Security alarm systems
Security alarm systems are a part of home automation system. These, alarms system are designed to detect unauthorized entry into a building or area. They consist of an array of sensors, a control panel and alerting system, which are interconnections through wire or wireles Sensors detect intruders by many methods such as monitoring door and window contacts, by passive infrared motion detectors, ultrasound, vibration, electric or magnetic fields, or microwaves. When an intruders are detected system alert by alarm system and/or by phone calls to pre-stored numbers through the control panel.
Some alarm systems serve a single purpose of burglary protection; combination systems provide both fire and intrusion protection. Intrusion alarm systems may also be combined with closed-circuit television surveillance (CCTV) systems to automatically record the activities of intruders, and may interface to access control systems for electrically locked doors. Systems range from small, self-contained noisemakers, to complicated, multiarea systems with computer monitoring and control. It may even include two-way voice which allows communication between the panel and Monitoring station.