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Glass Break Detectors: Usually mounted near windows to detect the specific high frequency sound of glass being shattered. They are usually installed on a wall opposite or adjacent to the protected glass and are effective within about 15′ to 25′. Smoke and Heat Detectors: Detect smoke and heat. Chapter II:Our Home Alarm SystemOur Home Alarm System:Our project’s main concern was to build a Home Alarm System using a PIC microcontroller. We started off our project by coding the Keypad, then LCD and the final touch was the sensor. We also added two types of buzzers: one to sound the alarm and the other as a key tone buzzer. 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.

The keypad should be installed next to the entry door because it is programmed with a time lag, to permit you to exit when leaving, and enter on arriving home, without activating the alarm.

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interests abroad justifiable or lawful?Certainly it is both—but then why the controversy among certain groups?The controversy among some constitutionalists and conservative circles is that private security defense contractors take the place of the military and thus put distance between the American public and the continuation of wars abroad, which the public is under the mistaken belief have ended.

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