A theft alarm system for doors and lockers uses sensors—typically magnetic contact or light-dependent resistors (LDR)—to detect unauthorized opening or vibration, triggering a loud siren and notifications to deter intruders. Door sensors monitor perimeter entry, while locker sensors detect light changes when the container is opened.
Key Components and Meanings:
Theft Alarm System:
A security system designed to detect unauthorized access or movement in a secured area (home, car, or locker), triggering a loud sound and notifying the owner, often via smartphone.
Door Sensor (Contact/Magnetic Sensor):
These consist of two parts—one on the door, one on the frame. When separated (door opens), they break a magnetic circuit, triggering the alarm.
Locker Sensor (Light-Dependent Resistor - LDR):
Primarily used for lockers/safes, these sensors detect light. When the locker is closed, it is dark; when opened, the LDR detects light and triggers an alarm.
Sensor Type:
Magnetic: Used for doors and windows.
Vibration/Shock: Detects physical force against a door or vehicle.
Light-Based: Used in safes/lockers.
Function: When triggered, these sensors send a signal to a central control hub, which activates a siren and can alert users via app, SMS, or GSM.
Common Applications:
Door Alarms: Protect against home, office, or car intrusion.
Locker Alarms: Detect unauthorized access to safes or cabinets.
Perimeter Defense: Used in residential and commercial, doors and windows.