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Unformatted text preview: and where output is the 2’s complement of the input number. Level 3: Challenge Exercise Question II: A burglar alarm is designed so that it senses four input signal lines. Line A is from the secret control switch, line B is from a pressure sensor under a steel safe in a locked closet, line C is from a battery-power clock, and line D is connected to a switch on the locked closet door. The following conditions produce logic 1 voltage on each line. A : The control switch is closed. B : The safe is in its normal position in the closet. C : The clock is between 10:00 and 14:00 hours. D : The closet door is closed. Write the expression for the burglar alarm that produces a logic-1 (rings a bell) when the safe is moved and the control switch is closed, or when the closet is opened after banking hours, or when the closet is opened with the control switch open....
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This note was uploaded on 02/06/2011 for the course EE 2000 taught by Professor Vancwting during the Spring '07 term at City University of Hong Kong.
- Spring '07