Laser Security Alarm
Ages: 10+
A laser-based security system is a type of security alarm that uses laser light and a light sensor. A security system protects our homes, offices, banks, lockers etc. from intrusion and unauthorized access. One of the main components of the security system circuit is LDR or Light Dependent Resistors. It detects light and changes its resistance to send a signal to buzzer and LED. When light hits the LDR, its resistance is very low, but when it’s in the dark or light is interrupted its resistance is very high. The LDR is used in combination with the laser to form the light sensor and source.