diff --git a/devtimer.py b/devtimer.py
index 6041217..24d6f73 100755
--- a/devtimer.py
+++ b/devtimer.py
@@ -1,118 +1,20 @@
 #!/usr/bin/env python3
+# devtimer.py - Temperature Controlled Photographic Darkroom Timer
+# Targeted for RaspberryPi
+# Copyright (c) 2018 TundraWare Inc.
+# Permission Hereby Granted For Unrestricted Personal Or Commercial Use
 
-import subprocess
-from time import time, sleep, localtime
 
-from wiringpi import wiringPiSetupGpio, pinMode, digitalRead, digitalWrite, GPIO
+from time import time, sleep
+from tm1637 import *
+from wiringpi import wiringPiSetupGpio
+
 wiringPiSetupGpio()
 
+BRIGHTNESS = 0x09
 CLK = 21
 DIO = 20
 
-"""
-      A
-     ---
-  F |   | B
-     -G-
-  E |   | C
-     ---
-      D
-
-"""
-
-
-class TM1637:
-    I2C_COMM1 = 0x40
-    I2C_COMM2 = 0xC0
-    I2C_COMM3 = 0x80
-    digit_to_segment = [
-        0b0111111, # 0
-        0b0000110, # 1
-        0b1011011, # 2
-        0b1001111, # 3
-        0b1100110, # 4
-        0b1101101, # 5
-        0b1111101, # 6
-        0b0000111, # 7
-        0b1111111, # 8
-        0b1101111, # 9
-        0b1110111, # A
-        0b1111100, # b
-        0b0111001, # C
-        0b1011110, # d
-        0b1111001, # E
-        0b1110001  # F
-        ]
-
-    def __init__(self, clk, dio):
-        self.clk = clk
-        self.dio = dio
-        self.brightness = 0x09 # 0x0f
-
-        pinMode(self.clk, GPIO.INPUT)
-        pinMode(self.dio, GPIO.INPUT)
-        digitalWrite(self.clk, GPIO.LOW)
-        digitalWrite(self.dio, GPIO.LOW)
-
-    def bit_delay(self):
-        sleep(0.001)
-        return
-
-    def set_segments(self, segments, pos=0):
-        # Write COMM1
-        self.start()
-        self.write_byte(self.I2C_COMM1)
-        self.stop()
-
-        # Write COMM2 + first digit address
-        self.start()
-        self.write_byte(self.I2C_COMM2 + pos)
-
-        for seg in segments:
-            self.write_byte(seg)
-        self.stop()
-
-        # Write COMM3 + brightness
-        self.start()
-        self.write_byte(self.I2C_COMM3 + self.brightness)
-        self.stop()
-
-    def start(self):
-        pinMode(self.dio, GPIO.OUTPUT)
-        self.bit_delay()
-
-    def stop(self):
-        pinMode(self.dio, GPIO.OUTPUT)
-        self.bit_delay()
-        pinMode(self.clk, GPIO.INPUT)
-        self.bit_delay()
-        pinMode(self.dio, GPIO.INPUT)
-        self.bit_delay()
-
-    def write_byte(self, b):
-      # 8 Data Bits
-        for i in range(8):
-
-            # CLK low
-            pinMode(self.clk, GPIO.OUTPUT)
-            self.bit_delay()
-
-            pinMode(self.dio, GPIO.INPUT if b & 1 else GPIO.OUTPUT)
-
-            self.bit_delay()
-
-            pinMode(self.clk, GPIO.INPUT)
-            self.bit_delay()
-            b >>= 1
-
-        pinMode(self.clk, GPIO.OUTPUT)
-        self.bit_delay()
-        pinMode(self.clk, GPIO.INPUT)
-        self.bit_delay()
-        pinMode(self.clk, GPIO.OUTPUT)
-        self.bit_delay()
-
-        return
 
 
 def show_elapsed(tm, elapsed):
@@ -124,33 +26,18 @@
     d3 = tm.digit_to_segment[sec % 10]
     tm.set_segments([d0, 0x80 + d1, d2, d3])
 
+
+
 if __name__ == "__main__":
 
-    tm = TM1637(CLK, DIO)
+    tm = TM1637(CLK, DIO, BRIGHTNESS)
 
     start_time = int(time())
     show_elapsed(tm, 0)
 
     while True:
+
         sleep(.05)
         show_elapsed(tm, int(time())-start_time)
         if int(time())-start_time == 5999:
             start_time = int(time())
-
-
-
-#    tm.set_segments([0, 0, 0, 0])
-#    value = 0
-#    digits = []
-#        th = value // 1000
-#        hu = (value %  1000) // 100
-#        tn = (value % 100) //  10
-#        on = value % 10
-#        digits = [tm.digit_to_segment[th], tm.digit_to_segment[hu], tm.digit_to_segment[tn], tm.digit_to_segment[on]]
-#        tm.set_segments(digits)
-#        sleep(.05)
-
-#        if value == 9999:
-#            value = 0
-#        else:
-#            value += 1
diff --git a/tm1637.py b/tm1637.py
new file mode 100644
index 0000000..e417b5a
--- /dev/null
+++ b/tm1637.py
@@ -0,0 +1,113 @@
+# Tip of the hat to https://github.com/johnlr/raspberrypi-tm1637 for
+# this code.  I has been very slightly modified, but it mostly his
+# work.
+
+from time import sleep
+from wiringpi import pinMode, digitalRead, digitalWrite, GPIO
+
+"""
+      A
+     ---
+  F |   | B
+     -G-
+  E |   | C
+     ---
+      D
+
+"""
+
+
+class TM1637:
+    I2C_COMM1 = 0x40
+    I2C_COMM2 = 0xC0
+    I2C_COMM3 = 0x80
+    digit_to_segment = [
+        0b0111111, # 0
+        0b0000110, # 1
+        0b1011011, # 2
+        0b1001111, # 3
+        0b1100110, # 4
+        0b1101101, # 5
+        0b1111101, # 6
+        0b0000111, # 7
+        0b1111111, # 8
+        0b1101111, # 9
+        0b1110111, # A
+        0b1111100, # b
+        0b0111001, # C
+        0b1011110, # d
+        0b1111001, # E
+        0b1110001  # F
+        ]
+
+    def __init__(self, clk, dio, brightness):
+        self.clk = clk
+        self.dio = dio
+        self.brightness = brightness
+
+        pinMode(self.clk, GPIO.INPUT)
+        pinMode(self.dio, GPIO.INPUT)
+        digitalWrite(self.clk, GPIO.LOW)
+        digitalWrite(self.dio, GPIO.LOW)
+
+    def bit_delay(self):
+        sleep(0.001)
+        return
+
+    def set_segments(self, segments, pos=0):
+        # Write COMM1
+        self.start()
+        self.write_byte(self.I2C_COMM1)
+        self.stop()
+
+        # Write COMM2 + first digit address
+        self.start()
+        self.write_byte(self.I2C_COMM2 + pos)
+
+        for seg in segments:
+            self.write_byte(seg)
+        self.stop()
+
+        # Write COMM3 + brightness
+        self.start()
+        self.write_byte(self.I2C_COMM3 + self.brightness)
+        self.stop()
+
+    def start(self):
+        pinMode(self.dio, GPIO.OUTPUT)
+        self.bit_delay()
+
+    def stop(self):
+        pinMode(self.dio, GPIO.OUTPUT)
+        self.bit_delay()
+        pinMode(self.clk, GPIO.INPUT)
+        self.bit_delay()
+        pinMode(self.dio, GPIO.INPUT)
+        self.bit_delay()
+
+    def write_byte(self, b):
+      # 8 Data Bits
+        for i in range(8):
+
+            # CLK low
+            pinMode(self.clk, GPIO.OUTPUT)
+            self.bit_delay()
+
+            pinMode(self.dio, GPIO.INPUT if b & 1 else GPIO.OUTPUT)
+
+            self.bit_delay()
+
+            pinMode(self.clk, GPIO.INPUT)
+            self.bit_delay()
+            b >>= 1
+
+        pinMode(self.clk, GPIO.OUTPUT)
+        self.bit_delay()
+        pinMode(self.clk, GPIO.INPUT)
+        self.bit_delay()
+        pinMode(self.clk, GPIO.OUTPUT)
+        self.bit_delay()
+
+        return
+
+# End of class 'TM1637'