SECURITY DOOR USING MAGNETIC FIELD

         INTRODUCTION

        The magnetic door security system consists of alarm that will sound whenever someone opened up the door. This can help people inside the house or store premise to be more alert toward people who coming out in their place. This magnetic door security system also has a timer to count the timing for buzzer to stop sound. This magnetic door will reset the system each time the buzzer stop sound. This magnetic door security system uses an electromagnetic circuit to control the system and function it properly. This is the security features to help people to be more alert of the presence of people around.

PROBLEM STATEMENT 

• Lately, lots of newspaper emblazoned news of the invasion and robbery at the store premises and residential areas. 
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• One of the causes of this problem is lack of safety features at that place 

CIRCUIT OPERATION

        This project will applied at the door, which means  if there is someone opens the door, magnetic sensor NC will NO and  buzzer will automatically ON. So we can know that someone is entering our house or shop. In this project we use surface mount magnetic switch as a sensor. The surface mounts magnetic are in normally close type, which means when the magnets are lined up, the switch are close. So in this project when we apart the magnet, means we open the door then the switch will open and allowed the voltage source to the circuit and circuit will function and the buzzer will ON. In this circuit we use timer 555 to set the duration of the buzzer ON. So we do not need to switch of the power in order to off the buzzer.