The main aim of this project is to design a system to monitor and auto control the parameters using WIFI technology. The purpose of the project is to develop a system which is capable of sensing and automatic controlling of various parameters in any sensitive things and it is useful in avoiding any damage or loss. This is a project based on WIFI and eliminates all cable requirements and it can be installed in very sensitive places. The main devices of this project are microcontroller board with all sensors (temp, LDR, fire etc) and Bluetooth Module. In this project we have developed the WIFI based data logger system using micro controller. In this system we have sensors (temperature, LDR, fire) connected to microcontroller. These sensors will continuously sense the data and gives this information to microcontroller. These values are continuously displayed and transmitted to the android mobile using WIFI module. If the sensor values exceed the threshold limit then the corresponding appliance is turned ON or OFF using android mobile. This is very useful for the applications where data in very important and crucial. Applications of this project are many but few are residential access control, building security system, bank security system, industrial control applications, etc.