A design of simple hardware circuit with different kind of fire sensors enables every user to use this wireless fire security system. The challenges in designing the nodes with various types of fire sensors are discussed and the methods to overcome design problems are also analyzed. The circuit is interfaced with the different types of sensor to sense different fire sources such as gas leakage, smoke, and heat. The cost, circuit components, design requirements, power requirements of sensor node are minimized. The methods to improve the quality of system to detect fire are analyzed. The system is fully controlled by the PIC microcontroller.