / 2) / 70.0
+    ys = (aDisplay.size[1] / 2) / 60.0
 
-    self.oldpos.x = self.pos.x
-    self.oldpos.y = self.pos.y
-    self.pos.x = int(self.center.x + xtilt * xs)
-    self.pos.y = int(self.center.y - ytilt * ys)
+    self.oldpos = self.pos
+    self.pos = (int(self.center[0] + xtilt * xs), int(self.center[1] - ytilt * ys))
     s = "x: " + str(xtilt) + " y: " + str(ytilt)
-    aDisplay.fillrect(ZeroPoint, Point(aDisplay.size.x, 10), 0)
-    aDisplay.drawstring(ZeroPoint, s, CYAN, terminalfont.terminalfont)
+    aDisplay.fillrect(ZeroPoint, (aDisplay.size[0], 10), 0)
+    aDisplay.text(ZeroPoint, s, CYAN, terminalfont.terminalfont)
 #     aTime *= self.speed
 #     self.pos.x += xtilt * aTime
 #     self.pos.y -= ytilt * aTime
@@ -47,20 +45,19 @@ class Bubble(object):
   def _clamp( self, aDisplay ) :
     l = self.radius
     t = l
-    r = aDisplay.size.x - l
-    b = aDisplay.size.y - l
-    self.pos.x = max(l, min(self.pos.x, r))
-    self.pos.y = max(t, min(self.pos.y, b))
+    r = aDisplay.size[0] - l
+    b = aDisplay.size[1] - l
+    self.pos = (max(l, min(self.pos[0], r)), max(t, min(self.pos[1], b)))
 
 class Level(object):
   """Simulate a level by controlling a bubble on the aDisplay
      controlled by the accelerometer."""
   def __init__(self, aDisplay):
     self.display = aDisplay
-    center = aDisplay.size.clone()
-    center.x /= 2
-    center.y /= 2
-    self.bubble = Bubble(center, 10.0, 5, RED)
+    cx, cy = aDisplay.size
+    cx /= 2
+    cy /= 2
+    self.bubble = Bubble((cx, cy), 10.0, 5, RED)
 
   def run( self ) :
     self.display.fill(0)