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.
