Implementation of Control System Based on Parallel Interfacing

Abstract

The fundamental aim of this paper is to design and construct PC based control system. Firstly, the window of this system is designed to display the states of door and window with the setting for start and end time. After setting time, the system reads from three sensors. Three sensors are used to sense the office is under normal or abnormal condition. A password is defense in computer security. When the object is sensed in front of the door during the setting time, the password is requested to open the door. If the password is correct, the door is automatically opened. If not, this circuit outputs a signal to PC saying office is interrupted by some one and the alarm would be rung. When window sensors are motivated in security mode, the alarm is on and the speaker is ringing till the reset command from PC monitor is sent.