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Page 70 - Ai Robogenius
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    maker mission

                                                             Laser Security System

                      Create a laser home security system that triggers an alarm (LED and buzzer) when the laser beam is
                      broken. This system uses a laser pointer and a mirror to simulate how real security systems use infrared
                      (IR) sensors to detect motion.
                      Materials Required:

                         Laser pointer, cardboard box, mirror                     9V battery, LED, buzzer
                         BC 547 transistor, LDR (Light Dependent Resistor)        2.2K ohm resistor, switch, wires

                         Pencil, glue, tape, cutter
                      The steps to create the Laser Security System are:

                        STEP - 1     Take the cardboard box and set it up as the base for the
                                   system.

                                                     STEP - 2    Mount the laser pointer at one corner of the cardboard and
                                                                 place 3 small mirrors at the other corner of the cardboard.

                        STEP - 3    Take the 9V battery, LDR, LED, buzzer, BC 547 transistor, 2.2K
                                    ohm resistor and wires.
                        STEP - 4    Connect  the components  of the  circuit  according  to  the
                                    diagram provided.

                                                     STEP - 5    Paste the circuit onto the cardboard and attach a switch to
                                                                 control when the laser security system is ON or OFF.

                                                     STEP - 6    Adjust the mirror so that it reflects off the mirrors and hits
                                                                 the LDR.

                        STEP - 7    Turn on the switch and activate the laser. A perimeter is formed by the laser beam, which
                                    creates an invisible security boundary.

                      When the laser beam is uninterrupted, the system stays inactive with the LED and buzzer off. If the beam is
                      broken, the LDR detects the light change, activating the transistor to power the LED and buzzer, triggering
                      the alarm for a security breach.

                                     AI RoboGenius - VII
                     68

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