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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.

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According to author Gordon Campbell, ashington has "always" used contractors in times of war. There are many contemporary issues and potential problems when the U. S. military signs deals with private contractors, as it did in Iraq and is currently doing in Afghanistan. The main issue revolves around the concept of hiring 180,000 private contractors to support and in some cases substitute for U. S.