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Currently the modern world depends on control systems. Various applications in our surrounding use the concepts of control systems. Such applications include the automatic lifts, robotics, the rocket fire and the space shuttle lifts of to earth, car’s hydraulic pistons and many other real life applications. Our body organs as pancreas which regulates our blood sugar, heart which pumps through all parts of our body and brain which controls electric pulses through our backbone etc. all are natural control systems. So control systems have lot of applications in our life, we are surrounded by modern technologies which based on scientific innovations. One would have heard about an aircraft flying in auto mode, a moving vehicle without operator and an antenna which gives maximum auto signal strength all are the applications of control systems. Control system is a system designed for obtaining required characteristics of a process. For getting desired yield with desired performance many subsystems and processes linked in a control system (Nise, 2000).

An example of control system is shown in Fig. 1. Fig. 1 – Control System. The position of antenna is controlled by using gears and feedback potentiometer. Antenna azimuth is also controlled by using some controllers. We will check response of the system without using any controller. Then, for getting a better response we will use analog PID controller and we will see that response will be better than without controller. Later, we will find the equivalent digital controller using different methode.