Ignore change on state change

desk_presence.py

@@ -233,21 +233,28 @@ def detect_face(gray):
 
 
 def detect_motion(gray):
-    if ignore_motion_due_to_light():
-        log.debug("Ignoring motion due to light cooldown")
-        return False
+    light_cooldown = ignore_motion_due_to_light()
 
+    # If no previous frame exists, initialize it
     if not os.path.exists(PREV_IMG):
         cv2.imwrite(PREV_IMG, gray)
+        log.debug("Initialized previous frame")
         return False
 
     prev = cv2.imread(PREV_IMG, cv2.IMREAD_GRAYSCALE)
+
+    # Always update PREV_IMG so state stays aligned
     cv2.imwrite(PREV_IMG, gray)
 
+    # If we're in light cooldown, ignore motion but accept the frame
+    if light_cooldown:
+        log.debug("Ignoring motion due to light cooldown (state synced)")
+        return False
+
     diff = cv2.absdiff(prev, gray)
     mean_diff = np.mean(diff)
 
-    if mean_diff > 75:
+    if mean_diff > 60:
         log.debug("Ignoring global brightness change (mean=%.2f)", mean_diff)
         return False