diff --git a/script/camtool.py b/script/camtool.py
index e3945a7..13d3426 100644
--- a/script/camtool.py
+++ b/script/camtool.py
@@ -45,6 +45,7 @@ class CamTool(DeviceBase):
             self.cam_run.write(1)
         while(timestamp == self.timestamp.read()):
             time.sleep(0.001)
+        self.triggerValueChanged(timestamp, None)
 
     def doUpdate(self):
         self.capture()