diff --git a/devtimer.py b/devtimer.py
new file mode 100755
index 0000000..6041217
--- /dev/null
+++ b/devtimer.py
@@ -0,0 +1,156 @@
+#!/usr/bin/env python3
+
+import subprocess
+from time import time, sleep, localtime
+
+from wiringpi import wiringPiSetupGpio, pinMode, digitalRead, digitalWrite, GPIO
+wiringPiSetupGpio()
+
+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):
+    min = elapsed // 60
+    sec = elapsed % 60
+    d0 = tm.digit_to_segment[min // 10]
+    d1 = tm.digit_to_segment[min % 10]
+    d2 = tm.digit_to_segment[sec // 10]
+    d3 = tm.digit_to_segment[sec % 10]
+    tm.set_segments([d0, 0x80 + d1, d2, d3])
+
+if __name__ == "__main__":
+
+    tm = TM1637(CLK, DIO)
+
+    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