Home security alarm system circuit diagram

Posted on Feb 6, 2014

Have you ever thought aboutimplementing your own home security alarm systems It`s one of the simplest and interesting circuits for electronic beginners. Our new home security equipment uses aLDR (Light Depended Resistor) to detect security problems. Theft attempt and other security threats can be controlled by using this simple circuit to improve

Home security alarm system circuit diagram
Click here to download the full size of the above Circuit.

yoursecurity systems. This is also best suited for school students for their high school science projects. To implement this alarm system for home, you have to provide an optical path (with LASER beams) around your home. The LASER path is made possible with one LASER torch and 3 mirror arrangements which encloses the whole area. Please refer the project arrangement section below to make this optical (light) path. We have explained about home security system in detail with animation/ simulation. Thus the voltage drop across the LDR is also low [V=IR (Ohm`s law)] which is insufficient to turn ON the transistor, so the transistor remains in OFF state. When a person (eg: thief) makes a block to the continuous flow of LASER beam, then the light falling on the LDR gets blocked. Thus its resistance increases to a high value in the order of M © range (According to Ohm`s law V=IR). While resistance increases the voltage drop also increases, when this voltage drop exceeds the cut in voltage of the silicon NPN transistor (0. 6V; BC547), it will turn ON. To realize the concept we are providing animation/ simulation of home security alarm circuit below. For animated demonstration, LED is used instead of buzzer.

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