Arduino is an open source micro controller and has gained humongous popularity in the Recent past. Arduino smart home App is an easy to use application that will allow theUser to switch ON/OFF four devices and control the speed of one ceiling fan the app Throws simple characters on the Bluetooth port of the mobile phone for example ‘A’When the button is pressed for the first time and ‘a’ when button is pressed again.You can switch four devices of your choice and control the speedOf one ceiling fan.