SECURITY SYSTEM BASED ON MICROCONTROLLER AT89S51

A home security control system that uses a controller AT89S51 microcontroller devices and visual basic as a main controller connected to the detection sensor is a photo transistor sensor. The sensor is for detecting motion in the windows and doors, as well as a PIR motion sensor that compares the change in temperature in the room as due to the presence of human objects. Sensors will send the signal information to be received and processed by microcontroller to be sent to the computer, so the device can perform properly controlling. Processing time is relatively fast, it was considered good by the author. Microcontroller will process all the information signal sent by the sensors which are predetermined location. Then the microcontroller will send information will be processed into a graphical form of visual basic and displays will be processed by the operator, and the computer will control the phone through the interface in this case is the RS-232 to USB. The design of this system we expected to find out quickly our home state even though we are outside the house.