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The final result turned out to be the following:Figure3. Our Home Alarm SystemMaterials Used: Cost:PIC16F877A 7$4X4 Keypad 2$JHD 162A LCD 6$6V Alarm Buzzer 0. 5$Key tone Buzzer 0. 5$4 MEGA Crystal Oscillator 5$3 Flashing LEDs 0. 1$18 Pico Capacitors 1$Magnetic Sensor 2$Input VoltageWires 0. 1$Breadboard 3$Total Cost: 27.

If an interior, or exterior, siren goes off, the voice of a live ADT security representative will come over the intercom to ask the homeowners about their safety and confirm that help is on the way from the police.

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An exterior siren goes off outside of the home; however, you can also hear it inside of the home.

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