diff -r 59024371cd50 -r 6dc755f1970e Hardware/Hardware.cs
--- a/Hardware/Hardware.cs	Wed Dec 08 19:23:13 2010 +0000
+++ b/Hardware/Hardware.cs	Thu Jan 20 21:31:54 2011 +0000
@@ -55,13 +55,13 @@
       get { return active.ToArray(); }
     }
 
-    protected void ActivateSensor(Sensor sensor) {
+    protected void ActivateSensor(ISensor sensor) {
       if (active.Add(sensor)) 
         if (SensorAdded != null)
           SensorAdded(sensor);
     }
 
-    protected void DeactivateSensor(Sensor sensor) {
+    protected void DeactivateSensor(ISensor sensor) {
       if (active.Remove(sensor))
         if (SensorRemoved != null)
           SensorRemoved(sensor);