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easy and cheap project is like if you make some sensors and switches to inputs of micro controllers and put some LEDS and Alarm on output pins. write some code like if any input is high output will go high. mean it work like. if any switch or sensor gives high volt the Alarm or LED will glow. or if you wanna make your project more effective. u can add timer in code.. like it gets off with after some time or it sensor 1 is high and if sensor 2 dosent go high alarm should go high. mainly simple switch detector is cheap and very easy project.

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