diff --git a/doors.py b/doors.py
index 012f6fb..da4aba5 100755
--- a/doors.py
+++ b/doors.py
@@ -49,9 +49,8 @@ GPIO.setup(GREEN_LED, GPIO.OUT)
 GPIO.setup(YELLOW_LED, GPIO.OUT)
 
 
-#Be explicit with what we want
-OFF = 0  # Low voltage, ground
-ON  = 1  # High voltage
+OFF = GPIO.LOW
+ON  = GPIO.HIGH
 
 
 def unlock_door():
diff --git a/simulator/RPi/GPIO.py b/simulator/RPi/GPIO.py
index de9026b..90b57cc 100644
--- a/simulator/RPi/GPIO.py
+++ b/simulator/RPi/GPIO.py
@@ -3,12 +3,14 @@ print("Using fake GPIO driver.")
 BOARD = "board"
 IN    = "input"
 OUT   = "output"
+HIGH  = 1
+LOW   = 0
 
 def cleanup():
 	print("> GPIO: cleaning up!")
 
 def output(pin, voltage):
-	state = "on" if (voltage == 1) else "off"
+	state = "ON" if (voltage == HIGH) else "OFF"
 	print("> GPIO setting pin %s to %s." % (pin, state))
 
 def setmode(mode):