diff --git a/__pycache__/particle.cpython-312.pyc b/__pycache__/particle.cpython-312.pyc
index 25b743f..077ed3f 100644
Binary files a/__pycache__/particle.cpython-312.pyc and b/__pycache__/particle.cpython-312.pyc differ
diff --git a/__pycache__/sensor.cpython-312.pyc b/__pycache__/sensor.cpython-312.pyc
new file mode 100644
index 0000000..ba68a55
Binary files /dev/null and b/__pycache__/sensor.cpython-312.pyc differ
diff --git a/__pycache__/slider.cpython-312.pyc b/__pycache__/slider.cpython-312.pyc
new file mode 100644
index 0000000..ca00cce
Binary files /dev/null and b/__pycache__/slider.cpython-312.pyc differ
diff --git a/main.py b/main.py
index 1624859..3c20a5d 100644
--- a/main.py
+++ b/main.py
@@ -3,19 +3,23 @@ import numpy as np
 import matplotlib.pyplot as plt
 from particle import Particle
 from sensor import Sensor
+from slider import Slider
 
 pygame.init()
 
 SCREEN_WIDTH = 800
 SCREEN_HEIGHT = 600
 
+SENSOR_DISTANCE = 200
+
+y_lim = 40000
 
 
 screen = pygame.display.set_mode((SCREEN_WIDTH, SCREEN_HEIGHT))
 
-sensor = Sensor(width = 50, distance = 200, space = 200)
+sensor = Sensor(width = 50, distance = SENSOR_DISTANCE, space = 300)
 
-silica = Particle(speed = 1, size = 20, perm = 4)
+silica = Particle(speed = 1, size = 60, perm = 4)
 
 time = .1
 time_data = []
@@ -26,13 +30,13 @@ volume_data = []
 plt.ion()
 fig, ax = plt.subplots()
 line, = ax.plot([], [], 'r-')
-ax.set_xlim(0, 400)
-ax.set_ylim(0, 40000)
+ax.set_xlim(0, 800)
+ax.set_ylim(-1000, y_lim)
 ax.set_xlabel('Time (s)')
 ax.set_ylabel('Volume')
 ax.set_title('Volume/time')
 
-
+slider1 = Slider(20, 20, 100, 20, 20, SENSOR_DISTANCE / 2, 80)
 
 run = True
 while run:
@@ -49,12 +53,22 @@ while run:
   sensor.generate(SCREEN_WIDTH, SCREEN_HEIGHT, screen)
 
   pygame.draw.circle(screen, (255, 255, 255), (distance - silica.size, 300), silica.size)
+  pygame.draw.circle(screen, (0,255,0), (distance - silica.size, 300), 10)
+
+  slider1.draw(screen)
+
+  silica.updateSize(slider1.value) 
 
   for event in pygame.event.get():
     if event.type == pygame.QUIT:
       run = False
+    slider1.handle_event(event)
 
-  volume = sensor.testSensor1(distance, silica)
+  volume = sensor.getParticleVolume(distance, silica)
+
+  if (volume > y_lim):
+    y_lim = volume + (volume * 1.2)
+    ax.set_ylim(-1000, y_lim)
 
   time_data.append(time)
   volume_data.append(volume)
@@ -69,10 +83,6 @@ while run:
   pygame.display.update()
 
   time = time + 1
-
-  print(volume)
-
-
   
 pygame.quit()
 
diff --git a/particle.py b/particle.py
index 7162884..6977c62 100644
--- a/particle.py
+++ b/particle.py
@@ -15,4 +15,8 @@ class Particle:
     partialVol = (1/3) * math.pi * height * height * ((3 * self.size) - height)
     return partialVol
 
+  def updateSize(self, size):
+    self.size = size
+    self.volume = (4/3) * math.pi * size * size * size
+
 
diff --git a/sensor.py b/sensor.py
index 61ce981..d30499a 100644
--- a/sensor.py
+++ b/sensor.py
@@ -7,7 +7,7 @@ class Sensor:
     self.space = space
     
   def generate(self, screenWidth, screenHeight, screen):
-    self.sensor1_x = (screenWidth / 2) - (self.space / 2)
+    self.sensor1_x = (screenWidth / 2) - (self.space / 2) - self.width
     self.sensor1_y = 0
     self.sensor1_x_size = self.width
     self.sensor1_y_size = (screenHeight / 2) - (self.distance / 2)
@@ -20,15 +20,85 @@ class Sensor:
     pygame.draw.rect(screen, (0, 0, 255), sensor1a)
     pygame.draw.rect(screen, (0, 0, 255), sensor1b)
 
+    self.sensor2_x = (screenWidth / 2) + (self.space / 2)
+    self.sensor2_y = 0
+    self.sensor2_x_size = self.width
+    self.sensor2_y_size = (screenHeight / 2) - (self.distance / 2)
+
+    self.inner2 = self.sensor2_x
+    self.outer2 = self.inner2 + self.width
+    
+    sensor2a = pygame.Rect(self.sensor2_x, self.sensor2_y, self.sensor2_x_size, self.sensor2_y_size)
+    sensor2b = pygame.Rect(self.sensor2_x, self.sensor2_y + self.sensor2_y_size + self.distance, self.sensor2_x_size, self.sensor2_y_size)
+    pygame.draw.rect(screen, (0, 0, 255), sensor2a)
+    pygame.draw.rect(screen, (0, 0, 255), sensor2b)
+
   def testSensor1(self, partCenter, particle):
-    if particle.size >= abs(self.inner1 - (partCenter - particle.size)):
-      volume = particle.partialVol(particle.size - (self.inner1 - (partCenter - particle.size)))
+    
+    particle_x = partCenter - particle.size
+    particle_right = particle_x + particle.size
+    particle_left = particle_x - particle.size
+    # Sensor lines on one half of sphere center
+    if particle_right > self.outer1 and particle_x < self.inner1:
+      volume = particle.partialVol(self.width + (particle_right - self.outer1)) - particle.partialVol(particle_right - self.outer1)
+      print("On right half")
+      print(volume)
       return volume
-    elif particle.size >= abs(self.outer1 - (partCenter - particle.size)):
-      volume = particle.volume - particle.partialVol(particle.size - (self.outer1 - (partCenter - particle.size)))
+    # if Sensor is on left half of sphere center
+    elif particle_left < self.inner1 and particle_x > self.outer1:
+      volume = particle.partialVol(self.width + (self.inner1 - particle_left)) - particle.partialVol(self.inner1 - particle_left)
+      print("On left half")
+      print(volume)
       return volume
-    elif ((partCenter - particle.size) >= self.inner1 and (partCenter - particle.size) <= self.outer1):
+    # On bolth halves
+    elif (particle_x >= self.inner1 and particle_x <= self.outer1) and particle_left < self.inner1 and particle_right > self.outer1:
+      volume_left = particle.partialVol(self.inner1 - particle_left)
+      volume_right = particle.partialVol(particle_right - self.outer1)
+      volume = particle.volume - (volume_left + volume_right)
+      print("On both halves")
+      print(volume_left)
+      print(volume_right)
+      return volume
+    elif (particle_right > self.inner1 and particle_right < self.outer1)  and particle_x <= self.inner1:
+      volume = particle.partialVol(particle_right - self.inner1)
+      print("Approaching from left")
+      print(volume)
+      return volume
+    elif (particle_left > self.inner1 and particle_left < self.outer1) and particle_x >= self.outer1:
+      volume = particle.partialVol(self.outer1 - particle_left)
+      print("Leaving from left")
+      print(volume)
+      return volume
+    elif (particle_right > self.inner1 and particle_right <= self.outer1) and (particle_left >= self.inner1 and particle_left < self.outer1):
+      print("in between")
+      print(particle.volume)
+      return particle.volume
+    else:
+      return 0
+
+  def testSensor2(self, partCenter, particle):
+    if (particle.size >= abs(self.inner2 - (partCenter - particle.size))) and (particle.size >= abs(self.outer2 - (partCenter - particle.size))):
+      volume = ((particle.volume / 2) - (particle.partialVol(particle.size - ((partCenter - particle.size) - self.inner2)))) + ((particle.volume / 2) - particle.partialVol(particle.size - (self.outer2 - (partCenter - particle.size)))) 
+      return volume
+    elif particle.size >= abs(self.inner2 - (partCenter - particle.size)):
+      volume = particle.partialVol(particle.size - (self.inner2 - (partCenter - particle.size)))
+      return volume
+    elif particle.size >= abs(self.outer2 - (partCenter - particle.size)):
+      volume = particle.volume - particle.partialVol(particle.size - (self.outer2 - (partCenter - particle.size)))
+      return volume
+    elif ((partCenter - particle.size) >= self.inner2 and (partCenter - particle.size) <= self.outer2):
       volume = particle.volume
       return volume
     else:
-      return 0
\ No newline at end of file
+      return 0
+
+  def getParticleVolume(self, partCenter, particle):
+    volume1 = self.testSensor1(partCenter, particle)
+    volume2 = self.testSensor2(partCenter, particle)
+
+    if volume1:
+      return volume1
+    elif volume2:
+      return volume2
+    else:
+      return 0
diff --git a/slider.py b/slider.py
new file mode 100644
index 0000000..304e27d
--- /dev/null
+++ b/slider.py
@@ -0,0 +1,35 @@
+import pygame
+
+WHITE = (255, 255, 255)
+GRAY = (200, 200, 200)
+BLACK = (0, 0, 0)
+RED = (255, 0, 0)
+
+class Slider:
+
+    def __init__(self, x, y, w, h, min_val, max_val, initial_val):
+        self.rect = pygame.Rect(x, y, w, h)
+        self.min_val = min_val
+        self.max_val = max_val
+        self.value = initial_val
+        self.grabbed = False
+
+    def draw(self, screen):
+        # Draw the background
+        pygame.draw.rect(screen, GRAY, self.rect)
+        # Draw the handle (circle)
+        handle_x = self.rect.x + (self.value - self.min_val) / (self.max_val - self.min_val) * self.rect.width
+        pygame.draw.circle(screen, RED, (int(handle_x), self.rect.centery), self.rect.height // 2)
+
+    def handle_event(self, event):
+        if event.type == pygame.MOUSEBUTTONDOWN:
+            if self.rect.collidepoint(event.pos):
+                self.grabbed = True
+        elif event.type == pygame.MOUSEBUTTONUP:
+            self.grabbed = False
+        elif event.type == pygame.MOUSEMOTION:
+            if self.grabbed:
+                mouse_x = event.pos[0]
+                # Constrain the handle within the slider
+                new_value = (mouse_x - self.rect.x) / self.rect.width * (self.max_val - self.min_val) + self.min_val
+                self.value = max(self.min_val, min(self.max_val, new_value))