diff --git a/Software/python/hwtest.py b/Software/python/hwtest.py
index 23acfa7..9a03b12 100644
--- a/Software/python/hwtest.py
+++ b/Software/python/hwtest.py
@@ -146,8 +146,13 @@ def update_plots(attrname=None, old=None, new=None):
     global brightness
     global time_data
     global brightness_plot_source
-    brightness_plot_source.data = dict(sensor=brightness_idx, brightness=brightness)
-    time_plot_source.data = dict(t=time_data[:,0], e=time_data[:,1], c=time_data[:,2])
+    global control_thread_run
+    if control_thread_run:
+        brightness_plot_source.data = dict(sensor=brightness_idx, brightness=brightness)
+        time_plot_source.data = dict(t=time_data[:,0], e=time_data[:,1], c=time_data[:,2])
+    else:
+        brightness = np.clip([get_normalized_reflectivity(c) for c in range(8)], 0, 1)
+        brightness_plot_source.data = dict(sensor=brightness_idx, brightness=brightness)
 
 def cal_white(attrname=None, old=None, new=None):
     global white_cal