Reverse some calculations to measure distance to the ceiling instead

of the floor

code/table.py

@@ -68,21 +68,23 @@ class Table:
          - Zero distances is stop
         """
 
-        # Calculate target height
-        targetHeight = self.currentHeight() + distance
+        # Calculate target height (Assuming we're measuring the distance
+        # to the ceiling)
+        targetHeight = self.currentHeight() - distance
 
         # Default to not move in any direction
         direction = 0
 
         while True:
             # Calculate how far to move
-            currentHeightDiff = targetHeight - self.currentHeight()
+            currentHeightDiff = (self.currentHeight() - targetHeight) * -1
 
-            # Calculate which direction to move in
+            # Calculate which direction to move in (Assuming that we're
+            # measuring the diff height to the ceiling)
             if currentHeightDiff > 1:
-                direction = 1
-            elif currentHeightDiff < -1:
                 direction = -1
+            elif currentHeightDiff < -1:
+                direction = 1
             else:
                 # Reset the relays
                 self.triggerRelay(0)