A study of home security system
Summary :
Table of Contents
- Introduction
- Difference between micro controller and micro processor
- Block diagram and kit diagram
- Micro controller architecture (AT89C52)
- Features of micro controller
- Pin diagram and description
- Port pin alternate functions
- AT89C52 block diagram description
- Oscillator characteristics
- Stepper motor
- Introduction
- Variable reluctance motors
- Unipolar permanent magnet and hybrid motors
- Practical unipolar and variable reluctance drivers
- Bipolar motors and H-bridges
- Practical bipolar drive circuits
- Necessity of regulated power supply
- Conclusion
- Bibliography
Abstract
home security systems provide security from threats such as intruders or thieves, by sounding a siren to grab the attention of the public. Two sensor pairs are placed in the system. Among them one pair of receiver sensors is connected to the entrance of the house and the transmitter is carried by the authorized person. The other sensor pair is placed inside the house. When the authorized person enters the house both the sensors detect the person and don't sound an alarm. When a thief enters the house only one sensor detects the person and sends the signal to the controller. On detecting the signal, it sends an interrupt to sound a siren.
The controller is coded such that whenever the detected signal at the corresponding port enters, the output pin, which is connected to alarm doesn't sound. When a thief enters the house only one sensor detects the person and sends the signal to the controller. On detecting the signal, it sends an interrupt to controller and according to it the siren connected at output pin will sound the alarm. The gate is controlled by using a stepper motor which is connected to one the output ports of the controller through a line driver, L293D. The stepper motor is interfaced such that it opens the gate when there is a detected signal and closes when there is no signal.
The controller is coded such that whenever the detected signal at the corresponding port enters, the output pin, which is connected to alarm doesn't sound. When a thief enters the house only one sensor detects the person and sends the signal to the controller. On detecting the signal, it sends an interrupt to controller and according to it the siren connected at output pin will sound the alarm. The gate is controlled by using a stepper motor which is connected to one the output ports of the controller through a line driver, L293D. The stepper motor is interfaced such that it opens the gate when there is a detected signal and closes when there is no signal.
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