This project is all about controlling appliances via xBee communication in Proteus (a simulation software). Here you can see there is a GAS SENSOR and beside that there is a FLAME SENSOR (the library can be downloaded from and the xBee is connected to Arduino through Tx and Rx pins of Arduino and the lamps and the DC motor are connected to supply voltage through a relay. Each relay has one pin connected to Arduino and the other to ground. If the relay is on, then that component is connected to supply and vice versa.”