diff --git a/WifiControlSensor/config_device.h b/WifiControlSensor/config_device.h
index f12a20f..6e943e1 100644
--- a/WifiControlSensor/config_device.h
+++ b/WifiControlSensor/config_device.h
@@ -54,7 +54,7 @@
 
 // GPIO that can be get by mqtt and http
 // Pin 6 to 11 and 16 can not be used for mqtt
-//#define CONFIG_OBSERVED_GPIO {5}
+#define CONFIG_OBSERVED_GPIO {5}
 
 // GPIO used in PWM
 //#define CONFIG_CONTROLLED_PWM {}