diff --git a/demos/rainbow.py b/demos/rainbow.py
new file mode 100644
--- /dev/null
+++ b/demos/rainbow.py
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+### rainbow.py
+### Author: Matthew Reed
+### Rainbow array scrolls across the display. Rainbow generated using overlapping sin waves. The frequency, phase shift, center, and width all affect the output.
+
+import sys
+import time
+import signal
+import logging
+import configparser
+from enum import Enum
+
+import math
+
+class Rainbow:
+
+    def __init__(self, config, parent, matrix, controller):
+        self.logger = logging.getLogger('paint')
+        self.config = config
+        self.parent = parent
+        self.matrix = matrix
+        self.controller = controller
+        
+    def reset(self):
+        pass
+        
+    def splash(self):
+        self.matrix.set_matrix((0,255,0))
+        self.matrix.update()
+        
+    def run(self):
+    
+        center = 128;
+        width = 100;
+        frequency = .1;
+    
+        #start timers and counters
+        self.start_time = time.time()
+        last_time = time.time()
+        
+        led_iteration_count = 0
+        frame_count = 0
+        
+        keep_going = True
+        
+        while keep_going:
+            
+            for event in self.controller.read_input():
+                if event.code == 313 and event.value == 1:
+                    keep_going = False
+            
+            if time.time() > last_time + 0.1:
+                last_time = time.time()
+                    
+                for y in range(self.matrix.HEIGHT):
+                    phaseShift = 2*math.pi - y*(1.5*math.pi/(self.matrix.HEIGHT-1))
+                    for x in range(self.matrix.WIDTH):
+                        i = (x + frame_count) % 128
+                        red = math.sin(frequency*i + 0) * width + center;
+                        green = math.sin(frequency*i + phaseShift/2) * width + center;
+                        blue = math.sin(frequency*i + phaseShift) * width + center;
+                        
+                        self.matrix.set_pixel(x, y, (red, green, blue))
+                
+                self.matrix.update()
+                
+                led_iteration_count = (led_iteration_count + 1) % self.matrix.NUM_LEDS
+                frame_count = frame_count + 1
+                
+            time.sleep(0.01)
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